Which of the following statements are true concerning the latent heat of fusion?
1. It is also called evaporation.
2. It is expressed in calories per gram.
3. It will cause a complete change of state.
4. It is expressed in grams per degree Celsius.
a. 1 and 2 c. 2 and 3
b. 1 and 3 d. 2, 3, and 4
ANS: C
Latent heat of fusion is the amount of heat, in calories, that must be added to cause a complete change of state. Evaporation is change from liquid to gas. Latent heat is expressed as calories per gram. Evaporation is the passive change of state over time, with no addition of heat.
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