A student has been collected silve r coin and copper coin after some day when she took out the coins to count she found a black coat on silver coin and green coat on copper cion which chemical phenomenon is responsible for such coating
Answers
Answered by
1
oxidation is the phenomenon responsible for this coating
Answered by
3
He observed a green coating on copper because his copper reacted with moist Carbon Dioxide ( CO2 ) in the air and it slowly lost its shiny brown surface and gained a green coat. That green substance so formed was of Copper Carbonate ( CuCO3.Cu[OH]2 ).
The chemical equation for the above reaction is:--
2Cu + O2 + H2O + CO2 → Cu(OH)2.CuCO3
Rahul also observed black coating on Silver for the fact that Silver reacted with sulphur in the air and formed a black coating of Silver Sulphide ( AgS ).
The chemical equation for the above reaction is-->
Ag (s) + S (g) ---> AgS (s)
The chemical equation for the above reaction is:--
2Cu + O2 + H2O + CO2 → Cu(OH)2.CuCO3
Rahul also observed black coating on Silver for the fact that Silver reacted with sulphur in the air and formed a black coating of Silver Sulphide ( AgS ).
The chemical equation for the above reaction is-->
Ag (s) + S (g) ---> AgS (s)
Similar questions