Question

Q. You might have noted that when copper powder is heated in a china dish, the
surface of copper powder becomes coated with a black colour substance.
(i) How has this black coloured substance formed?
(ii) What is that black substance?
(iii) Write the chemical equation of the reaction that takes place.​

Answer 1

Answer 1) The black coloured substance is formed due to oxidation of copper

Answer 2 )The black coloured substance is copper oxide.

Answer 3) chemical equation is

Heat

2 Cu+O2 -------) 2CuO