Lesson 4: Phase Changes

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

2

When does carbon dioxide absorb the most heat energy?

During sublimation

Which example involves a phase change in which heat energy is released by the substance?

Freezing ice cream

Consider the heating curve for water. At what temperature does the solid start melting?

0 degrees C

The diagram below shows the different phase transitions that occur in matter. Which arrow would most likely represent the phase change that occurs when silver is poured into a mold and cools to become a solid bar?

5

The diagram below represent the four states of matter. Which diagram represents the phase that occurs after a solid melts?

Diagram 1


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