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Grade 7 · Science · Unit 5 of 9

Heat & Particles

Heat, motion and changing state

What your child practises

Heat as energy linked to particle motion, temperature, expansion and contraction, changes of state, and the ways heat is generated (friction, electricity, burning, chemical reactions and the Sun).

New Brunswick Curriculum skill descriptor: Scientific Literacy: Sensemaking · heat and particles

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

    A pot of water is heated from 15 °C to 65 °C. By how many degrees did its temperature rise?

    answer box°C

  2. Question 2

    Temperature is a measure of…

    • how fast the particles are moving, on average
    • how big the particles are
    • how many particles there are
    • how much space the substance fills

  3. Question 3

    Gas particles in a sealed rigid container are heated. What happens to the pressure inside?

    • It stays the same
    • The particles disappear
    • It decreases because the particles slow down
    • It increases because the particles hit the walls more often and harder

  4. Question 4

    How does a liquid thermometer work?

    • The liquid disappears when cooled
    • The liquid turns into a solid
    • The tube grows when heated
    • The liquid expands when heated and rises in the tube

  5. Question 5

    At 400 °C, what state is mercury?

    mercury
    Melting pointBoiling point
    −39 °C357 °C
    • liquid
    • gas
    • solid

  6. Question 6

    As a solid melts, its particles…

    • stop vibrating
    • become different particles
    • lose all their energy
    • gain energy and move more freely

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