Is there a chemical difference between the gauseos and liquid state of the same substance?

Answer 1

There is no chemical difference, the only difference is the speed in which the molecules of the substances move. Slower molecules can be solid or liquid and very high speed molecules can be gas.

Answer 2

No, the chemical composition of a substance remains the same whether it is in a gaseous or liquid state. The difference between gaseous and liquid states is primarily due to differences in intermolecular forces and molecular arrangement.