What chemical reaction takes place when you heat copper pipes?

Also if anyone has a clue what type of reaction is it?

A piece of copper metal is oxidized to black copper oxide by air when heated in a flame. The copper begins to react more rapidly with oxygen from the air and a darker color can be seen on the surface of the copper. its an oxidation Reaction (with oxygen) 2 Cu(s ) + O2(g ) -- 2 CuO(s )

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Heating almost any metal will cause it to oxidize and change color. Depending on the purity of your pipes and the conditions under which they are heated copper pipes can become many colors from green to black. This is a simple oxidation-reduction reaction: 2Cu + O2 → 2CuO is the simplest equation I can give you.

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