This appears to be a chemical reaction involving copper oxide (CuO), copper metal (Cu), copper chloride (CuCl2), copper nitrate (Cu(NO3)2), and more copper metal (Cu).

The exact reaction cannot be determined without more specific information about the conditions in which it takes place. However, it appears that copper is being oxidized and reduced in the presence of various copper compounds.

If you can provide more details, such as the reaction conditions, reactant concentrations, temperature, and other relevant information, I can help you determine the specific reaction that is taking place.