copper does not burn but hot metal is coated with black coloured layer of copper oxide.Why?

Asked by Pawan | 23rd Sep, 2014, 01:31: PM

Expert Answer:

At normal  temperature, the surface of copper is covered with copper oxide. The thin layer of copper oxide is a protective cover which protects copper from further oxidation. Thus this copper oxide does not burn as it  is already reacted with the oxygen in the air. No further oxidation can occur.

Answered by Prachi Sawant | 23rd Sep, 2014, 02:47: PM