How does the molecular motion of a substance change when it goes from liquid to solid?

A.
The molecules gain energy, and their relative motion increases.

B.
The molecules gain energy, and their relative motion decreases.

C.
The molecules lose energy, and their relative motion decreases.

D.
The molecules lose energy, and their relative motion increases.

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon