## Section Assessment

Section Summary

I Changes of state involve thermal energy.

I The law of conservation of matter states that matter cannot be created or destroyed.

I The law of conservation of energy states that energy is neither created nor destroyed.

Understand Main Ideas

1. i man hTM Explain how thermal energy is involved in changes of state.

2. Evaluate the nature of the thermal vibrations in each of the four states of matter.

3. Apply what you know about thermal energy to compare evaporation and condensation.

Think Critically

4. Infer how the boiling point of water (100°C) would change if water molecules were not polar molecules.

5. Consider glass and diamond—two clear, colorless solids. Why does glass shatter more easily than diamond?

■Miiii^ Earth Science

6. Refer to Figure 3.18. Calculate the corona's temperature in degrees. Remember that 273 K is equal to 0°C.

Earth -Schick il ne

Self-Check Quiz glencoe.com

Section 3 • States of Matter 75

Earth -Schick

Self-Check Quiz glencoe.com

Section 3 • States of Matter 75

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