Answer each of the following questions with increases, decreases, or does not change.

(a) If the intermolecular forces in a liquid increase, the normal boiling point of the liquid — .

(b) If the intermolecular forces in a liquid decrease, the vapor pressure of the liquid — .

(c) If the surface area of a liquid decreases, the vapor pressure — .

(d) If the temperature of a liquid increases, the equilibrium vapor pressure — .