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 energy change occurs when a solid substance melts?

    • Loses heat
    • Gives out energy
    • Takes in energy
    • Destroys energy

  2. What energy change occurs when a liquid substance freezes?

    • Gains energy
    • Takes in energy
    • Absorbs heat
    • Gives out energy

  3. Which change of state requires the most thermal energy?

    • Freezing
    • Melting
    • Condensing
    • Boiling

  4. Why does temperature stay constant while a solid melts?

    • Energy breaks bonds
    • Particles stop moving
    • Energy creates heat
    • Reaction slows down

  5. How do gas particles behave when the gas condenses into a liquid?

    • Speed up significantly
    • Move closer together
    • Gain kinetic energy
    • Move further apart

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

    • Deposition
    • Condensation
    • Freezing
    • Evaporation

  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. What happens to the temperature of water when an ice cube melts in it?

    • It fluctuates
    • It falls
    • It stays constant
    • It rises

  10. What energy change occurs when steam condenses on the skin?

    • Temperature decreased
    • Energy absorbed
    • Energy released
    • No energy change

  11. Which process always involves energy transfer to or from the surroundings?

    • Dissolving sugar
    • Compressing a gas
    • Change of state
    • Thermal expansion

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

    • Condensation
    • Evaporation
    • Melting
    • Boiling

  13. During boiling, why does the temperature of a liquid stay constant?

    • Reactions stop
    • Energy increases speed
    • Energy separates particles
    • Heat is lost

  14. How are particles arranged in a liquid compared to a solid?

    • Far apart and fast
    • Fixed in a lattice
    • Close but free
    • Random and very slow

  15. What energy change happens when solid wax melts?

    • Energy is released
    • Pressure is created
    • Temperature increases
    • Energy is taken in

  16. Why does sweat cooling the skin involve evaporation?

    • Condensation releases heat
    • Evaporation absorbs heat
    • Freezing cools skin
    • Sublimation warms skin

  17. What happens to internal energy as liquid water freezes at 0 degrees Celsius?

    • It stays constant
    • It fluctuates
    • It increases
    • It decreases

  18. What happens to temperature when heating a substance at its melting point?

    • It stays constant
    • It drops to zero
    • It rapidly increases
    • It fluctuates wildly

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

    • Condensation
    • Sublimation
    • Dissolving
    • Solidifying

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

    • It releases energy
    • It creates coldness
    • It reacts with skin
    • It absorbs body heat

All KS3 Chemistry quizzes