A combination reaction is when two or more blank combine to form
one product. A decomposition reaction is when a substance breaks down
into two or more simpler substances in a chemical reaction,

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?