Changes & Separation Vocabulary · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Dissolve, melt and other change words

Science · Matter & Materials · ages 7-9
Name ______________________   Date ____________

  1. Sand does not dissolve in water. What word describes sand?

    • Soluble
    • Insoluble
    • Solution

  2. When sugar is stirred into water and disappears, what happened to it?

    • It dissolved
    • It melted
    • It evaporated

  3. Evaporate means a liquid turns into a gas.

    Circle one:   True   False

  4. You stir salt into water and it disappears, but sand stays in solid pieces. What does this tell you about sand?

    • Sand is soluble
    • It is insoluble
    • Sand melted

  5. Ice cubes left on a warm plate turn into a puddle. What happened?

    icewarm platepuddle
    • The ice dissolved
    • The ice evaporated
    • The ice melted

  6. Drops of water appear on the outside of a cold glass of juice. What just happened?

    • Vapor in the air condensed
    • The juice evaporated
    • The juice leaked through the glass

  7. Zara says: 'When water boils in a kettle and turns into a gas, that's condensing.' Is she right?

    • Yes, turning into a gas is condensing
    • No, the water is boiling into a gas; condensing is gas turning back into liquid
    • No, the water is melting

  8. Leo says: 'The chocolate melted in my hot cocoa, just like sugar dissolves in tea. They're the same thing.' What is wrong with what Leo said?

    • Nothing, they are the same
    • Dissolving only happens to sugar
    • Melting needs heat and changes a solid to liquid; dissolving mixes into liquid without needing heat
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Dissolve, melt and other change words W1-mt_ahSqW_kK1b-s1

  1. Insoluble · Insoluble materials don't dissolve. Sand just sinks and stays as sand.
  2. It dissolved · The sugar broke into tiny pieces and mixed into the water. That is dissolving, not melting.
  3. True · A puddle evaporating is its water turning into invisible water vapor, a gas.
  4. It is insoluble · Since sand didn't dissolve, it is insoluble. Salt, which did dissolve, is soluble.
  5. The ice melted · The heat from the plate changed the ice from a solid into a liquid. That is melting.
  6. Vapor in the air condensed · Water vapor in the air touched the cold glass and condensed back into liquid drops.
  7. No, the water is boiling into a gas; condensing is gas turning back into liquid · Boiling turns the liquid water into a gas. Condensing is the opposite: gas turning back into liquid.
  8. Melting needs heat and changes a solid to liquid; dissolving mixes into liquid without needing heat · Melting and dissolving are different changes. Chocolate melting needs heat; sugar dissolving just needs to mix into a liquid.
Worksheet · LightMySky