At room temperature, the metal mercury is a liquid. How could mercury be changed into a solid?

Question

A.
by adding energy to increase molecular motion

B.
by adding energy to decrease molecular motion

C.
by removing energy to increase molecular motion

D.
by removing energy to decrease molecular motion

Answer 1

To change mercury from a liquid to a solid, you would need to decrease the temperature, which removes energy from the system and reduces the molecular motion. Therefore, the correct answer is:

D. by removing energy to decrease molecular motion.