How does knowing the reactants and products you classify a chemical reaction?

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

Which factor is likely to impact the possible number of compounds ?

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?