Podcast
Questions and Answers
What is the unit of density?
What is the unit of density?
- Newton
- Pascal
- Kelvin
- Kilogram per cubic metre (correct)
Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its boiling point.
Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its boiling point.
False (B)
What is the physical state of water at 0°C?
What is the physical state of water at 0°C?
Solid or a mixture of solid (ice) and liquid (water)
The unit of pressure is the ______.
The unit of pressure is the ______.
Match the following quantities with their corresponding units:
Match the following quantities with their corresponding units:
Which of the following produces more severe burns?
Which of the following produces more severe burns?
Water at room temperature is a solid.
Water at room temperature is a solid.
Convert 25°C to Kelvin.
Convert 25°C to Kelvin.
What happens to the kinetic energy of particles when the temperature of solids increases?
What happens to the kinetic energy of particles when the temperature of solids increases?
Latent heat is released when a solid changes into a liquid.
Latent heat is released when a solid changes into a liquid.
Define latent heat of fusion.
Define latent heat of fusion.
As water is heated, particles start moving ______.
As water is heated, particles start moving ______.
Match the state change with the energy change:
Match the state change with the energy change:
During the conversion of ice to water, what happens to the temperature?
During the conversion of ice to water, what happens to the temperature?
Particles in ice at 0°C (273 K) have more energy compared to particles in water at the same temperature.
Particles in ice at 0°C (273 K) have more energy compared to particles in water at the same temperature.
What causes particles to start vibrating with greater speed when solids are heated?
What causes particles to start vibrating with greater speed when solids are heated?
What happens to the kinetic energy of particles as temperature increases?
What happens to the kinetic energy of particles as temperature increases?
Diffusion is the process where particles of matter separate from each other.
Diffusion is the process where particles of matter separate from each other.
What is the effect of heating on diffusion and why?
What is the effect of heating on diffusion and why?
Particles of matter are constantly moving, meaning they possess __________ energy.
Particles of matter are constantly moving, meaning they possess __________ energy.
Match the following materials with their expected particle attraction strength:
Match the following materials with their expected particle attraction strength:
In Activity 1.6, why is it difficult to cut the surface of water with your fingers?
In Activity 1.6, why is it difficult to cut the surface of water with your fingers?
In the field game involving human chains, a group where participants hold each other very loosely represents particles with maximum force of attraction.
In the field game involving human chains, a group where participants hold each other very loosely represents particles with maximum force of attraction.
Flashcards
Change of state
Change of state
Transition of matter between solid, liquid, and gas.
Latent heat
Latent heat
Heat absorbed without showing a temperature rise during state change.
Latent heat of fusion
Latent heat of fusion
Heat needed to convert 1 kg of solid to liquid at melting point.
Kinetic energy
Kinetic energy
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Particle movement in solids
Particle movement in solids
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Particle movement in liquids
Particle movement in liquids
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Particle movement in gases
Particle movement in gases
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Phase transition
Phase transition
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Temperature unit
Temperature unit
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Mass unit
Mass unit
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Density definition
Density definition
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Pressure unit
Pressure unit
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State of water at 0°C
State of water at 0°C
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Effectiveness of ice vs water
Effectiveness of ice vs water
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Measurement of volume
Measurement of volume
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Temperature Effect
Temperature Effect
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Diffusion
Diffusion
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Intermixing Particles
Intermixing Particles
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Temperature and Diffusion
Temperature and Diffusion
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Attraction of Particles
Attraction of Particles
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Examples of Matter
Examples of Matter
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Experiment with Water
Experiment with Water
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Study Notes
Matter in Our Surroundings
- Matter is anything that occupies space and has mass
- All things in the universe are composed of matter
- Early philosophers classified matter into five basic elements (Panch Tatva)
- Modern scientists classify matter based on physical and chemical properties
Physical Nature of Matter
- Matter is made up of tiny particles
- Particles of matter have spaces between them
- Particles of matter constantly move
- Forces of attraction exist between particles of matter
- The strength of these forces varies between substances.
- The strength of the force of attraction between particles changes with temperature.
States of Matter
- Matter exists in three primary states: solid, liquid, gas.
- Solids have a definite shape and volume. Particles are tightly packed.
- Liquids have a definite volume but take the shape of their container. Particles are less tightly packed and can move around.
- Gases have neither a definite shape nor a definite volume. Particles are widely spread out and move freely.
- Matter can change from one state to another by adding or removing heat.
- Melting (Solid to Liquid)
- Freezing (Liquid to Solid)
- Boiling (Liquid to Gas)
- Condensation (Gas to Liquid)
- Sublimation (Solid to Gas)
- Deposition (Gas to Solid)
Factors Affecting Evaporation
- Surface area: A larger surface area increases evaporation.
- Temperature: Higher temperatures lead to faster evaporation.
- Humidity: Lower humidity values lead to faster evaporation.
- Wind speed: Higher wind speeds increase evaporation.
Evaporation and Cooling
- Evaporation causes cooling because particles with higher kinetic energy escape from the liquid, leaving behind particles with lower kinetic energy, thus lowering the average kinetic energy.
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