What happens to the molecules of a gas when the gas is heated? A.
The gas becomes a liquid.

B.
The molecules collide less frequently.

C.
No change occurs with regard to the molecules.

D.
The average speed of the molecules increases.

the correct answer is D because the heat causes the molecules to speed up

a plasma is a warm ionized gasoline consisting of approximately equal numbers of definitely charged ions and negatively charged electrons. the characteristics of plasmas are notably unique from the ones of ordinary neutral gases in order that plasmas are considered a awesome "fourth kingdom of remember."