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Topic 1 – Matter and Energy

9. Phase change diagrams: Recognizing phase change diagrams
1. Which diagram is showing a uniform cooling of a substance starting with the substance in the gas
phase?

1) 2) 3) 4)

2. Which diagram shows the uniform heating of a substance starting with the substance in the solid
phase?

1) 2) 3) 4)
3. Which diagram is showing a change in temperature of a substance as it is cooling?

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1) 3)

2) 4)

4. Which diagram is showing exothermic phase change taking place?

1) 3)

2) 4)

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