Question

Why do coppers turn green when left in open give chemical equationalso

Answer 1

Copper turns green because of chemical reactions with the element Just as iron that is left unprotected in open air will corrode and form a flaxy 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

because it will react with air and form basic copper corbonate.

yup cu + CO2 +h2o gives cu(0h).cuco3