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6th grade · Science · Unit 3 of 9

Particles and Heat

How heating and cooling change matter

What your child practices

Solids, liquids and gases in the particle model, faster particles when heated and slower when cooled, melting, freezing, evaporation and condensation, and why mass stays the same in a phase change.

Washington State Learning Standards learning standard: MS-PS1-4 · how adding or removing thermal energy changes particle motion and state

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    Butter left on a warm counter gets soft and runny. What is happening?

    • The particles are disappearing
    • The butter is freezing
    • Heated particles move faster, so the solid is starting to melt

  2. Question 2

    Which state of matter fills its whole container?

    • Liquid
    • Solid
    • Gas

  3. Question 3

    What is evaporation?

    • A liquid changing to a gas
    • A gas changing to a liquid
    • A solid changing to a liquid

  4. Question 4

    What is condensation?

    • A liquid changing to a solid
    • A gas changing to a liquid
    • A solid changing to a gas

  5. Question 5

    What is freezing?

    • A liquid changing to a solid
    • A gas changing to a liquid
    • A solid changing to a liquid

  6. Question 6

    Why does water vapor form drops on the cold bathroom mirror?

    • The vapor freezes into ice
    • The vapor loses heat and condenses into liquid
    • The mirror makes water

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