Question

A student has been collecting silver and copper coins one day she observe a black coating on silver and a green coating on copper coins which chemical phenomenon is responsible for these coating write the chemical names of black and green coatings

Answer 1

Answer: this due to OXIDATION of copper and silver

silver oxide and copper oxide

Explanation:

When exposed copper will react with atmospheric oxygen ..

2Cu + O₂  ⇒ 2CuO

THIS GIVES US THE GREENISH OXIDE OF COPPER.

When exposed silver will react with atmospheric oxygen ..

2Ag + O₂ ⇒  Ag₂O

THIS GIVES US THEBLACK OXIDE OF SILVER.