Which describes the molecular behavior of a solid? i think it's a, but im not sure

a. molecules vibrate around a fixed point.
b. molecules are too far apart to affect each other.
c. molecules have the greatest energy of motion.
d. molecules are rigid and do not move.

To prevent the presence of air, noble gases are placed over highly reactive chemicals to act as inert "blanketing" gases. a chemical engineer places a mixture of noble gases consisting of 4.37 g of he, 13.36 g of ne, and 36.65 g of kr in a piston-cylinder assembly at stp. calculate the partial pressure in torr of kr.

If c + di is a point on the circle, then | c + di |=

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