Question

1 gram of A copper powder was taken in China dish and heated water changes takes place on heating? When the hydrogen gas is passed over this heat is substance a visible change is seen it in it give the chemical equation of the reaction the name and the colour of the product formed in each case

Answer 1

Answer:

When the “copper powder” is heated in a 'china dish', the copper powder surface becomes coated with “black colour substance” due to the formation of 'copper oxide' by surface oxidation. Copper reacts with oxygen in the air upon heating and forms copper oxide.

Chemical reaction

2Cu + O2 → 2CuO

The copper gets oxidized to copper oxide.

When hydrogen gas is passed over this heated susbstance, CuO, copper metal is obtained.

The black colored CuO is reduced and red brown color Cu metal is produced.

Thank you