Question

A sample of water is being heated over a flame. What happens to the water as it is heated?

Select one:
a. The volume of the water decreases.
b. The water undergoes an endothermic reaction.
c. The kinetic energy of the water molecules increases.
d. The velocity of the water molecules begins to decrease.

Answer 1

"c. The kinetic energy of the water molecules increases."
This is because heat and average kinetic energy are directly related. If you put more heat into the system, the average kinetic energy of the molecules will go up as well.