Question

copper roof turning green is a physical change or chemical change​

Answer 1

Explanation:

Copper turns green because of chemical reactions with the elements. Just as iron that is left unprotected in open air will corrode and form a flaky orange-red outer layer, copper that is exposed to the elements undergoes a series of chemical reactions that give the shiny metal a pale green outer layer called a patina.

Answer 2

Answer:

Chemical change

Explanation:

In this case copper is corroded due to its exposure to moisture and oxygen. When copper is corrroded it turns green in color

EQUATION-

$Cu + CO_2 + H_2O + O_2 \: \: \: - > Cu(OH)_2 + CuCO_3$