Which of the following are true about boiling? 1. Boiling a liquid requires more energy than does evaporating it. 2. A liquid's boiling point varies with the atmospheric pressure. 3. The greater the ambient pressure, the lower is the boiling point

a. 2 and 3 only
b. 1 and 3 only
c. 1 and 2 only
d. 1, 2, and 3

ANS: C
Because the weight of the atmosphere retards the escape of vapor molecules, the greater the am-bient pressure, the greater is the boiling point.