Question

If copper metal is heated over a flame it develops a coating. What is the colour and composition of coating.

Answer 1

When Copper (Cu) is heated over a flame , the oxygen from the air combines with copper to form copper(II) oxide. The colour of copper changes to black .
Therefore, the coating formed on the surface of copper is copper oxide or cupric oxide (CuO).

Here is the chemical equation for the chemical reaction :-

heat
2Cu + O₂ --------------> 2CuO

This is also an example of oxidation .
Copper is the getting oxidised to CuO.

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