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Matter & Energy

Grade 3 · On-level practice · 8 questions · Version PG-U0FKRG-11YL

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1.Explain “thermal equilibrium” in your own words.
2.Explain “condensation” in your own words.
3.Explain “evaporation” in your own words.
4.Explain “density” in your own words.
5.Explain “insulator” in your own words.
6.Explain “solution” in your own words.
7.Explain “mixture” in your own words.
8.Explain “conductor” in your own words.

Answers and teaching notes

Use the answers to check the work after the learner finishes. For writing prompts, the guide describes what a strong response should include.

Show answers for version 14
  1. Explain “thermal equilibrium” in your own words.a state in which objects have the same temperature
  2. Explain “condensation” in your own words.change from gas to liquid
  3. Explain “evaporation” in your own words.change from liquid to gas at a surface
  4. Explain “density” in your own words.mass per unit volume
  5. Explain “insulator” in your own words.a material that slows heat or electric transfer
  6. Explain “solution” in your own words.a uniform mixture in which one substance dissolves in another
  7. Explain “mixture” in your own words.two or more substances physically combined
  8. Explain “conductor” in your own words.a material that transfers heat or electricity easily

Worked example

Track matter and energy before and after a change.

Common mistake

Assuming matter disappears when it changes form.

Helpful hint

Identify the system and follow what enters, leaves, or transforms.