Phase Changes

Question 1

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diagram 1

Question 2

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Molecules are speeding up as boiling occurs.

Question 3

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4

Question 4

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1, 2, and 3

Question 5

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It is true because heat is released when a gas changes to a liquid.

Question 6

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Heat energy is absorbed by the substance.

Question 7

Consider the temperature versus time graph below.In which region is the substance in both the solid phase and the liquid phase?

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2

Question 8

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A liquid evaporates faster at higher temperatures because more particles have a higher speed and can overcome attractions in the liquid.

Question 9

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at 120°C

Question 10

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sublimation

Phase Changes Answers