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Matter & Energy

Grade 2 · On-level practice · 8 questions · Version PG-1NSQDC2-AKDA

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1.Explain “evaporation” in your own words.
2.Explain “thermal equilibrium” in your own words.
3.Explain “conductor” in your own words.
4.Explain “insulator” in your own words.
5.Explain “conservation of energy” in your own words.
6.Explain “chemical reaction” in your own words.
7.Explain “density” in your own words.
8.Explain “condensation” 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 13
  1. Explain “evaporation” in your own words.change from liquid to gas at a surface
  2. Explain “thermal equilibrium” in your own words.a state in which objects have the same temperature
  3. Explain “conductor” in your own words.a material that transfers heat or electricity easily
  4. Explain “insulator” in your own words.a material that slows heat or electric transfer
  5. Explain “conservation of energy” in your own words.energy changes form but is not created or destroyed
  6. Explain “chemical reaction” in your own words.a process that forms new substances
  7. Explain “density” in your own words.mass per unit volume
  8. Explain “condensation” in your own words.change from gas to liquid

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.