14. Chemical reactions can occur when molecules collide. What happens when molecules collide but no chemical reaction takes place?
A. Atoms in the molecules are rearranged.
B The molecules change their shape.
C. The molecules bounce off each other.
D. The pressure in the container increases.

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing