Question

on heating copper powder in air in a china dish ,the surface of copper powder becomes black

Answer 1

HI

⭐️The surface of copper powder becomes black on heating since :

⚪️ Oxygen is added to copper and,

⚪️ Copper oxide is formed which is black in colour.

Hope it proved to be beneficial....

Answer 2

Answer:

On heating the copper powder in air, a black colour substance layers over the copper powder, which is mainly due to surface oxidation and the formation of a compound known as copper oxide.

This follows the basic chemical process of oxidation where copper reacts with oxygen present in the air on heating in order to form copper oxide.