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Matter & Energy

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

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1.Explain “chemical reaction” in your own words.
2.Explain “conservation of energy” in your own words.
3.Explain “density” in your own words.
4.Explain “exothermic process” in your own words.
5.Explain “endothermic process” in your own words.
6.Explain “thermal equilibrium” in your own words.
7.Explain “solution” in your own words.
8.Explain “specific heat” 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 18
  1. Explain “chemical reaction” in your own words.a process that forms new substances
  2. Explain “conservation of energy” in your own words.energy changes form but is not created or destroyed
  3. Explain “density” in your own words.mass per unit volume
  4. Explain “exothermic process” in your own words.a process that releases energy to its surroundings
  5. Explain “endothermic process” in your own words.a process that absorbs energy from its surroundings
  6. Explain “thermal equilibrium” in your own words.a state in which objects have the same temperature
  7. Explain “solution” in your own words.a uniform mixture in which one substance dissolves in another
  8. Explain “specific heat” in your own words.energy needed to change a material's temperature

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.