When copper powder is heated in a china dish write the chemical equation involved in this process?

Text Solution

Solution : (i) The available information suggests the metal is copper. In open air, its is oxidised to form copper (II) oxide which is black in colour. The reaction is known as oxidation reaction. On passing hydrogen gas over the hot substance, the original colour of the metal is regained. It is an example of reduction reaction. <br> (ii) The balanced chemical equations for the reactions are : <br> `underset(("Metal"))(2Cu(s)) + O_(2)(g) overset("heat")rarr underset(("Black"))underset("Copper (II) oxide")(2CuO(s))` <br> `CuO(s) + H_(2)(g) overset("heat")rarrCu(s) + H_(2)O(g)`

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I) Copper oxideii)The chemical equation for the reaction is 2Cu + O2 -----> 2CuOthe black colour substance is formed by the reaction of copper with oxygen.

iii)When copper powder is heated, it combines with oxygen in air to form copper oxide. This copper oxide is black in colour, because of which the surface of copper powder turns black. This reaction is a redox reaction.

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