Question

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

Answer 1

Hi there !

When Copper (Cu) is heated , 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.

Answer 2

Explanation:

plz refer the attachment

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