Question

What must happen for liquid water to become water vapor?

Select one:
a. The water molecules must lose energy and stop moving.

b. The water molecules must exert less pressure on their container.

c. The water molecules must gain kinetic energy.

d. The water molecules must lose heat and gain volume

I think its D. but I'm not sure...can someone explain?

Answer 1

the water molecules must gain kinetic energy in order to become water vapour

Answer 2

C. The water molecules must gain kinetic energy.

Step-by-step explanation:

When liquid water become water vapor, molecules move more, because they force between them is less strong. Notice that vapor water as lower consistency, it's like smoke where molecules can way anywhere, at this stage the force between molecules is not strong enough to maintain a ridig shape.

Now, at vapor stage, molecues have to gain more kinetic energy, because the least is the force between molecules, the more kinetic energy is gonna there.

Therefore, the right answer is C.