1 garm of copper powder was taken in a china dish and heated . what change takes place on heating? when hydrogen gas is passed over this heated substance , a visible change is seen in it . Give the chemical equation of reactions , the name and the colour of the products formed in each case .
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Answered by
6
Explanation:
When 1g of copper powder is taken in a china dish and heated, a black coloured substance is formed. This substance is copper oxide.
(Redbrown)
2Cu
+
(Fromair)
O
2
Heat
(Black)
2CuO
The copper gets oxidized to copper oxide.
When hydrogen gas is passed over this heated substance, CuO, copper metal is obtained.
The black-coloured CuO is reduced and brown colour Cu metal is produced.
(Black)
CuO
+
(Hydrogen gas)
H
2
⟶
Brown
Cu(s)
+H
2
O(l)
Answered by
2
When copper powder is heated in a china dish, in the presence of oxygen, a black residue is formed on the dish due to the formation of copper (II) oxide. This phenomenon is known as surface oxidation.
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