Question

15g 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 reactions equation,the name and colour of products formed in each case​

Answer 1

Explanation:

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.

The copper oxide thus formed can be reduced to its basic metal form by reducing it with hydrogen or carbon monoxide. The equation of ‘copper

(II) oxide’ formation is: 2Cu + O2 → 2CuO