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Grade 4 · Science · Unit 4 of 6

Particles & Mass

Matter has mass and space

What your child practises

Solids, liquids and gases at the particle level, how temperature changes particle speed, and conservation of mass (melting or dissolving doesn't change the total mass), with some adding of grams.

NWT Curriculum learning standard: Matter has mass and takes up space; effect of temperature on particle movement; conservation of mass

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

    Sam puts 650 g of water in a closed container in the freezer. What is the mass of the ice?

    ⚖️

    answer boxg

  2. Question 2

    What happens to particles when they are heated?

    🔥
    • They move slower
    • They stop moving
    • They move faster
    • They disappear

  3. Question 3

    In which state of matter are the particles packed tightly together?

    • 💧liquid
    • 🧱solid
    • 💨gas

  4. Question 4

    In which cup are the water particles moving the fastest?

    Cups of water
    CupTemperature
    A12 °C
    B50 °C
    C65 °C
    • Cup C
    • Cup A
    • Cup B

  5. Question 5

    In a gas, the particles…

    💨
    • stay locked in place
    • never move at all
    • spread far apart and move freely
    • are packed tightly in rows

  6. Question 6

    Solid, liquid or gas? Tap an item, then tap its basket.

    Sort into: 🧱 solid · 💧 liquid · 💨 gas

    • ♨️steam from a kettle
    • 🥛milk
    • 🌧️rain drops
    • 🧊ice cube
    • ✏️pencil
    • 🌬️the air you breathe out

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