Podcast
Questions and Answers
What is Chemistry?
What is Chemistry?
Chemistry is the study of matter and the changes it undergoes.
Define matter.
Define matter.
Matter is anything that has mass and takes up space.
Which of the following is NOT a qualitative property?
Which of the following is NOT a qualitative property?
- Touch
- Taste
- Temperature (correct)
- Smell
What is the difference between a qualitative and a quantitative property?
What is the difference between a qualitative and a quantitative property?
Which property describes the ability of a solid to be hammered or bent into different shapes?
Which property describes the ability of a solid to be hammered or bent into different shapes?
Which property describes the ability of a solid to be pulled into wires?
Which property describes the ability of a solid to be pulled into wires?
The melting point of a substance is a quantitative property.
The melting point of a substance is a quantitative property.
Which of the following is NOT a physical property?
Which of the following is NOT a physical property?
Which property describes the resistance of a solid to being scratched or dented?
Which property describes the resistance of a solid to being scratched or dented?
A physical change always results in the formation of new substances.
A physical change always results in the formation of new substances.
Which of the following is an example of a physical change?
Which of the following is an example of a physical change?
A chemical change can always be reversed.
A chemical change can always be reversed.
Combustibility is an example of a chemical property.
Combustibility is an example of a chemical property.
What are the five clues that indicate a chemical change has occurred?
What are the five clues that indicate a chemical change has occurred?
Chopping a pumpkin into smaller pieces is an example of a chemical change.
Chopping a pumpkin into smaller pieces is an example of a chemical change.
Food composting is a physical change, and no new substances are made.
Food composting is a physical change, and no new substances are made.
Which of the following is an example of a mixture?
Which of the following is an example of a mixture?
A solution is a type of heterogeneous mixture.
A solution is a type of heterogeneous mixture.
What are the two types of mixtures?
What are the two types of mixtures?
Which type of mixture involves more than one particle being visible?
Which type of mixture involves more than one particle being visible?
What type of mixture is cereal with milk?
What type of mixture is cereal with milk?
What type of mixture is saltwater?
What type of mixture is saltwater?
The Particle Theory of Matter states that all matter is made up of tiny particles.
The Particle Theory of Matter states that all matter is made up of tiny particles.
The Particle Theory of Matter states that the particles of a substance move slower as the temperature increases.
The Particle Theory of Matter states that the particles of a substance move slower as the temperature increases.
The Particle Theory of Matter states that particles attract each other and that the greater the distance between particles, the stronger the attraction.
The Particle Theory of Matter states that particles attract each other and that the greater the distance between particles, the stronger the attraction.
Which of the following is NOT a postulate of the Particle Theory of Matter?
Which of the following is NOT a postulate of the Particle Theory of Matter?
How is a compound different from an element?
How is a compound different from an element?
What is a pure substance?
What is a pure substance?
A mixture contains more than one type of particle.
A mixture contains more than one type of particle.
Which of the following is an example of a mechanical mixture?
Which of the following is an example of a mechanical mixture?
A solution mixture is a heterogeneous mixture, meaning that the components are evenly distributed throughout and appear uniform.
A solution mixture is a heterogeneous mixture, meaning that the components are evenly distributed throughout and appear uniform.
Which of the following is NOT an example of a solution mixture?
Which of the following is NOT an example of a solution mixture?
What is the main difference between a mechanical mixture and a solution mixture?
What is the main difference between a mechanical mixture and a solution mixture?
Flashcards
Chemistry
Chemistry
The study of matter and the changes it undergoes.
Matter
Matter
Anything that has mass and takes up space.
Physical Property
Physical Property
A characteristic of a substance that can be observed or measured without changing its identity.
Qualitative Property
Qualitative Property
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Quantitative Property
Quantitative Property
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Physical Change
Physical Change
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Changes of State
Changes of State
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Density
Density
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Density Formula
Density Formula
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Chemical Property
Chemical Property
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Combustibility
Combustibility
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Chemical Change
Chemical Change
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Clues of Chemical Change
Clues of Chemical Change
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Pure Substance
Pure Substance
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Element
Element
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Compound
Compound
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Mixture
Mixture
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Mechanical Mixture
Mechanical Mixture
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Solution
Solution
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Particle Theory
Particle Theory
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Physical or Chemical Change?
Physical or Chemical Change?
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Study Notes
What is Chemistry?
- Chemistry is the study of matter and its changes
- Matter is anything that has mass and takes up space
Physical Properties
- A physical property is a characteristic used to identify a substance
- A qualitative property is observed through senses (sight, smell, taste, touch)
- Examples: Color, texture, odor, luster, clarity, taste, state (solid, liquid, gas)
- A quantitative property is measured and has a numerical value
- Examples: Temperature, mass, volume, density, solubility
Other Physical Properties (Quantitative)
- Malleability: Ability to be hammered or bent into shapes
- Ductility: Ability to be pulled into wires
- Melting Point: Temperature at which a solid melts
- Boiling Point: Temperature at which a liquid boils
- Hardness: Resistance to being scratched or dented
- Crystal Form: Definite structure of cubes or blocks with a regular pattern
- Solubility: Ability to dissolve in a solvent (e.g., water)
- Viscosity: How easily a liquid flows (thickness)
- Density: Amount of matter per unit volume
Physical Change
- A physical change alters a substance's form or state, but not its chemical composition.
- Physical changes are reversible.
Changes of State
- Melting/Liquefaction: Solid to Liquid
- Freezing/Solidification: Liquid to Solid
- Evaporation: Liquid to Gas
- Condensation: Gas to Liquid
- Sublimation: Solid to Gas
- Example: Ice melting (water to liquid)
Density
- Density = mass/volume
- Units are g/mL or kg/L
Chemical Properties
- Chemical properties describe how a substance reacts to form a new substance (often with the help of heat or an acid)
- Examples: Combustibility (a substance reacting quickly with oxygen to produce heat and light)
Chemical Change
- A chemical change results in the formation of one or more new substances.
- Clues a chemical change has occurred:
- Formation of a new color
- Heat or light production
- Gas or bubbles formation
- Solid formation (precipitate) in a liquid
- Non-reversible.
Classifying Matter
- Matter can be classified into mixtures and pure substances
- Mixtures: contains more than one substance and can be separated into its components.
- Mechanical mixture (heterogeneous): Different substances are not evenly distributed (e.g. cereal and milk)
- Solution (homogeneous): Evenly distributed substances (e.g., sugar dissolved in water)
- Pure substances: only contains one substance
- Elements: cannot be broken down (e.g., gold)
- Compounds: consist of 2 or more elements chemically combined (e.g., water)
- Mixtures: contains more than one substance and can be separated into its components.
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