21) 1g 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
equations, the name and the colour of the products formed in each case.
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When 1g of copper powder is taken in a china dish and heated, a black coloured substance is formed. This substance is copper oxide.
(Red brown)
2Cu
+
(From air)
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)
Explanation:
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