Lesson T6.1.1

T6.1.1 Energy changes on changes of state Quiz: KS3 Chemistry, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T6.1.1, Energy changes on changes of state: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 6: Energetics, written with Revision Ninja.

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The 20 questions

  1. What happens to the energy of a substance as it melts?

    • It takes in energy from its surroundings
    • It stays at the same energy level throughout the change
    • It gives out energy to its surroundings
    • It creates its own energy from the particles around it

  2. What happens to a substance's energy as it freezes?

    • It gives out energy to its surroundings
    • It takes in energy from its surroundings
    • It destroys its energy
    • It stays at the same energy level

  3. Which change of state needs the most energy to occur?

    • Freezing, when a liquid becomes a solid
    • Boiling, when a liquid becomes a gas
    • Melting, when a solid becomes a liquid at its melting point
    • Condensing, when a gas becomes a liquid

  4. Why does the temperature of a melting solid stay the same for a while?

    • The particles stop moving completely as the solid melts
    • The energy supplied is used to break bonds between particles
    • The solid has stopped absorbing energy from the heater
    • The solid is losing as much energy to the air as it gains

  5. What happens to the particles of a gas when it condenses?

    • They lose energy and move closer together
    • They gain energy and spread further apart
    • They turn into a solid straight away as they cool
    • They stop moving completely and become solid

  6. Which change of state takes in energy from the surroundings?

    • Evaporation of water from a puddle
    • Water vapour turning into liquid on a cold window
    • Steam condensing on a cold plate
    • Liquid water freezing in an ice tray

  7. Which change of state is the reverse of melting?

    • Evaporation
    • Boiling
    • Freezing
    • Sublimation

  8. A solid changes straight into a gas without becoming a liquid. What is this process called?

    • Sublimation
    • Condensation
    • Freezing
    • Dissolving

  9. An ice cube melts in a glass of water. What happens to the temperature of the water around it?

    • It rises sharply, because ice is a liquid at room temperature
    • It rises, because the ice gives out energy to the water
    • It falls, because the ice takes in energy from the water
    • It stays exactly the same forever, because nothing changes

  10. Why does steam cause more severe burns than boiling water?

    • Steam releases energy as it condenses on the skin
    • Steam is colder than boiling water, so it cools the skin
    • Steam has less energy than boiling water, so it burns less
    • Steam does not give out energy to skin once it has cooled

  11. Which statement about energy and changes of state is correct?

    • Energy is only transferred during melting and freezing, not evaporating
    • Energy is transferred to or from the surroundings during any change of state
    • Energy is created when a liquid evaporates from its open surface area
    • Energy is never transferred during changes of state at normal pressure

  12. Which change of state releases energy to the surroundings?

    • Boiling of water in a kettle, which needs energy to be added
    • Melting of ice on a warm day in the garden
    • Condensation of water vapour on a cold window
    • Evaporation of water from a damp cloth in the sun

  13. During boiling, why does the temperature of the liquid stay constant even though heat is supplied?

    • The liquid is turning into a solid as its particles lock together
    • The heater has stopped working, so no energy is added
    • The liquid is losing as much energy as it gains from heat
    • The energy is used to separate particles from each other

  14. Which describes the particle arrangement of a liquid compared with a solid?

    • Particles are fixed in place in a regular pattern, unable to move
    • Particles do not move at all, but they still vibrate in place
    • Particles are far apart and move freely in every direction
    • Particles are close together but can move past each other

  15. A student heats wax until it melts. Which energy change is happening?

    • Energy is taken in to break forces holding particles in place
    • Energy is created inside the wax to make it liquid as it warms
    • Energy is given out to the air around the wax as it melts
    • Energy is destroyed as the wax melts into a clear liquid

  16. Which statement explains why sweat cools the skin when it evaporates?

    • Evaporation gives energy to the skin
    • Sweat turns into a solid on the skin
    • Evaporation takes in energy from the skin
    • Sweat stops the skin from transferring energy

  17. What happens to the internal energy of water as it freezes into ice at 0 °C?

    • It decreases, because energy is released to the surroundings
    • It becomes zero in the ice once it has frozen completely
    • It stays the same, because energy is not transferred at all
    • It increases, because energy is taken in from the surroundings

  18. Which statement about heating a substance at its melting point is correct?

    • The temperature falls while it melts into a liquid state
    • The solid stops absorbing energy once it reaches its melting point
    • The temperature rises steadily from the start of the heating process
    • The temperature stays constant until all the solid has melted

  19. Which change of state is the reverse of evaporation?

    • Condensation
    • Sublimation
    • Dissolving
    • Solidifying

  20. Why does ice feel cold when it melts on your hand?

    • It takes in energy from your hand to melt
    • It gives out energy to your hand to melt
    • It loses particles to your hand and cools
    • Its particles stop moving as it melts into the warm water around it

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