COPY: Introduction to Chemistry

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Questions and Answers

What is chemistry mainly concerned with?

  • Studying the behavior of matter (correct)
  • Understanding the universe
  • Describing physical phenomena
  • Classifying materials

What is meant by the term 'matter' in chemistry?

  • Only liquids and gases
  • Only the physical world around us
  • All substances and materials in the universe (correct)
  • Only solid substances

What are the two main aspects of chemistry?

  • Classifying and naming compounds
  • Understanding changes and existence of materials (correct)
  • Measuring and weighing substances
  • Describing and analyzing materials

What is a key characteristic of matter?

<p>Has mass (B)</p> Signup and view all the answers

Why is the small-sized brick lighter than the big-sized brick?

<p>It contains less matter (D)</p> Signup and view all the answers

What happens when two trucks try to cross each other in a narrow lane?

<p>They will collide (C)</p> Signup and view all the answers

What is the property of matter that causes it to remain at rest or in motion?

<p>Inertia (D)</p> Signup and view all the answers

What will happen to a football placed in the center of a playground?

<p>It will remain there unless disturbed by an external force (C)</p> Signup and view all the answers

What is the main difference between mass and weight?

<p>Mass is the amount of matter, while weight is the force of gravity (C)</p> Signup and view all the answers

Why do two stools cannot occupy the same space at the same time?

<p>Because matter occupies space (C)</p> Signup and view all the answers

What is the primary focus of chemistry?

<p>The behavior and properties of matter (A)</p> Signup and view all the answers

What is a fundamental characteristic of all matter?

<p>It has mass (D)</p> Signup and view all the answers

What happens when an external force is applied to an object at rest?

<p>It is disturbed from its position (B)</p> Signup and view all the answers

Why do two objects of different sizes occupy different amounts of space?

<p>The smaller object has less mass (D)</p> Signup and view all the answers

What is the term for the amount of matter in an object?

<p>Mass (B)</p> Signup and view all the answers

What is the property of matter that causes it to resist changes in motion?

<p>Inertia (A)</p> Signup and view all the answers

How do we know that air is matter?

<p>Because it has mass (C)</p> Signup and view all the answers

What is the result of two objects trying to occupy the same space?

<p>They collide (A)</p> Signup and view all the answers

What is the primary way that matter behaves?

<p>It maintains its state of motion (C)</p> Signup and view all the answers

What is the relationship between the amount of matter in an object and its mass?

<p>The amount of matter determines the mass (B)</p> Signup and view all the answers

What is the force that pulls objects towards the Earth's surface?

<p>Gravity (C)</p> Signup and view all the answers

According to the law of conservation of mass, what remains the same during physical and chemical changes?

<p>Total mass of the matter (D)</p> Signup and view all the answers

What is the characteristic of matter that determines its physical behavior?

<p>Movement or motion (C)</p> Signup and view all the answers

What is the evidence that supports the kinetic theory of matter?

<p>The movement of pollen grains in water (A)</p> Signup and view all the answers

What is not considered as matter?

<p>Heat or light (B)</p> Signup and view all the answers

What is the origin of the word 'kinetic'?

<p>Greek word 'Kinos' meaning to move (A)</p> Signup and view all the answers

Why do fruits always fall downwards from the trees?

<p>Because of the force of attraction exerted by the Earth (D)</p> Signup and view all the answers

What is the result of heating tin metal in a flask?

<p>It is converted into tin oxide (D)</p> Signup and view all the answers

Why do solids, liquids, and gases have different properties?

<p>Because of their different movements (D)</p> Signup and view all the answers

What is the characteristic of matter that makes it impossible to be destroyed?

<p>It cannot be destroyed or created (A)</p> Signup and view all the answers

What is the force that attracts objects towards the Earth's surface?

<p>Gravity (B)</p> Signup and view all the answers

What is the term for the amount of matter in an object?

<p>Mass (A)</p> Signup and view all the answers

What is the characteristic of matter that determines its physical behavior?

<p>Motion (D)</p> Signup and view all the answers

What is the result of heating tin metal in a flask?

<p>Its weight remains unchanged (B)</p> Signup and view all the answers

What is the origin of the word 'kinetic'?

<p>From the Greek word 'Kinos' meaning to move (C)</p> Signup and view all the answers

What is the evidence that supports the kinetic theory of matter?

<p>Movement of pollen grains in water (B)</p> Signup and view all the answers

What is not considered as matter?

<p>All of the above (D)</p> Signup and view all the answers

What is the law that states that matter cannot be created or destroyed?

<p>Law of Conservation of Mass (B)</p> Signup and view all the answers

What is the reason why fruits always fall downwards from the trees?

<p>Gravity (C)</p> Signup and view all the answers

What is the characteristic of particles of matter that determines their physical properties?

<p>Motion (B)</p> Signup and view all the answers

What is the term for the zig-zag movement of small particles suspended in a liquid or gas?

<p>Brownian motion (B)</p> Signup and view all the answers

What is the result of an increase in kinetic energy of particles of matter?

<p>All of the above (D)</p> Signup and view all the answers

What is the main conclusion that can be drawn from the existence of Brownian motion?

<p>Matter is made up of tiny particles (B)</p> Signup and view all the answers

What is the term for the theory that describes matter as consisting of atoms, molecules, or ions in constant motion?

<p>Kinetic theory of matter (C)</p> Signup and view all the answers

What is a characteristic of particles of matter in a solid state?

<p>They vibrate about their average position (C)</p> Signup and view all the answers

What is the force that exists between particles of matter in a liquid state?

<p>Intermolecular force (A)</p> Signup and view all the answers

What is the result of particles being in a state of random continuous motion?

<p>They gain kinetic energy (B)</p> Signup and view all the answers

What is the characteristic of particles of matter that determines their physical behavior?

<p>Motion (B)</p> Signup and view all the answers

What is the main postulate of the kinetic theory of matter?

<p>Matter consists of molecules (C)</p> Signup and view all the answers

What is the direction of motion of particles in a gas?

<p>Random and zig-zag (C)</p> Signup and view all the answers

What is the outcome of the collisions between particles in a given substance?

<p>The total energy of the particles remains the same. (B)</p> Signup and view all the answers

What is the force that causes the movement of particles in a given substance?

<p>Intermolecular force (C)</p> Signup and view all the answers

What would happen to the particles if they did not collide elastically?

<p>They would come to rest. (A)</p> Signup and view all the answers

What is the purpose of the starch iodide paper in the experiment?

<p>To detect the presence of iodine particles. (A)</p> Signup and view all the answers

What does the diffusion of iodine particles indicate?

<p>The particles are mobile. (A)</p> Signup and view all the answers

What is the observation that suggests the particles are mobile?

<p>The starch iodide paper turns blue when brought near the test tube. (B)</p> Signup and view all the answers

What is the significance of the intermolecular spaces in a given substance?

<p>It determines the magnitude of the intermolecular force. (B)</p> Signup and view all the answers

What is the result of the experiment with the iodine and starch iodide paper?

<p>The particles are found to be mobile. (B)</p> Signup and view all the answers

What is the characteristic of the collisions between particles in a given substance?

<p>They are elastic. (A)</p> Signup and view all the answers

What is the conclusion that can be drawn from the experiment with the iodine and starch iodide paper?

<p>Particles of matter are always mobile. (B)</p> Signup and view all the answers

What is observed when a starch iodide paper is brought near the mouth of the test tube containing iodine?

<p>The starch iodide paper becomes blue. (A)</p> Signup and view all the answers

Why do salts get dissolved in water easily even when not externally stirred?

<p>Due to the kinetic molecular theory of matter. (B)</p> Signup and view all the answers

What determines the physical behavior of particles of matter in different states?

<p>All of the above. (D)</p> Signup and view all the answers

What is the characteristic of particles in a solid state?

<p>They are closely packed and have fixed positions. (A)</p> Signup and view all the answers

Why do solids have a definite shape and volume?

<p>Due to their strong intermolecular forces. (B)</p> Signup and view all the answers

What is the characteristic of particles in a liquid state?

<p>They are able to move past each other freely. (D)</p> Signup and view all the answers

Why do solids have high density?

<p>Due to their closely packed particles. (D)</p> Signup and view all the answers

What is the characteristic of particles in a gas state?

<p>They are able to move freely and have high energy. (B)</p> Signup and view all the answers

What is the result of the diffusion of iodine particles in the test tube?

<p>The iodine particles spread throughout the test tube. (A)</p> Signup and view all the answers

What is the evidence that supports the kinetic theory of matter?

<p>The experiment with iodine particles in a test tube. (A)</p> Signup and view all the answers

What is the main reason why salt dissolves easily in water?

<p>Because of the kinetic energy of water molecules (B)</p> Signup and view all the answers

What is the characteristic of particles in a solid state?

<p>They are closely packed and have fixed positions (A)</p> Signup and view all the answers

What happens to the iodine particles in the experiment with the starch iodide paper?

<p>They spread throughout the test tube (A)</p> Signup and view all the answers

What is the main difference between the three states of matter?

<p>All of the above (D)</p> Signup and view all the answers

What is the characteristic of particles in a liquid state?

<p>They are widely spaced and have random motion (A)</p> Signup and view all the answers

What is the result of an increase in kinetic energy of particles of matter?

<p>They move faster and spread out (B)</p> Signup and view all the answers

What is the characteristic of particles of matter that determines their physical behavior?

<p>All of the above (D)</p> Signup and view all the answers

What is the main postulate of the kinetic theory of matter?

<p>Matter is made up of atoms, molecules, or ions in constant motion (B)</p> Signup and view all the answers

What is the result of particles being in a state of random continuous motion?

<p>They diffuse and spread out (C)</p> Signup and view all the answers

What is the characteristic of particles in a gas state?

<p>They are widely spaced and have random motion (C)</p> Signup and view all the answers

What is a characteristic of particles in a liquid state?

<p>They are loosely packed and their positions are not fixed (B)</p> Signup and view all the answers

What is the primary difference between a liquid and a gas?

<p>Liquids have a definite volume, while gases do not (C)</p> Signup and view all the answers

What is the reason why liquids cannot be compressed?

<p>Their particles are loosely packed and have freedom of motion (C)</p> Signup and view all the answers

What is the characteristic of particles in a gas state?

<p>They are wide apart and their positions are not fixed (C)</p> Signup and view all the answers

What is the primary difference between the density of a liquid and a gas?

<p>Liquids have a higher density, while gases have a lower density (D)</p> Signup and view all the answers

What is the characteristic of particles in a liquid state that allows them to flow?

<p>They are loosely packed and their positions are not fixed (B)</p> Signup and view all the answers

What is the characteristic of particles in a liquid state?

<p>Particles are loosely packed and their positions are not fixed (B)</p> Signup and view all the answers

What is the main difference between the energy associated with particles in a liquid and a gas?

<p>Particles in a liquid have considerable energy, while in a gas they have maximum energy (A)</p> Signup and view all the answers

What is the characteristic of a liquid in terms of its shape and volume?

<p>A liquid has a definite volume but no definite shape (C)</p> Signup and view all the answers

What is the characteristic of particles in a gas?

<p>Particles are wide apart and their positions are not fixed (C)</p> Signup and view all the answers

What is the characteristic of a gas in terms of its compressibility?

<p>A gas can be compressed and is not rigid (B)</p> Signup and view all the answers

What is the characteristic of a liquid in terms of its density?

<p>A liquid has a relatively high density (D)</p> Signup and view all the answers

What is the reason why a wooden block is considered a solid?

<p>It has a fixed shape and is rigid (A)</p> Signup and view all the answers

Why is a rubber band considered a solid?

<p>It regains its shape when the force is removed (A)</p> Signup and view all the answers

What is a characteristic of molecules in a solid?

<p>They have a strong force of attraction between them (D)</p> Signup and view all the answers

What is a characteristic of molecules in a liquid?

<p>They lie far apart from each other (A)</p> Signup and view all the answers

What happens to the shape of a rubber band when a force is applied?

<p>It undergoes a change in shape (B)</p> Signup and view all the answers

What is a characteristic of molecules in a solid state?

<p>They have a fixed position (D)</p> Signup and view all the answers

What is the reason why a rubber band is considered a solid, despite undergoing a change in shape?

<p>It regains its shape when the force is removed (C)</p> Signup and view all the answers

What is a characteristic of the kinetic model of a solid?

<p>Molecules have a fixed position (A)</p> Signup and view all the answers

What is the primary reason why a rubber band is considered a solid?

<p>It regains its original shape when the force is removed (C)</p> Signup and view all the answers

What is a characteristic of the molecules in a solid?

<p>They are closely packed (C)</p> Signup and view all the answers

What is the main difference between the molecules in a solid and a liquid?

<p>The molecules in a liquid are farther apart than those in a solid (D)</p> Signup and view all the answers

Why is a wooden block considered a solid?

<p>It has a fixed shape and is rigid (A)</p> Signup and view all the answers

What is the characteristic of the molecules in a liquid that allows them to move freely?

<p>The intermolecular force of attraction between the molecules is not strong enough to keep them bonded to one position (B)</p> Signup and view all the answers

What is the main characteristic of a solid?

<p>It has a fixed shape and is rigid (D)</p> Signup and view all the answers

What is the arrangement of molecules in a solid?

<p>They are arranged in a definite manner (A)</p> Signup and view all the answers

What is the primary reason why a solid maintains its shape?

<p>The molecules are fixed in position (D)</p> Signup and view all the answers

What is the force that resists the relative motion of layers in a flowing liquid?

<p>Frictional force (A)</p> Signup and view all the answers

Why does glycerine have a higher viscosity than water or alcohol?

<p>Because of its stronger intermolecular forces (D)</p> Signup and view all the answers

What happens to the viscosity of a liquid when its temperature increases?

<p>It decreases (A)</p> Signup and view all the answers

What is the term for the internal friction or resistance in a flowing liquid?

<p>Viscosity (C)</p> Signup and view all the answers

Which of the following liquids is more viscous?

<p>Honey (A)</p> Signup and view all the answers

What is the result of the relative motion between layers in a flowing liquid?

<p>Increased friction (B)</p> Signup and view all the answers

What is the force responsible for the stationary layer of liquid near a plate?

<p>Friction (C)</p> Signup and view all the answers

What is the relationship between intermolecular forces and viscosity?

<p>Stronger intermolecular forces lead to higher viscosity (B)</p> Signup and view all the answers

What is the effect of increasing temperature on the intermolecular forces in a liquid?

<p>It decreases the intermolecular forces (B)</p> Signup and view all the answers

What is the term for the resistance to flow in a liquid caused by molecular forces?

<p>Viscosity (B)</p> Signup and view all the answers

What is the reason for the surface tension of a liquid?

<p>The intermolecular forces between surface molecules are unbalanced (A)</p> Signup and view all the answers

What happens to the surface tension of a liquid when the temperature is increased?

<p>It decreases (C)</p> Signup and view all the answers

What is the relationship between surface tension and intermolecular attractive forces?

<p>Surface tension is directly proportional to intermolecular forces (D)</p> Signup and view all the answers

What is the characteristic of the layer of liquid in contact with the wall of a tube?

<p>It is stationary (B)</p> Signup and view all the answers

What is the term for the property of a liquid that resists flow?

<p>Viscosity (C)</p> Signup and view all the answers

What is the velocity profile of a liquid flowing through a tube?

<p>Highest in the centre and lowest at the wall (D)</p> Signup and view all the answers

What is the effect of temperature on intermolecular forces in a liquid?

<p>It decreases them (C)</p> Signup and view all the answers

What is the reason for the difference in velocity between the centre and the wall of a tube?

<p>Friction between the liquid and the wall (A)</p> Signup and view all the answers

What is the characteristic of a liquid with high surface tension?

<p>It has strong intermolecular forces (C)</p> Signup and view all the answers

What is the effect of surface tension on the Cleaning ability of a liquid?

<p>It increases the cleaning ability (B)</p> Signup and view all the answers

What is the reason for the surface tension of a liquid?

<p>Because of the attractive forces between molecules (D)</p> Signup and view all the answers

What happens to the surface tension of a liquid when the temperature increases?

<p>It decreases (B)</p> Signup and view all the answers

What is the property of a liquid that is responsible for its ability to flow through a tube?

<p>Viscosity (C)</p> Signup and view all the answers

Why do the molecules at the surface of a liquid experience an unbalanced force?

<p>Because of the attractive forces from molecules below (C)</p> Signup and view all the answers

What is the result of the unbalanced force at the surface of a liquid?

<p>The surface molecules experience a net downward force (D)</p> Signup and view all the answers

What is the effect of temperature on the intermolecular forces between molecules of a liquid?

<p>Intermolecular forces decrease with temperature (B)</p> Signup and view all the answers

What is the relationship between the magnitude of surface tension and intermolecular attractive forces?

<p>The magnitude of surface tension is directly proportional to the intermolecular attractive forces (C)</p> Signup and view all the answers

What is the property of a liquid that determines its ability to resist changes in shape?

<p>Surface tension (D)</p> Signup and view all the answers

What is the direction of motion of the layer of liquid in contact with the wall of a tube?

<p>Stationary (C)</p> Signup and view all the answers

What is the velocity of the liquid in the centre of a tube?

<p>Highest (C)</p> Signup and view all the answers

What is the internal friction or resistance that resists the relative motion of a liquid?

<p>Viscosity (D)</p> Signup and view all the answers

Why does glycerine have more viscosity than water or alcohol?

<p>Due to stronger intermolecular forces (B)</p> Signup and view all the answers

What happens to the viscosity of a liquid when the temperature is increased?

<p>It decreases (A)</p> Signup and view all the answers

What is the reason for the stationary layer in contact with the glass plate in a liquid flowing over it?

<p>Due to adhesion (A)</p> Signup and view all the answers

What is the characteristics of a liquid with high viscosity?

<p>It flows with difficulty (C)</p> Signup and view all the answers

What is the relation between intermolecular forces and viscosity?

<p>Strong intermolecular forces lead to high viscosity (A)</p> Signup and view all the answers

What is the result of the relative motion between different layers of a liquid?

<p>Each layer exerts a drag on the next (D)</p> Signup and view all the answers

What is the reason for the continuous increase in velocity of different layers of a liquid flowing over a glass plate?

<p>Due to relative motion (A)</p> Signup and view all the answers

What is the characteristic of honey that makes it more viscous than water?

<p>Stronger intermolecular forces (A)</p> Signup and view all the answers

What is the result of the work done to maintain the flow of a liquid?

<p>It maintains the flow of the liquid (B)</p> Signup and view all the answers

What is the primary reason for the surface tension of a liquid?

<p>Intermolecular attractive forces (B)</p> Signup and view all the answers

What happens to the surface tension of a liquid when its temperature is increased?

<p>It decreases (B)</p> Signup and view all the answers

What is the relationship between surface tension and the nature of a liquid?

<p>Surface tension is a measure of intermolecular attractive forces (B)</p> Signup and view all the answers

What is the characteristic of liquid flow through a tube?

<p>The layer in contact with the tube is stationary (D)</p> Signup and view all the answers

What is the property of a liquid that causes it to resist changes in shape?

<p>Viscosity (A)</p> Signup and view all the answers

What is the effect of increasing temperature on the viscosity of a liquid?

<p>It decreases the viscosity (B)</p> Signup and view all the answers

What is the relationship between the velocity of liquid layers in a tube?

<p>The velocity of the layers decreases from the center to the wall (D)</p> Signup and view all the answers

What is the force responsible for the surface tension of a liquid?

<p>Intermolecular attractive force (C)</p> Signup and view all the answers

What is the result of the imbalance of forces at the surface of a liquid?

<p>The liquid surface is under tension (C)</p> Signup and view all the answers

Why do clothes get washed more efficiently in hot water?

<p>Because of decreased surface tension (D)</p> Signup and view all the answers

What is the reason for the internal resistance or viscosity in a liquid?

<p>Molecular force working between the molecules of the liquid (C)</p> Signup and view all the answers

What happens to the velocity of different layers of a liquid flowing over a glass plate?

<p>The velocity of different layers increases continuously with the distance from the fixed surface (B)</p> Signup and view all the answers

Why does glycerine have more viscosity than water or alcohol?

<p>Glycerine has a higher intermolecular force (A)</p> Signup and view all the answers

What is the effect of temperature on the viscosity of a liquid?

<p>Viscosity decreases with an increase in temperature (B)</p> Signup and view all the answers

What is the reason for the difference in viscosity between honey and water?

<p>Honey has a stronger intermolecular force (D)</p> Signup and view all the answers

What is the role of each layer in a liquid flowing through a pipe?

<p>Each layer exerts a drag on the next layer (D)</p> Signup and view all the answers

What is the characteristic of a liquid with high viscosity?

<p>It flows slowly and with difficulty (C)</p> Signup and view all the answers

What is the relationship between intermolecular forces and viscosity?

<p>High intermolecular forces result in high viscosity (A)</p> Signup and view all the answers

What is the reason for the difference in flow of glycerine and water?

<p>Glycerine has a higher intermolecular force (A)</p> Signup and view all the answers

What is the characteristic of a liquid with low viscosity?

<p>It flows easily and quickly (C)</p> Signup and view all the answers

What is the state of matter of bromine at a temperature greater than -7.2°C but less than 59°C?

<p>Liquid (B)</p> Signup and view all the answers

What is the primary reason why gases exert pressure?

<p>Due to constant collision and bombardment on the walls of the vessel (A)</p> Signup and view all the answers

What is true about the composition of gases?

<p>They have similar composition in all parts (D)</p> Signup and view all the answers

What is the result of applying pressure and cooling to a gas?

<p>It becomes a liquid (D)</p> Signup and view all the answers

What is the reason why gases fill the entire space of their container?

<p>Due to high kinetic energy and low intermolecular forces (B)</p> Signup and view all the answers

What is the direction of pressure exerted by a gas?

<p>In all directions (A)</p> Signup and view all the answers

What is the term for the movement of particles in a gas?

<p>Diffusion (D)</p> Signup and view all the answers

What is true about the molecules of a gas?

<p>They have high kinetic energy and large intermolecular spaces (C)</p> Signup and view all the answers

What happens when the kinetic energy of particles of matter increases?

<p>They move randomly (A)</p> Signup and view all the answers

What is the term for the theory that describes matter as consisting of atoms, molecules, or ions in constant motion?

<p>Kinetic theory of matter (D)</p> Signup and view all the answers

What is the term for the force that exists between particles of matter in a liquid state?

<p>Intermolecular forces (A)</p> Signup and view all the answers

What is the state of matter of bromine at a temperature greater than -7.2°C but less than 59°C?

<p>Liquid (D)</p> Signup and view all the answers

What is the main reason why gases exert pressure in all directions?

<p>Due to the constant collision of molecules with the container walls (B)</p> Signup and view all the answers

What is the characteristic of gases that allows them to fill completely the vessel they are contained in?

<p>Large intermolecular spaces and high kinetic energy (B)</p> Signup and view all the answers

What is the process by which gases can be converted into liquids?

<p>Liquefaction (A)</p> Signup and view all the answers

What is the characteristic of gases that makes them homogeneous in nature?

<p>Similar composition in all parts (A)</p> Signup and view all the answers

What is the result of the constant collision of gas molecules with the container walls?

<p>The gas exerts pressure on the container walls (B)</p> Signup and view all the answers

What is the primary difference between the movement of gas molecules and liquid molecules?

<p>Gas molecules move faster than liquid molecules (D)</p> Signup and view all the answers

What is the characteristic of a liquid that allows it to take the shape of its container?

<p>Definite volume and no definite shape (A)</p> Signup and view all the answers

What is the result of the high kinetic energy of gas molecules?

<p>The gas molecules spread out and fill the container (B)</p> Signup and view all the answers

What is the characteristic of gases that allows them to exert pressure in all directions?

<p>Negligible force of attraction between molecules (D)</p> Signup and view all the answers

What is the term for the process by which gases intermix with one another without any mechanical aid?

<p>Diffusion (A)</p> Signup and view all the answers

What is the main application of Graham's law of diffusion?

<p>All of the above (D)</p> Signup and view all the answers

What are the three states of matter that are interconvertible?

<p>Solid, liquid, and gas (D)</p> Signup and view all the answers

What is the change in condition necessary for the interconversion of states of matter?

<p>All of the above (D)</p> Signup and view all the answers

What happens when a bottle of ammonia is opened in a laboratory?

<p>Its pungent smell can be experienced all over the laboratory (C)</p> Signup and view all the answers

What is the result of heating ice above 0°C?

<p>It changes into a liquid state (B)</p> Signup and view all the answers

What happens when a candle is lit up?

<p>The wax melts and rises up the wick (B)</p> Signup and view all the answers

What is the process by which gases are separated from a mixture?

<p>Diffusion (C)</p> Signup and view all the answers

What is the result of further heating a liquid above 100°C?

<p>It changes into a gaseous state (C)</p> Signup and view all the answers

What is the characteristic of gases that allows them to intermix with one another?

<p>They are able to form a homogeneous mixture (A)</p> Signup and view all the answers

What is the process of converting gases into liquid state?

<p>By increasing the pressure of the gas (C)</p> Signup and view all the answers

Why does the temperature of the system not change after the melting point is achieved?

<p>Because the heat is used to change the state of the substance (B)</p> Signup and view all the answers

What is the term for the energy required to change a solid into a liquid?

<p>Latent heat (C)</p> Signup and view all the answers

What happens when a substance changes its state?

<p>It can be reverted to its original state by altering its temperature or pressure (A)</p> Signup and view all the answers

Why can sugar not be converted from solid to liquid?

<p>Because it decomposes when heated (D)</p> Signup and view all the answers

What happens when the temperature of a substance is changed?

<p>Its physical state changes (B)</p> Signup and view all the answers

What is the term for the change of state of a substance?

<p>Phase transition (D)</p> Signup and view all the answers

Why is latent heat called 'hidden heat'?

<p>Because it is hidden in the system (C)</p> Signup and view all the answers

What is the result of increasing the pressure of a gas?

<p>The gas becomes a liquid (D)</p> Signup and view all the answers

What is the relationship between the temperature and physical state of a substance?

<p>Temperature determines the physical state (C)</p> Signup and view all the answers

What is the property that allows ammonia to spread its smell all over the laboratory?

<p>Diffusion (C)</p> Signup and view all the answers

According to Graham's law of diffusion, what can be determined?

<p>Relative densities and molecular weights of gases (D)</p> Signup and view all the answers

What is the process of changing a mixture of gases into individual gases?

<p>Separation (A)</p> Signup and view all the answers

What are the three main states of matter?

<p>Solid, Liquid, Gas (D)</p> Signup and view all the answers

What is the term for the process of changing from one state of matter to another?

<p>Interconversion (C)</p> Signup and view all the answers

What is the result of heating ice?

<p>It changes into a liquid state (A)</p> Signup and view all the answers

What is the result of heating water above 100°C?

<p>It changes into a gas state (B)</p> Signup and view all the answers

What happens when a candle is lit?

<p>The wax changes into a liquid state (B)</p> Signup and view all the answers

What is the process by which particles intermix and spread out?

<p>Diffusion (C)</p> Signup and view all the answers

What is the result of decreasing the pressure of a gas?

<p>It remains in a gas state (D)</p> Signup and view all the answers

What is necessary to convert gases such as nitrogen, oxygen, hydrogen, and helium into a liquid state?

<p>Cooling and increasing the pressure of the gas (C)</p> Signup and view all the answers

Why does the temperature of a system not change after the melting point is achieved until all the ice melts?

<p>The heat supplied is used to change the state by breaking the intermolecular forces of attraction (D)</p> Signup and view all the answers

What is the energy required to change a solid into a liquid called?

<p>Latent heat (D)</p> Signup and view all the answers

What happens when a substance changes its state?

<p>It can be reverted to the original state by altering its temperature or pressure (A)</p> Signup and view all the answers

Why can't sugar be changed from a solid to a liquid state?

<p>Because sugar decomposes when heated (D)</p> Signup and view all the answers

What is the term for the temperature at which a substance changes from a solid to a liquid state?

<p>Melting point (C)</p> Signup and view all the answers

What happens when a substance is heated and changes its physical state?

<p>Its physical properties change (D)</p> Signup and view all the answers

What is the result of changing the pressure of a gas?

<p>The gas changes its physical state (A)</p> Signup and view all the answers

Why is it not essential that all substances can be changed from one state to another?

<p>Because some substances decompose when heated (A)</p> Signup and view all the answers

What is the term used to describe the energy required to change a solid into a liquid?

<p>Latent heat of fusion (A)</p> Signup and view all the answers

What is the term used to describe the process of gases intermixing with one another without any mechanical aid?

<p>Diffusion (A)</p> Signup and view all the answers

What is the purpose of Graham's law of diffusion?

<p>To determine the relative densities and molecular weights of gases (C)</p> Signup and view all the answers

What happens to the smell of ammonia when a bottle is opened in one corner of a laboratory?

<p>It can be experienced all over the laboratory (A)</p> Signup and view all the answers

What is the result of heating ice, which is water in a solid state?

<p>It changes into a liquid state (C)</p> Signup and view all the answers

What are the three forms of matter that are interconvertible?

<p>Solid, liquid, and gas (C)</p> Signup and view all the answers

What is the result of further heating the water after it changes into a liquid state?

<p>It changes into a gas state (B)</p> Signup and view all the answers

What happens to the wax in a candle when it is lit up?

<p>It changes into a liquid state (C)</p> Signup and view all the answers

What is the purpose of diffusion in separating gases from a mixture?

<p>To separate gases based on their molecular weights (C)</p> Signup and view all the answers

What is the term used to describe the process of gases spreading and intermixing with one another?

<p>Diffusion (C)</p> Signup and view all the answers

What is the result of repeating the process of diffusion to separate gases from a mixture?

<p>Gases can be completely separated (B)</p> Signup and view all the answers

What is the process of converting gases like nitrogen, oxygen, hydrogen, and helium into a liquid state?

<p>Cooling and increasing pressure (C)</p> Signup and view all the answers

Why does sugar not change into liquid sugar when heated?

<p>Because the sugar changes into a decomposed substance after heating (A)</p> Signup and view all the answers

What is the energy required to change a solid into a liquid called?

<p>Latent heat (A)</p> Signup and view all the answers

What happens to the temperature of a system when it reaches the melting point?

<p>It remains constant until all the ice melts (D)</p> Signup and view all the answers

What is the term for the heat supplied to change the state of a substance?

<p>Latent heat (B)</p> Signup and view all the answers

Why does the heat supplied to a system not change the temperature until all the ice melts?

<p>Because the heat is used to change the state of the system (B)</p> Signup and view all the answers

What is the result of altering the temperature of a substance?

<p>It changes its state (B)</p> Signup and view all the answers

What can cause a gas to change its state?

<p>Changing the pressure (C)</p> Signup and view all the answers

What is the energy required to change a solid into a liquid also known as?

<p>Latent heat (D)</p> Signup and view all the answers

What is the purpose of latent heat in a system?

<p>To change the state of the system (C)</p> Signup and view all the answers

What is the amount of heat energy required to change 1 kg of a solid into a liquid at atmospheric pressure without any change in temperature?

<p>Latent heat of fusion (C)</p> Signup and view all the answers

What happens to the molecules of a solid when it is subjected to heating?

<p>Their kinetic energy increases (B)</p> Signup and view all the answers

What is the term for the temperature at which a solid gets converted to a liquid state at atmospheric pressure?

<p>Melting point (A)</p> Signup and view all the answers

What is the effect of pressure on the melting point of solids that expand on melting?

<p>It increases the melting point (D)</p> Signup and view all the answers

What is the latent heat of fusion of ice?

<p>3.34 x 10^5 J/kg (A)</p> Signup and view all the answers

What is the state of water at 100°C?

<p>Vapour (C)</p> Signup and view all the answers

What is the effect of pressure on the melting point of solids that contract on melting?

<p>It decreases the melting point (C)</p> Signup and view all the answers

What is the change in the molecular arrangement of a solid during melting?

<p>It changes from solid to liquid (C)</p> Signup and view all the answers

What is the type of heat energy required to change 1 kg of a liquid into a vapour at atmospheric pressure without any change in temperature?

<p>Latent heat of vaporization (D)</p> Signup and view all the answers

What is the graph of temperature against time for the change from ice at -15°C to water and further to steam?

<p>A curved line (C)</p> Signup and view all the answers

What is latent heat of fusion?

<p>The amount of heat energy required to change 1 kg of a solid into a liquid at atmospheric pressure (C)</p> Signup and view all the answers

What is the latent heat of fusion of ice?

<p>3.34 x 10^5 J/kg (B)</p> Signup and view all the answers

What happens to the molecules when a solid is heated?

<p>They absorb heat energy and increase their kinetic energy (C)</p> Signup and view all the answers

What is the temperature at which a solid changes to a liquid state at atmospheric pressure?

<p>Melting point (D)</p> Signup and view all the answers

What happens to the melting point of a solid that expands on melting when the pressure is increased?

<p>It increases (C)</p> Signup and view all the answers

What is the effect of pressure on the melting point of paraffin wax?

<p>It increases the melting point (D)</p> Signup and view all the answers

What is the process by which the molecular arrangement of a solid changes to that of a liquid?

<p>Melting (D)</p> Signup and view all the answers

What is the graph of temperature against time for the change from ice to water and further to steam?

<p>A step-wise line (A)</p> Signup and view all the answers

What is the melting point of ice?

<p>0°C (D)</p> Signup and view all the answers

What is the effect of pressure on the melting point of cast iron?

<p>It decreases the melting point (C)</p> Signup and view all the answers

What is the main effect of adding impurities to a solid?

<p>Decrease the melting point of the solid (D)</p> Signup and view all the answers

What is the melting point of Rose's metal?

<p>94.5°C (B)</p> Signup and view all the answers

What is the process of conversion of a liquid state to a solid state called?

<p>Freezing (C)</p> Signup and view all the answers

What is the unique property of ice that makes it less dense than water?

<p>Its molecules form a latticework of hexagons (A)</p> Signup and view all the answers

Why do fish and aquatic animals survive in frozen lakes?

<p>Because ice is less dense than water (D)</p> Signup and view all the answers

What is the freezing point of a liquid?

<p>The temperature at which a liquid converts into a solid at atmospheric pressure (C)</p> Signup and view all the answers

What is the main reason why ice floats on water?

<p>Because ice is less dense than water (C)</p> Signup and view all the answers

What is the density of ice?

<p>0.917 g/cm3 (D)</p> Signup and view all the answers

What is the main problem caused by the expansion of ice on land?

<p>All of the above (D)</p> Signup and view all the answers

What is the percentage of ice that remains below the water's surface?

<p>90% (D)</p> Signup and view all the answers

What is the effect of adding impurities to a solid?

<p>Decrease the melting point of the solid (A)</p> Signup and view all the answers

What is the melting point of Rose's metal?

<p>94.5°C (D)</p> Signup and view all the answers

What is the freezing point of a liquid?

<p>The temperature at which a liquid converts into a solid (C)</p> Signup and view all the answers

Why does ice float on water?

<p>Because it is less dense than water (A)</p> Signup and view all the answers

What is the density of ice?

<p>0.917 g/cm³ (B)</p> Signup and view all the answers

Why can fish survive in frozen lakes?

<p>Because ice is less dense than water (D)</p> Signup and view all the answers

What happens to the volume of water when it freezes?

<p>It increases by 77% (D)</p> Signup and view all the answers

What is the main reason for the weathering of paved surfaces?

<p>The expansion of ice (C)</p> Signup and view all the answers

What is the purpose of freezing mixtures?

<p>To preserve food (B)</p> Signup and view all the answers

What is the composition of a freezing mixture used to produce a lower temperature?

<p>3 parts of ice and 1 part of common salt (D)</p> Signup and view all the answers

What is the process by which a liquid changes into a gaseous state by absorbing heat energy called?

<p>Boiling (B)</p> Signup and view all the answers

What is the quantity of heat in joules required to convert 1 kilogram of a liquid to vapour or gas, without any change in temperature?

<p>Latent heat of vaporization (A)</p> Signup and view all the answers

What is the conversion formula from Celsius to Kelvin scale?

<p>K = °C + 273 (C)</p> Signup and view all the answers

What is the boiling point of a liquid defined as?

<p>The constant temperature at which a liquid rapidly changes into a gaseous state by absorbing heat energy at atmospheric pressure (D)</p> Signup and view all the answers

What is the latent heat of vaporization of water?

<p>22.5 x 10^5 J/kg (A)</p> Signup and view all the answers

What is the conversion formula from Fahrenheit to Celsius scale?

<p>°C = (°F - 32) x 5/9 (B)</p> Signup and view all the answers

What is the temperature at which vapour pressure of a liquid becomes equal to atmospheric pressure?

<p>Boiling point (C)</p> Signup and view all the answers

What is the process by which a liquid changes into a solid state by releasing heat energy called?

<p>Freezing (C)</p> Signup and view all the answers

What is the conversion formula from Kelvin to Celsius scale?

<p>°C = K - 273 (D)</p> Signup and view all the answers

What is the unit of latent heat of vaporization?

<p>J/kg (B)</p> Signup and view all the answers

What is the process called when a liquid changes into a gaseous state by absorbing heat energy?

<p>Boiling (B)</p> Signup and view all the answers

What is the latent heat of vaporization of water?

<p>22.5 x 10^3 J/kg (B)</p> Signup and view all the answers

What is the temperature in Celsius when the temperature in Kelvin is 573 K?

<p>300°C (B), 300°C (C)</p> Signup and view all the answers

What is the formula to convert Fahrenheit to Celsius?

<p>(F - 32) * 5/9 (B)</p> Signup and view all the answers

What is the boiling point of a liquid?

<p>The constant temperature at which the liquid rapidly changes into a gaseous state (D)</p> Signup and view all the answers

What is the relationship between the vapour pressure of a liquid and the atmospheric pressure at the boiling point?

<p>The vapour pressure is equal to the atmospheric pressure (D)</p> Signup and view all the answers

What is the result of converting 108°F to Celsius?

<p>42.2°C (C)</p> Signup and view all the answers

What is the temperature in Kelvin when the temperature in Celsius is 27°C?

<p>300 K (B)</p> Signup and view all the answers

What is the latent heat of vaporization of a liquid?

<p>The quantity of heat required to change the state of a liquid to a gas (D)</p> Signup and view all the answers

What is the correct conversion of 300 K to Celsius?

<p>27°C (B), 27°C (D)</p> Signup and view all the answers

What is the process by which water vapour in the air condenses into dew or frost?

<p>Condensation (B)</p> Signup and view all the answers

What happens when the air becomes saturated with water vapour?

<p>Condensation occurs (D)</p> Signup and view all the answers

What is the term for the temperature at which the air becomes saturated with water vapour?

<p>Dew point (A)</p> Signup and view all the answers

What is the phenomenon by which a substance changes directly from solid to gas without going through the liquid phase?

<p>Sublimation (C)</p> Signup and view all the answers

What type of particles can condensation occur on to form fog or mist?

<p>Dust particles (C)</p> Signup and view all the answers

What is the term for the formation of water droplets in the upper part of the atmosphere?

<p>Clouds (C)</p> Signup and view all the answers

What is an example of a substance that exhibits sublimation?

<p>All of the above (D)</p> Signup and view all the answers

What is the result of the condensation of water vapour on floating dust particles?

<p>Fog or mist (C)</p> Signup and view all the answers

What is the opposite process of condensation?

<p>Evaporation (D)</p> Signup and view all the answers

What is the term for the process by which a liquid changes directly into a gas or vapour?

<p>Evaporation (A)</p> Signup and view all the answers

What happens to the boiling point of a liquid when the external pressure is increased?

<p>It increases (A)</p> Signup and view all the answers

Why does food cook faster in a pressure cooker?

<p>Due to the increase in steam generated (A)</p> Signup and view all the answers

What is the effect of adding impurities to a liquid on its boiling point?

<p>It increases the boiling point (C)</p> Signup and view all the answers

Why does it take longer to cook food in the hills?

<p>Due to the lower atmospheric pressure (D)</p> Signup and view all the answers

What is the process of changing a gas or vapour into a liquid by cooling?

<p>Condensation (B)</p> Signup and view all the answers

What happens to the kinetic energy of particles when a gas or vapour is cooled?

<p>It decreases (A)</p> Signup and view all the answers

What is the result of the attractive forces between particles when a gas or vapour is cooled?

<p>The particles attract each other and condense (B)</p> Signup and view all the answers

Why does water boil at a lower temperature at higher altitudes?

<p>Due to the lower atmospheric pressure (B)</p> Signup and view all the answers

What is the effect of pressure on the boiling point of a liquid?

<p>It increases the boiling point (C)</p> Signup and view all the answers

What is the effect of increasing external pressure on the boiling point of a liquid?

<p>It increases (C)</p> Signup and view all the answers

What happens to the boiling point of a liquid when a solid substance is dissolved in it?

<p>It increases (B)</p> Signup and view all the answers

Why does it take longer to cook food in the hills than in the plains?

<p>Because of low air pressure (A)</p> Signup and view all the answers

What is the process of changing a gas or vapour to a liquid by cooling?

<p>Condensation (A)</p> Signup and view all the answers

At what temperature does water boil at sea level?

<p>373 K (A)</p> Signup and view all the answers

What is the effect of external pressure on the boiling point of a liquid?

<p>It increases the boiling point (A)</p> Signup and view all the answers

What is the result of condensation of water vapor on floating dust particles?

<p>Fog or mist formation (A)</p> Signup and view all the answers

Why does food cook faster in a pressure cooker?

<p>Because of high pressure (B)</p> Signup and view all the answers

What is the term used to describe the temperature at which the air becomes saturated with water vapor?

<p>Dew point (C)</p> Signup and view all the answers

What happens to the kinetic energy of particles when a gas or vapour is cooled?

<p>It decreases (D)</p> Signup and view all the answers

What is the result of the attractive forces between particles in a gas or vapour when it is cooled?

<p>The particles come close together (A)</p> Signup and view all the answers

What is the process by which a substance changes directly from the solid to the gaseous state?

<p>Sublimation (C)</p> Signup and view all the answers

What is an example of a substance that exhibits sublimation?

<p>All of the above (D)</p> Signup and view all the answers

What is the result of condensation of water vapor in the upper part of the atmosphere?

<p>Cloud formation (A)</p> Signup and view all the answers

What is the process by which water in water bodies evaporates during the day?

<p>Evaporation (C)</p> Signup and view all the answers

What happens to the air when the temperature falls during nighttime?

<p>It becomes saturated with water vapor (B)</p> Signup and view all the answers

What is the result of further cooling of the air after it becomes saturated with water vapor?

<p>Dew formation (D)</p> Signup and view all the answers

What is the process by which water droplets condense as dew?

<p>Condensation (A)</p> Signup and view all the answers

What is an example of a situation where condensation occurs?

<p>All of the above (D)</p> Signup and view all the answers

What is the effect of increasing external pressure on the boiling point of a liquid?

<p>It increases the boiling point (C)</p> Signup and view all the answers

Why does food cook faster in a pressure cooker?

<p>Because the steam generated increases the pressure (B)</p> Signup and view all the answers

What happens when a solid substance is dissolved in a liquid?

<p>The boiling point of the liquid increases (D)</p> Signup and view all the answers

What is the process by which water vapor changes directly into a solid state?

<p>Sublimation (B)</p> Signup and view all the answers

Why does it take longer to cook food in the hills than in the plains?

<p>Because the boiling point of the liquid is lower in the hills (A)</p> Signup and view all the answers

What is the term for the temperature at which the air becomes saturated with water vapor?

<p>Dew point (B)</p> Signup and view all the answers

What is the process of changing a gas or vapour to a liquid by cooling?

<p>Condensation (A)</p> Signup and view all the answers

What is the result of the condensation of water vapor on floating dust particles?

<p>Fog or mist formation (C)</p> Signup and view all the answers

What is the state of matter that is characterized by random continuous motion?

<p>Gas (D)</p> Signup and view all the answers

What happens when the kinetic energy of particles decreases?

<p>The particles move slower (A)</p> Signup and view all the answers

What is the effect of increasing the pressure on the boiling point of a liquid at sea level?

<p>The boiling point increases (A)</p> Signup and view all the answers

What is the process by which water in water bodies changes into water vapor?

<p>Evaporation (B)</p> Signup and view all the answers

Why does water boil at a lower temperature in the hills than at sea level?

<p>Because the pressure is less in the hills (D)</p> Signup and view all the answers

What is the result of the condensation of water vapor in the upper part of the atmosphere?

<p>Cloud formation (A)</p> Signup and view all the answers

What is the reason why a pressure cooker can cook food faster than a normal vessel?

<p>Because the steam generated increases the pressure (D)</p> Signup and view all the answers

What is an example of a substance that exhibits sublimation?

<p>Ammonium chloride (C)</p> Signup and view all the answers

What is the state of matter that is characterized by particles that are closely packed and have a fixed shape?

<p>Solid (C)</p> Signup and view all the answers

What is the process by which water vapor changes into a liquid state?

<p>Condensation (A)</p> Signup and view all the answers

What is the result of the condensation of water vapor on a surface?

<p>Dew formation (C)</p> Signup and view all the answers

What happens when carbon dioxide is cooled under high pressure?

<p>It turns directly into dry ice. (D)</p> Signup and view all the answers

Why does dry ice not wet the surface it is kept on?

<p>Because it sublimes. (A)</p> Signup and view all the answers

What is the name under which dry ice is used as a refrigerant?

<p>Dricold (A)</p> Signup and view all the answers

What is the process by which iodine changes directly from a solid to a gas?

<p>Sublimation (A)</p> Signup and view all the answers

What is deposited on the upper part of a test tube when iodine sublimes?

<p>A grey powder (A)</p> Signup and view all the answers

What is the term for a substance that can exist in a gaseous state under specific conditions?

<p>Vapour (C)</p> Signup and view all the answers

What happens to the spaces between gaseous particles when pressure is applied?

<p>They decrease in size. (C)</p> Signup and view all the answers

What happens to a liquefied gas if the pressure is further increased and the temperature is further lowered?

<p>It turns into a solid. (D)</p> Signup and view all the answers

What is the term for the process of a liquid changing into a vapour state even below its boiling point?

<p>Evaporation (D)</p> Signup and view all the answers

Under ordinary circumstances, what state of matter will a substance remain as at room temperature and one atmospheric pressure?

<p>Gas (A)</p> Signup and view all the answers

What is the reason why surface molecules of a liquid possess higher kinetic energies than the molecules in the bulk?

<p>Due to the random motion of the molecules (D)</p> Signup and view all the answers

What happens when the molecules of a liquid break away from the forces of attraction of the other molecules?

<p>They go into vapour state (D)</p> Signup and view all the answers

What is the state of matter that iodine turns into when heated?

<p>Vapour (D)</p> Signup and view all the answers

What is the energy associated with the motion of molecules?

<p>Kinetic energy (A)</p> Signup and view all the answers

What is the process by which a liquid changes into a vapour state?

<p>Vaporization (B)</p> Signup and view all the answers

What is the state of matter that oxygen remains as at room temperature and one atmospheric pressure?

<p>Gas (D)</p> Signup and view all the answers

What is the reason why a substance remains as a gas at room temperature and one atmospheric pressure?

<p>Due to its ordinary circumstances (A)</p> Signup and view all the answers

What happens to solid iodine when it is heated?

<p>It turns into a vapour (A)</p> Signup and view all the answers

What is the process of a liquid changing into a vapour state below its boiling point called?

<p>Evaporation (B)</p> Signup and view all the answers

What is the reason why surface molecules in a liquid can break away and turn into vapour?

<p>They have higher kinetic energies (D)</p> Signup and view all the answers

What remains the same for a substance that exists as a gas under ordinary circumstances?

<p>Its chemical composition (D)</p> Signup and view all the answers

What is the state of a substance that can change into a vapour state even without heat energy?

<p>Liquid (C)</p> Signup and view all the answers

What is the reason why solid carbon dioxide is called dry ice?

<p>It directly gets converted into the gaseous state without passing through the intervening liquid state (B)</p> Signup and view all the answers

What is the force that holds molecules together in a liquid?

<p>Forces of attraction (A)</p> Signup and view all the answers

What is the characteristic of iodine that makes it a sublimable substance?

<p>It changes directly into a gaseous state without first melting (C)</p> Signup and view all the answers

What happens to the kinetic energy of particles in a substance when it is heated?

<p>It increases (D)</p> Signup and view all the answers

What is the effect of applying pressure on gases?

<p>The spaces between the gaseous particles decrease (C)</p> Signup and view all the answers

What is the term for the process of a liquid changing into a gas at its boiling point?

<p>Vaporization (A)</p> Signup and view all the answers

What happens when a liquefied gas is subjected to further increased pressure and lowered temperature?

<p>It changes into a solid state (C)</p> Signup and view all the answers

Why do surface molecules in a liquid have higher kinetic energies?

<p>Because of their random motion (C)</p> Signup and view all the answers

What is the term for a substance that exists in a gaseous state under specific conditions?

<p>Vapour (C)</p> Signup and view all the answers

What is the characteristic of naphthalene balls that makes them useful for preserving clothes?

<p>They change directly into a gaseous state without wetting the clothes (C)</p> Signup and view all the answers

What is the process by which iodine changes directly into a gaseous state when heated?

<p>Sublimation (D)</p> Signup and view all the answers

What is the characteristic of dry ice that makes it different from ordinary ice?

<p>It does not wet the surface on which it is kept (D)</p> Signup and view all the answers

What is the effect of increasing the temperature of a liquid on its rate of evaporation?

<p>It increases the rate of evaporation (C)</p> Signup and view all the answers

Which factor slows down the rate of evaporation?

<p>High humidity (B)</p> Signup and view all the answers

What is the result of the molecules of a liquid absorbing energy from the surroundings during evaporation?

<p>The surroundings lose energy (A)</p> Signup and view all the answers

Why do different liquids have different rates of evaporation?

<p>Due to their different interparticle attractive forces (D)</p> Signup and view all the answers

What happens to the molecules of a liquid when they move from an area of higher pressure to an area of lower pressure?

<p>They are sucked into the surrounding area (A)</p> Signup and view all the answers

What is the result of evaporation on the temperature of the surroundings?

<p>It decreases the temperature (D)</p> Signup and view all the answers

Why does acetone evaporate faster than water?

<p>Due to its weaker interparticle attractive forces (C)</p> Signup and view all the answers

What is the effect of wind speed on the rate of evaporation?

<p>It increases the rate of evaporation (A)</p> Signup and view all the answers

Why do clothes take longer to dry in rainy season?

<p>Due to the higher humidity (A)</p> Signup and view all the answers

What is the effect of increasing the surface area of a liquid on its rate of evaporation?

<p>It increases the rate of evaporation (B)</p> Signup and view all the answers

What happens to the rate of evaporation when the temperature of the liquid is increased?

<p>It increases (B)</p> Signup and view all the answers

Why do wet clothes dry faster in summer than in winter?

<p>Because of the high temperature in summer (C)</p> Signup and view all the answers

What happens to the rate of evaporation when the surface area of the liquid is increased?

<p>It increases (D)</p> Signup and view all the answers

Why does humidity of air lower the rate of evaporation?

<p>Because of the high humidity (B)</p> Signup and view all the answers

What happens to the rate of evaporation when the wind speed is increased?

<p>It increases (B)</p> Signup and view all the answers

What is the effect of pressure on the rate of evaporation?

<p>Decreased pressure increases the rate of evaporation (B)</p> Signup and view all the answers

Why do different liquids have different rates of evaporation?

<p>Because of their different interparticle attractive forces (D)</p> Signup and view all the answers

What is the cooling effect produced due to evaporation?

<p>The liquid molecules absorb energy from the surroundings (C)</p> Signup and view all the answers

What is an example of the cooling effect produced due to evaporation?

<p>The cooling produced when alcohol is poured on the palm (B)</p> Signup and view all the answers

What is the principle behind the cooling effect produced due to evaporation?

<p>The principle of energy absorption from the surroundings (D)</p> Signup and view all the answers

Which factor increases the rate of evaporation of a liquid?

<p>Increase in surface area (A)</p> Signup and view all the answers

What happens to the molecules when the vapour pressure of the surrounding air increases to a specific level?

<p>They evaporate slower (D)</p> Signup and view all the answers

Why do different liquids have different rates of evaporation?

<p>Due to their interparticle attractive forces (D)</p> Signup and view all the answers

What is the result of evaporation on the surroundings?

<p>The surroundings lose energy (D)</p> Signup and view all the answers

Why does acetone evaporate faster than water?

<p>Because acetone has weaker interparticle attractive forces (C)</p> Signup and view all the answers

What is the principle behind the cooling effect produced when alcohol is poured on the palm?

<p>Evaporation (B)</p> Signup and view all the answers

What is the result of decreasing the pressure around a liquid?

<p>The rate of evaporation increases (C)</p> Signup and view all the answers

Why do clothes dry faster in summer than in winter?

<p>Because of the higher temperature in summer (D)</p> Signup and view all the answers

What is the effect of wind speed on the rate of evaporation?

<p>It increases the rate of evaporation (B)</p> Signup and view all the answers

Why do clothes not dry easily in rainy season?

<p>Because of the higher humidity (C)</p> Signup and view all the answers

What determines the colour of plasma glow?

<p>The nature of the gas (B)</p> Signup and view all the answers

What is a Bose-Einstein condensate?

<p>A type of super-cold superfluid (B)</p> Signup and view all the answers

What happens during evaporation?

<p>Only high energy particles leave the liquid surface (D)</p> Signup and view all the answers

What is a characteristic of plasma?

<p>It has neither a definite volume nor a definite shape (B)</p> Signup and view all the answers

What is the temperature at which molecular motion stops?

<p>Absolute zero (0 K) (A)</p> Signup and view all the answers

What happens to atoms when cooled to near absolute zero?

<p>They clump together (D)</p> Signup and view all the answers

What is the result of evaporation on the temperature of the remaining liquid?

<p>It decreases the temperature (A)</p> Signup and view all the answers

Who predicted the Bose-Einstein condensate?

<p>Satyendra Bose and Albert Einstein (D)</p> Signup and view all the answers

What is plasma composed of?

<p>Charged particles (C)</p> Signup and view all the answers

Which of the following is an example of plasma?

<p>A flame (D)</p> Signup and view all the answers

What is the temperature at which the first Bose-Einstein condensate was produced?

<p>170 nK (D)</p> Signup and view all the answers

Why is plasma electrically conductive?

<p>Because it is composed of charged particles (A)</p> Signup and view all the answers

What is the opposite of a super-hot plasma?

<p>A super-cold superfluid (D)</p> Signup and view all the answers

What happens when atoms form a Bose-Einstein condensate?

<p>They form a single entity (C)</p> Signup and view all the answers

What is the correct statement about plasma state?

<p>The particles of plasma state are in the form of ionized gases. (C)</p> Signup and view all the answers

What is the term used to describe plasma?

<p>Ionized gas (B)</p> Signup and view all the answers

What is the result of cooling atoms to near absolute zero?

<p>The atoms become super-unexcited (D)</p> Signup and view all the answers

Who produced the first Bose-Einstein condensate in 1995?

<p>Eric Cornell, Ketterle, and Carl Wieman (B)</p> Signup and view all the answers

Who first identified plasma as 'radiant matter'?

<p>Sir William Crookes (C)</p> Signup and view all the answers

What is the primary factor that determines the colour of a plasma glow?

<p>Temperature and nature of the gas (D)</p> Signup and view all the answers

What is the main reason why evaporation causes cooling?

<p>Low energy particles are left behind (B)</p> Signup and view all the answers

What is the state of matter formed by atoms cooled to a temperature near absolute zero?

<p>Bose-Einstein condensate (D)</p> Signup and view all the answers

What is the correct definition of plasma?

<p>A state of matter that is created by heating and ionizing a gas (D)</p> Signup and view all the answers

What happens to molecular motion at a temperature of zero Kelvin?

<p>It stops (A)</p> Signup and view all the answers

What is the result of atoms clumping together at super low temperatures?

<p>A Bose-Einstein condensate forms (C)</p> Signup and view all the answers

What is the main characteristic of plasma that distinguishes it from a gas?

<p>It is electrically conductive (A)</p> Signup and view all the answers

What is the characteristic of atoms in a Bose-Einstein condensate?

<p>Super unexcited and super cold (A)</p> Signup and view all the answers

Which of the following is an example of plasma?

<p>Flame and lightning (B)</p> Signup and view all the answers

What is the temperature at which the first Bose-Einstein condensate was produced?

<p>170 nanokelvins (C)</p> Signup and view all the answers

What is the correct statement about the particles in plasma?

<p>They are charged and respond strongly to electromagnetic fields (D)</p> Signup and view all the answers

Who predicted the existence of Bose-Einstein condensate in the 1920s?

<p>Satyendra Bose and Albert Einstein (B)</p> Signup and view all the answers

What is the term used to describe plasma?

<p>Ionized gas (C)</p> Signup and view all the answers

What is the main reason why plasma is electrically conductive?

<p>Because it consists of charged particles (C)</p> Signup and view all the answers

What is the opposite of super-hot and super excited atoms?

<p>Super unexcited and super cold atoms (C)</p> Signup and view all the answers

What happens when atoms take up the same place in a Bose-Einstein condensate?

<p>They become a single entity (C)</p> Signup and view all the answers

Which of the following statements about plasma is false?

<p>Plasma has a definite volume and shape (D)</p> Signup and view all the answers

What is the state of matter characterized by atoms being in a state of random continuous motion?

<p>Gas (A)</p> Signup and view all the answers

What is the correct statement about evaporation and cooling?

<p>Evaporation causes cooling (C)</p> Signup and view all the answers

What is the composition of a mixture?

<p>Variable (A)</p> Signup and view all the answers

What happens when common salt is dissolved in water?

<p>A mixture is formed (A)</p> Signup and view all the answers

What is a characteristic of a mixture?

<p>It does not have a fixed melting or boiling point (B)</p> Signup and view all the answers

What is steel used to make?

<p>Rust-free, unbreakable utensils (B)</p> Signup and view all the answers

What is bone an example of?

<p>A composite material (D)</p> Signup and view all the answers

What is wood composed of?

<p>Cellulose mixed with lignin (B)</p> Signup and view all the answers

What is a composite material?

<p>A material that combines the properties of two constituents (D)</p> Signup and view all the answers

What is the purpose of creating composite materials?

<p>To get the exact properties needed for a particular job (C)</p> Signup and view all the answers

What is the characteristic of a mixture that makes it different from a pure substance?

<p>It does not have a fixed composition (A)</p> Signup and view all the answers

What is the fundamental characteristic of a pure substance?

<p>It is uniform or homogeneous throughout. (D)</p> Signup and view all the answers

What is the difference between an element and a compound?

<p>An element is made up of only one kind of atom, while a compound is made up of only one kind of molecule. (B)</p> Signup and view all the answers

What is a characteristic of particles in a pure substance?

<p>They are similar to one another. (C)</p> Signup and view all the answers

What is a mixture?

<p>A material that contains two or more different kinds of particles which do not react chemically but are physically mixed in any proportion. (B)</p> Signup and view all the answers

What is the characteristic of a pure substance that makes it impossible to be separated into simpler particles?

<p>It cannot be separated into simpler particles by physical processes. (B)</p> Signup and view all the answers

What is the term for the components or constituents of a mixture?

<p>Pure substances (B)</p> Signup and view all the answers

What is the difference between a pure substance and a mixture?

<p>A pure substance is made up of only one kind of particles, while a mixture is made up of two or more different kinds of particles. (A)</p> Signup and view all the answers

What is the characteristic of water that makes it a pure substance?

<p>It has uniform composition throughout. (A)</p> Signup and view all the answers

What is the characteristic of a mixture?

<p>It has a variable composition (C)</p> Signup and view all the answers

What is a characteristic of a composite material?

<p>It combines the properties of two constituents (B)</p> Signup and view all the answers

What is steel used to make?

<p>Rust-free utensils (D)</p> Signup and view all the answers

What is bone composed of?

<p>Cellulose and lignin (A)</p> Signup and view all the answers

What is wood composed of?

<p>Cellulose and lignin (D)</p> Signup and view all the answers

What is the difference between a mixture and a composite material?

<p>A mixture has a variable composition, while a composite material has a fixed composition (A)</p> Signup and view all the answers

What is a characteristic of a pure substance?

<p>It has a fixed melting point (B)</p> Signup and view all the answers

What is an example of a composite material?

<p>All of the above (D)</p> Signup and view all the answers

What is the main difference between a mixture and a composite material?

<p>A mixture has a variable composition, while a composite material has a fixed composition (D)</p> Signup and view all the answers

What is the characteristic of a pure substance?

<p>It is uniform or homogenous throughout. (D)</p> Signup and view all the answers

What is the difference between an element and a compound?

<p>An element is made up of atoms, while a compound is made up of molecules. (D)</p> Signup and view all the answers

What is the characteristic of particles in a pure substance?

<p>They are similar to one another. (C)</p> Signup and view all the answers

What is a mixture?

<p>A material that contains two or more different kinds of particles. (D)</p> Signup and view all the answers

What is the characteristic of a pure substance in terms of its composition?

<p>It has a uniform composition. (A)</p> Signup and view all the answers

What is the main difference between a pure substance and a mixture?

<p>A pure substance is uniform or homogenous, while a mixture is physically mixed. (C)</p> Signup and view all the answers

What is an example of a pure substance?

<p>Water. (D)</p> Signup and view all the answers

What is the term for the components of a mixture?

<p>Constituents. (A)</p> Signup and view all the answers

What is the characteristic of a pure substance?

<p>It is uniform or homogenous throughout (C)</p> Signup and view all the answers

What is an element?

<p>A pure substance made up of only one kind of atom (C)</p> Signup and view all the answers

What is a characteristic of particles in a pure substance?

<p>They are similar to one another (A)</p> Signup and view all the answers

What is the term for the components of a mixture?

<p>Constituents (B)</p> Signup and view all the answers

What is a characteristic of a mixture?

<p>It contains two or more different kinds of particles (C)</p> Signup and view all the answers

What is the difference between an element and a compound?

<p>An element is made up of only one kind of atom, while a compound is made up of only one kind of molecule (D)</p> Signup and view all the answers

Why is water considered a pure substance?

<p>Because it has uniform composition throughout (B)</p> Signup and view all the answers

What is not a characteristic of a mixture?

<p>It is uniform or homogenous throughout (B)</p> Signup and view all the answers

What is the definition of a mixture?

<p>A substance with a variable composition (C)</p> Signup and view all the answers

What is a characteristic of a mixture?

<p>It has a variable composition (B)</p> Signup and view all the answers

What is a composite material?

<p>A material that combines the properties of two constituents (A)</p> Signup and view all the answers

What is steel used to make?

<p>Unbreakable utensils (A)</p> Signup and view all the answers

What is bone an example of?

<p>A composite material (A)</p> Signup and view all the answers

What is wood composed of?

<p>Cellulose mixed with lignin (B)</p> Signup and view all the answers

What is the difference between a mixture and a pure substance?

<p>A mixture has a variable composition, while a pure substance has a fixed composition (D)</p> Signup and view all the answers

What is a characteristic of a composite material?

<p>It combines the properties of two or more constituents (B)</p> Signup and view all the answers

What is the primary reason for creating a composite material?

<p>To achieve specific properties needed for a particular job (A)</p> Signup and view all the answers

What was Antoine Lavoisier's contribution to the field of chemistry?

<p>He gave a useful definition of an element (B)</p> Signup and view all the answers

What is the modern definition of an element?

<p>A pure substance that contains only one kind of atoms (A)</p> Signup and view all the answers

How many elements have been discovered so far?

<p>118 (A)</p> Signup and view all the answers

What is the state of matter of most elements at room temperature?

<p>Solid (D)</p> Signup and view all the answers

Which two elements are known to exist in the liquid state at room temperature?

<p>Mercury and bromine (A)</p> Signup and view all the answers

What is the characteristic of atoms of the same element?

<p>They are identical in all respects (D)</p> Signup and view all the answers

Why was Antoine Lavoisier's definition of an element not considered absolutely correct?

<p>Elements can be broken into simpler substances and synthesized from other elements (D)</p> Signup and view all the answers

What is the main difference between atoms of different elements?

<p>They have different sizes and masses (C)</p> Signup and view all the answers

What is the temperature at which gallium and caesium become liquid?

<p>Slightly above room temperature (C)</p> Signup and view all the answers

Which of the following elements are gaseous at room temperature?

<p>All of the above (C)</p> Signup and view all the answers

What is a characteristic of metals?

<p>They are malleable and can be formed into thin sheets (D)</p> Signup and view all the answers

Which of the following metals are the most malleable?

<p>Gold and silver (D)</p> Signup and view all the answers

How many types of elements are classified based on physical properties?

<p>3 (D)</p> Signup and view all the answers

What is a characteristic of non-metals?

<p>They are brittle and do not conduct electricity (C)</p> Signup and view all the answers

Which of the following elements is not a metal?

<p>Fluorine (C)</p> Signup and view all the answers

What is the classification of elements based on physical properties?

<p>Metals, non-metals, and metalloids (C)</p> Signup and view all the answers

What is unique about the properties of gallium and caesium?

<p>They both become liquid at a relatively low temperature (D)</p> Signup and view all the answers

Who is credited with giving a useful definition of an element?

<p>Antoine Laurent Lavoisier (A)</p> Signup and view all the answers

What is the current definition of an element?

<p>A pure substance that contains only one kind of atoms (B)</p> Signup and view all the answers

How many elements have been discovered so far?

<p>118 (B)</p> Signup and view all the answers

What is the state of majority of the elements at room temperature?

<p>Solid (B)</p> Signup and view all the answers

Which two elements are known to exist in the liquid state at room temperature?

<p>Mercury and bromine (A)</p> Signup and view all the answers

What is the characteristic of atoms of the same element?

<p>They are identical in all respects, size, mass, and composition (D)</p> Signup and view all the answers

What was the limitation of the original definition of an element given by Antoine Laurent Lavoisier?

<p>It was proved wrong by the discovery of radioactivity (C)</p> Signup and view all the answers

Who was the first scientist to use the term 'element'?

<p>Robert Boyle (B)</p> Signup and view all the answers

At what temperature do gallium and caesium become liquid?

<p>Slightly above room temperature (303 K) (D)</p> Signup and view all the answers

What are the three types of elements classified based on physical properties?

<p>Metals, Non-metals, and Metalloids (C)</p> Signup and view all the answers

What is malleability a characteristic of?

<p>Metals (A)</p> Signup and view all the answers

Which of the following elements are the most malleable?

<p>Gold and Silver (A)</p> Signup and view all the answers

How many elements are gaseous at room temperature?

<p>11 (A)</p> Signup and view all the answers

What are the names of the two most malleable metals?

<p>Silver and Gold (C)</p> Signup and view all the answers

What is the characteristic of metals that means they can be hammered or beaten into thin sheets?

<p>Malleability (C)</p> Signup and view all the answers

What type of elements are hydrogen, oxygen, and nitrogen?

<p>Gases (D)</p> Signup and view all the answers

Which of the following elements are NOT gaseous at room temperature?

<p>Gold and Silver (B)</p> Signup and view all the answers

What is the primary use of silver foil?

<p>For decorating sweets (A)</p> Signup and view all the answers

What does the ductility of metals mean?

<p>Metals can be drawn or stretched into thin wires (C)</p> Signup and view all the answers

Which metal is the best conductor of electricity?

<p>Silver (A)</p> Signup and view all the answers

What is the characteristic of metals that makes them good reflectors?

<p>Their shining surface (B)</p> Signup and view all the answers

Why are metals like sodium and potassium soft?

<p>Because they are naturally soft (C)</p> Signup and view all the answers

What is the characteristic of metals that makes them hold large weights without breaking?

<p>Their high tensile strength (B)</p> Signup and view all the answers

What is the use of aluminium foils in packaging?

<p>For wrapping medicines and food items (A)</p> Signup and view all the answers

What is the characteristic of metals that makes them good conductors of heat?

<p>Their high thermal conductivity (A)</p> Signup and view all the answers

Which metal is the poorest conductor of heat?

<p>Lead (D)</p> Signup and view all the answers

Why are metals like gold and silver used for making jewellery?

<p>Because they are ductile and lustrous (A)</p> Signup and view all the answers

What is a characteristic of metals?

<p>Having a high tensile strength (A)</p> Signup and view all the answers

Which of the following metals is not strong?

<p>Sodium (B)</p> Signup and view all the answers

What is a common use of metals due to their sonorous property?

<p>Making musical instruments (C)</p> Signup and view all the answers

What is a characteristic of non-metals?

<p>Being brittle and breaking easily (D)</p> Signup and view all the answers

Which of the following non-metals is a good conductor of heat and electricity?

<p>Graphite (A)</p> Signup and view all the answers

What is a common characteristic of metals?

<p>Having a high density (B)</p> Signup and view all the answers

Which of the following metals is a liquid at room temperature?

<p>Mercury (D)</p> Signup and view all the answers

What is a characteristic of non-metals that makes them useful as insulators?

<p>Their ability to resist heat and electricity (C)</p> Signup and view all the answers

What is the general trend in the melting and boiling points of metals?

<p>They are generally high (A)</p> Signup and view all the answers

What is a characteristic of metals that makes them suitable for construction?

<p>Their high tensile strength (C)</p> Signup and view all the answers

What is a characteristic of metals?

<p>Being sonorous (B)</p> Signup and view all the answers

What is true about sodium and potassium metals?

<p>They are not strong and have low tensile strength (C)</p> Signup and view all the answers

What is a characteristic of non-metals?

<p>Being bad conductors of heat and electricity (C)</p> Signup and view all the answers

What is graphite used for?

<p>Making electrodes of batteries and dry cells (A)</p> Signup and view all the answers

What is true about mercury?

<p>It is a liquid at room temperature (B)</p> Signup and view all the answers

What is a characteristic of metals?

<p>Having high densities (A)</p> Signup and view all the answers

What is a characteristic of non-metals?

<p>Being soft (D)</p> Signup and view all the answers

What is a characteristic of gallium and caesium?

<p>They become liquid at a temperature slightly above room temperature (C)</p> Signup and view all the answers

What is an exception to non-metals being bad conductors of heat and electricity?

<p>All of the above (D)</p> Signup and view all the answers

What is steel?

<p>An alloy of iron and carbon (C)</p> Signup and view all the answers

What is the primary use of silver foil?

<p>For decorating sweets (A)</p> Signup and view all the answers

Which metal can be drawn into a wire of about 2 kilometre length with just 1 gram of it?

<p>Gold (C)</p> Signup and view all the answers

What is the best conductor of heat among metals?

<p>Silver (B)</p> Signup and view all the answers

Which metal is an excellent reflector of light and is used for silvering of mirrors?

<p>Silver (B)</p> Signup and view all the answers

What is the property of metals that allows them to hold large weights without breaking?

<p>High tensile strength (A)</p> Signup and view all the answers

Which metal is the poorest conductor of heat?

<p>Lead (C)</p> Signup and view all the answers

What is the characteristic of metals that allows them to be shaped into thin wires or sheets?

<p>Ductility (A)</p> Signup and view all the answers

Which metal is the best conductor of electricity?

<p>Silver (B)</p> Signup and view all the answers

What is the general characteristic of metals regarding their hardness?

<p>They are generally hard, but some are soft (B)</p> Signup and view all the answers

Which metal is used for making milk bottle caps?

<p>Aluminium (B)</p> Signup and view all the answers

What is the characteristic of non-metals that makes them different from metals?

<p>They have low tensile strength and are not sonorous (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of non-metals?

<p>They are good conductors of electricity (D)</p> Signup and view all the answers

What is the term for elements that have properties in between those of metals and non-metals?

<p>Metalloids (C)</p> Signup and view all the answers

What is the definition of a compound?

<p>A pure substance made up of two or more elements chemically combined in a fixed proportion by mass (A)</p> Signup and view all the answers

What is the state of matter of bromine at room temperature?

<p>Liquid (D)</p> Signup and view all the answers

What is the hardest natural substance known?

<p>Diamond (B)</p> Signup and view all the answers

What is the characteristic of metalloids that makes them different from metals and non-metals?

<p>They are brittle like non-metals (A)</p> Signup and view all the answers

What is the characteristic of non-metals that makes them different from metals in terms of their physical states?

<p>They exist in all three states of matter (D)</p> Signup and view all the answers

What is the characteristic of solid non-metals, except for boron, graphite, and diamond?

<p>They have low melting and boiling points (D)</p> Signup and view all the answers

What is the characteristic of non-metals in terms of their density?

<p>They have low densities (B)</p> Signup and view all the answers

What is a characteristic of a compound?

<p>It is made up of different elements combined in a fixed proportion by mass. (A)</p> Signup and view all the answers

What is necessary for a compound to be formed?

<p>A chemical reaction between elements. (B)</p> Signup and view all the answers

What is unique about the properties of a compound?

<p>They are entirely different from those of its constituent elements. (C)</p> Signup and view all the answers

What is an example of a compound?

<p>Iron sulphide. (B)</p> Signup and view all the answers

What happens when iron sulphide reacts with dilute sulphuric acid?

<p>Hydrogen sulphide gas is formed. (C)</p> Signup and view all the answers

What is the difference between iron sulphide and its constituent elements?

<p>Iron sulphide has different properties from iron and sulphur. (D)</p> Signup and view all the answers

What is the result of heating a mixture of iron and sulphur?

<p>A chemical reaction occurs, forming iron sulphide. (D)</p> Signup and view all the answers

What is a characteristic of a chemical compound?

<p>It is formed by a chemical reaction. (B)</p> Signup and view all the answers

What is the difference between a mixture and a compound?

<p>A compound has properties that are different from its constituent elements. (C)</p> Signup and view all the answers

What is an example of a chemical compound that is commonly used?

<p>All of the above. (D)</p> Signup and view all the answers

What is the primary condition for the formation of water from hydrogen and oxygen?

<p>Passing an electric spark through the mixture (A)</p> Signup and view all the answers

What is a characteristic of a compound that distinguishes it from its constituent elements?

<p>It has different properties from its constituent elements (D)</p> Signup and view all the answers

What is the process by which a compound can be separated into its constituent elements?

<p>Electrolysis (C)</p> Signup and view all the answers

What is a characteristic of a compound that makes it a homogeneous substance?

<p>It has the same properties throughout (D)</p> Signup and view all the answers

What is a criterion of purity of a solid compound?

<p>It has a sharp melting point (A)</p> Signup and view all the answers

What is a characteristic of a compound that is involved in its formation?

<p>A chemical bond is formed (A)</p> Signup and view all the answers

What is the result of impurities in a solid compound?

<p>The melting point is decreased (A)</p> Signup and view all the answers

What is a characteristic of a compound that is evident in its physical properties?

<p>It has a fixed melting point (B)</p> Signup and view all the answers

What is the result of electrolysis of a compound?

<p>The compound is separated into its constituent elements (A)</p> Signup and view all the answers

What is a characteristic of a compound that distinguishes it from a mixture?

<p>It is a homogeneous substance (B)</p> Signup and view all the answers

What is the boiling point of pure water at one atmosphere pressure?

<p>100'C (373K) (B)</p> Signup and view all the answers

Why is ocean water not drinkable and cannot be used for crop irrigation?

<p>It contains a large number of dissolved compounds (D)</p> Signup and view all the answers

What is the characteristic of a homogeneous mixture?

<p>It has a uniform composition throughout (D)</p> Signup and view all the answers

What is an example of a heterogeneous mixture?

<p>Milk (A)</p> Signup and view all the answers

What is the term for a mixture of two or more metals in the solid phase?

<p>Alloy (A)</p> Signup and view all the answers

What is the characteristic of the components of a heterogeneous mixture?

<p>They are visible to the naked eye or under a microscope (D)</p> Signup and view all the answers

Why is sea water's boiling point higher than 100'C (373K)?

<p>It contains several dissolved salts (A)</p> Signup and view all the answers

What is the characteristic of all homogeneous mixtures?

<p>They have a uniform composition throughout (A)</p> Signup and view all the answers

What is the difference between a homogeneous mixture and a heterogeneous mixture?

<p>The composition of the mixture (C)</p> Signup and view all the answers

What is an example of a homogeneous mixture in the solid phase?

<p>Alloys (D)</p> Signup and view all the answers

What happens when hydrogen and oxygen are simply mixed?

<p>No reaction occurs (D)</p> Signup and view all the answers

What is a characteristic of a compound?

<p>It has a fixed melting point and boiling point (A)</p> Signup and view all the answers

Why does water extinguish fire?

<p>Because it is neither combustible nor a supporter of combustion (A)</p> Signup and view all the answers

How can a compound be separated into its constituents?

<p>By chemical means, such as electrolysis (C)</p> Signup and view all the answers

What is a characteristic of a pure solid compound?

<p>It has a sharp melting point (C)</p> Signup and view all the answers

What is required for elements to become a compound?

<p>A chemical bond between the atoms of elements (D)</p> Signup and view all the answers

What is a characteristic of a liquid compound?

<p>It has a fixed boiling point (C)</p> Signup and view all the answers

What is the main reason why the boiling point of sea water is higher than that of pure water?

<p>Because sea water contains dissolved salts and other impurities (B)</p> Signup and view all the answers

What is the result of chemical bonding between elements?

<p>A compound with properties different from its constituents (A)</p> Signup and view all the answers

What is a characteristic of a compound?

<p>It is a homogeneous substance (B)</p> Signup and view all the answers

What is the term used to describe a mixture that has a uniform composition throughout?

<p>Homogeneous mixture (A)</p> Signup and view all the answers

What is the result of energy being evolved or absorbed during the formation of a compound?

<p>A chemical bond between the atoms of elements (C)</p> Signup and view all the answers

What is the term used to describe a mixture that does not have a uniform composition throughout?

<p>Heterogeneous mixture (B)</p> Signup and view all the answers

What is an example of a homogeneous mixture in the solid phase?

<p>All of the above (D)</p> Signup and view all the answers

Why is ocean water not suitable for drinking or irrigation?

<p>Because it contains dissolved salts and other impurities (B)</p> Signup and view all the answers

What is the term used to describe a mixture of two or more miscible liquids?

<p>Homogeneous mixture (B)</p> Signup and view all the answers

Why is rainwater considered a pure substance?

<p>Because it contains dissolved gases from the air (A)</p> Signup and view all the answers

What is the term used to describe a mixture of two or more metals?

<p>Alloy (D)</p> Signup and view all the answers

Why do homogeneous mixtures have a uniform composition throughout?

<p>Because they have a single phase (A)</p> Signup and view all the answers

What is the main difference between homogeneous and heterogeneous mixtures?

<p>Their composition throughout (A)</p> Signup and view all the answers

What is the main distinction between a pure substance and a mixture?

<p>A pure substance has a fixed composition, while a mixture does not. (A)</p> Signup and view all the answers

What is an example of a heterogeneous mixture?

<p>A mixture of salt and sand (B)</p> Signup and view all the answers

Why is a salt solution considered a mixture?

<p>Because its constituents can be separated by physical processes (C)</p> Signup and view all the answers

What is a characteristic of a mixture?

<p>Its composition can vary (B)</p> Signup and view all the answers

Why is helium considered a pure substance?

<p>Because it is an element (B)</p> Signup and view all the answers

What is an example of a container filled with a pure substance rather than with a mixture?

<p>A balloon filled with helium (B)</p> Signup and view all the answers

Why is a salt solution homogeneous?

<p>Because it appears uniform (D)</p> Signup and view all the answers

What is a characteristic of a compound?

<p>It has a fixed composition (D)</p> Signup and view all the answers

Why can a mixture be separated by physical processes?

<p>Because its constituents are separable by physical processes (C)</p> Signup and view all the answers

What is a difference between a mixture and a compound?

<p>A mixture has a variable composition, while a compound has a fixed composition (A)</p> Signup and view all the answers

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