Phase Change Diagram Science Worksheets Page 2

1. What has to be added to a substance to cause a phase change?

2. Which type of energy is being transferred during a phase change (HINT: THE ANSWER IS ON

THE GRAPH)?

3. Which phase changes release heat?

4. Which phase changes require that energy is added to make it occur?

5. What do you call the process of a solid changing to a gas? (WHEN ALL ELSE FAILS, READ THE

DIRECTIONS)

6. Why do you think the temperature does not change while a liquid boils even though heat is

being added to the liquid?

7. What do you call the process of a liquid changing to a solid? (WHEN ALL ELSE FAILS, READ

THE DIRECTIONS)

8. What do you call the process of a liquid changing to a gas? (WHEN ALL ELSE FAILS, READ

THE DIRECTIONS)

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