Why the electrical purification of copper involves both an oxidation and a reduction process.
You understand that the electrical purification requires both an anode and a cathode. Can you explain where the impure copper goes (anode or cathode) and what reaction is taking place there?
Ah, nothing like doing someones homework.
Yeah I guess it does look like a bit like homework, I'll edit the answer.
Posts like this where there's almost no effort on the part of the user to elaborate on any aspect of the question are usually suspect.
Separate names with a comma.