Which is not a characteristic of chemical equilibrium? the reactions go to completion. the reactions are reversible. the reaction occurs in a closed container. the forward and reverse processes occur at the same rate.

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?