Question

Bromine gas in a container is heated over a flame. What happens to the average kinetic energy of the bromine particles?
It decreases rapidly.
It increases quickly.
It remains the same.
It decreases slowly.

Answer 1

It increases quickly.

Heating raises the temperature of the gas, and the average translational kinetic energy of gas particles is proportional to temperature (⟨KE⟩ = 3/2 kT), so the bromine molecules gain kinetic energy when heated.