Question

You might have noted when copper powder is
heated in a China Dish, the reddish
brown surface of the copper powder becomes
ailed with a black substance
1. Why has the black substance formed?
2. What is the black substance.
3. Write a chemical equation for it.
4.How can the black coating be turned reddish brown?

Answer 1

Hey mate, Here are the answers...

1)The black substance is formed due to the oxidation of copper.

2)The black substance is Copper oxide.

3)Chemical equation is:

2Cu + O2---> 2CuO

4)It can be reduced as given below:

CuO + H2---> Cu +H2O

or

CuO+CO---->Cu +CO2

Hope it helps ! ! ! ! ! !

Answer 2

Step-by-step explanation:

The black substance is Cooper oxide which is formed due to the reaction between copper and Oxygen.

C + O2 -------> CO2