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Matter & Energy

Grade 4 · Stretch challenge · 8 questions · Version PG-1KR8DN9-1MBE

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1.Explain “mixture” in your own words.
2.Explain “thermal equilibrium” in your own words.
3.Explain “endothermic process” in your own words.
4.Explain “conservation of energy” in your own words.
5.Explain “specific heat” in your own words.
6.Explain “solution” in your own words.
7.Explain “density” in your own words.
8.Explain “chemical reaction” 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 9
  1. Explain “mixture” in your own words.two or more substances physically combined
  2. Explain “thermal equilibrium” in your own words.a state in which objects have the same temperature
  3. Explain “endothermic process” in your own words.a process that absorbs energy from its surroundings
  4. Explain “conservation of energy” in your own words.energy changes form but is not created or destroyed
  5. Explain “specific heat” in your own words.energy needed to change a material's temperature
  6. Explain “solution” in your own words.a uniform mixture in which one substance dissolves in another
  7. Explain “density” in your own words.mass per unit volume
  8. Explain “chemical reaction” in your own words.a process that forms new substances

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.