What is meant by the rate of a reaction? A. How Far to completion the reaction goes
B. How much energy the reaction requires
C. How Concentrated the final products are
D. How slow or fast a reaction progresses

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?