Question

you might have noticed that when copper powder is heated in a China dish the reddish brown surface of copper powder becomes coated with a black substance 1. why has this black substance formed 2. what is this black substance 3. write the chemical equation of the reaction that takes place 4. how can the black coating on the surface be turned reddish Brown
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Answer 1

Answer:

The surface of copper powder becomes coated with black copper (II)oxide. This is because oxygen is added to copper and copper oxide is formed.

    2Cu + O2 ———> 2CuO

If hydrogen gas is passed over the heated material(CuO),the black coating of the surface turn brown as the reverse reaction take place and copper is obtained.

    CuO + H2 ———>Cu + H2

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