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Matter & Energy

Grade 4 · Stretch challenge · 8 questions · Version PG-1KH8RYA-1MBE

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1.Explain “chemical reaction” in your own words.
2.Explain “endothermic process” in your own words.
3.Explain “solution” in your own words.
4.Explain “exothermic process” in your own words.
5.Explain “mixture” in your own words.
6.Explain “specific heat” in your own words.
7.Explain “thermal equilibrium” in your own words.
8.Explain “electromagnetic radiation” 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 8
  1. Explain “chemical reaction” in your own words.a process that forms new substances
  2. Explain “endothermic process” in your own words.a process that absorbs energy from its surroundings
  3. Explain “solution” in your own words.a uniform mixture in which one substance dissolves in another
  4. Explain “exothermic process” in your own words.a process that releases energy to its surroundings
  5. Explain “mixture” in your own words.two or more substances physically combined
  6. Explain “specific heat” in your own words.energy needed to change a material's temperature
  7. Explain “thermal equilibrium” in your own words.a state in which objects have the same temperature
  8. Explain “electromagnetic radiation” in your own words.energy carried by electric and magnetic waves

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.