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Matter & Energy

Grade 4 · On-level practice · 8 questions · Version PG-1CX5YLP-XW0G

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1.Explain “exothermic process” in your own words.
2.Explain “thermal equilibrium” in your own words.
3.Explain “conservation of energy” in your own words.
4.Explain “electromagnetic radiation” in your own words.
5.Explain “endothermic process” in your own words.
6.Explain “chemical reaction” in your own words.
7.Explain “mixture” in your own words.
8.Explain “density” 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 3
  1. Explain “exothermic process” in your own words.a process that releases energy to its surroundings
  2. Explain “thermal equilibrium” in your own words.a state in which objects have the same temperature
  3. Explain “conservation of energy” in your own words.energy changes form but is not created or destroyed
  4. Explain “electromagnetic radiation” in your own words.energy carried by electric and magnetic waves
  5. Explain “endothermic process” in your own words.a process that absorbs energy from its surroundings
  6. Explain “chemical reaction” in your own words.a process that forms new substances
  7. Explain “mixture” in your own words.two or more substances physically combined
  8. Explain “density” in your own words.mass per unit volume

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.