Question

when copper is heated in air to form cupric oxide​

Answer 1

$\huge\star\underline\green{Answer:-}$

The equation is

2Cu + O2 ---> 2CuO

The brown colour of copper turns into black due to the formation of Copper oxide.

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Answer 2

Answer:

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.