18. What happens to the molecules when they are cooled?
A. They speed up and spread out.
b. They slow down and compress
c. They stop moving
d. They move closely together and speed up
A. They speed up and spread out.
b. They slow down and compress
c. They stop moving
d. They move closely together and speed up
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Explanation:
Cooling a substance decreases molecular motion. As molecular motion increases, the space between molecules increases. As molecular motion decreases, the space between molecules decreases.