Q5. 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 reactions, the name and the color of
the products formed in each case.
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Answers
The chemical reactions are:
2Cu + O₂ → 2CuO
CuO + H₂ → Cu +H₂O
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.
The followiing reaction is shown below.
2Cu + O₂ → 2CuO
Again when CuO is treated with hydrogen gas, CuO gets reduced to Cu, a brown residue.
CuO + H₂ → Cu +H₂
Answer:
When 1g of copper powder is taken in a china dish and heated, a black coloured substance if formed. This substance is copper oxide.
2CU + O2 ---------> 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.
CUO +H2 ----------> CU(S) + H2O(I)