Question

when copper powder is heated in china dish, the surface of copper powder becomes coated with a black colour substance. rn 1.how is this black colour substance formed??? rn 2.what is that black substance??? rn 3.write the chemical equation of the reaction that takes place... rn

Answer 1

1) The dark shading substance is shaped when hot copper powder responds with oxygen

2) The dark substance is copper (II) oxide CuO 3) 2Cu (s) + O2 (g) - - > 2CuO(s).

This copper oxide is dark in shading, on account of which the surface of copper powder turns dark.

Answer 2

Hey there !

Solution:

When Copper is burned in the presence of oxygen a black colored substance is formed over the copper surface.

1 ) This black colored substance is formed as a result of Copper reacting with atmospheric Oxygen while being heated up. This results in the formation of black colored coating.

2 ) The black color coating over the copper surface is called as Copper Oxide with the formula CuO.

3 ) The equation is as follows:

• 2 Cu + O₂ => 2 CuO

In this 2 moles of Cu reacts with 1 mole of dioxygen to give 2 moles of Copper ( II ) Oxide.

Hope my answer helped !