I. The temperature of a 250 g block of metal increases by 22.22 °C after 5000 J of heat is added. What is the specific heat of the unknown metal?

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?