What is energy transmitted from one place to another by light?

When will le chatelier's principle come into effect? at the beginning of a reaction, when there are only reactants when a reaction has reached chemical equilibrium when a catalyst is added to a reaction mixture when a reaction is occurring but not yet at equilibrium

How would you reduce the volume of gas

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.