Question

What happens when copper metal is heated in air?

(a) Copper does not react with oxygen even at high temperature.

(b) Copper burns when heated to form black coloured copper oxide.

(c) Copper does not burn but is coated with black coloured copper oxide.

(d) Copper burns when heated to form brown coloured copper oxide.​

Answer 1

Answer:

◾ Heated copper metal reacts with oxygen to form the black copper oxide. The copper oxide can then react with the hydrogen gas to form the copper metal and water. When the funnel is removed from the hydrogen stream, the copper was still be warm enough to be oxidized by the air again.

◾ Therefore option (b)

Hope it helps u dear...❤❤❤

Answer 2

Explanation: option d is correct

Copper metal when exposed to hearing in air, oxygen reacts with copper surface forming thin layer of copper oxide over it. ... This layer being coated on pure copper, protects it from oxygen. Therefore, whole copper doesn't burn, instead black coat of copper oxide is formed over it.