what happens when copper powder is heated in a China dish write the colour and name of the product obtained also write the change which is observed when hydrogen gas is passed over the above heated product write the balanced chemical equation involved in the above reaction
Answers
Answer
(a)When copper powder is heated in the presence of air (oxygen), copper reacts with oxygen to form copper oxide. The copper
oxide formed is black in colour. The black colour is formed due to the oxidation of copper takes place.
The chemical equation of the reaction that takes place is given below:
2Cu + O2→ 2CuO
Copper oxide
(b) When hydrogen gas is passed over hot copper oxide, the black coating on the surface turns brown as the reverse reaction takes place and copper is obtained.
The reaction that takes place is:
CuO + H2 → Cu + H2O
Answer:
the product formed is copper oxide
the colour change that takes place is black , the chemical eqation is 2Cu +. O2 = 2CuO
the change observed is a chemical change
when hydrogen is passed through the heated oxide the black colour oxide turns brown and reverse reaction takes place and copper is formed
balanced eqation ---> CuO + H2 = Cu + H2O
Explanation: