Chemical equation for:

Cuprite, copper (I) oxide

Chalcocite, copper (I) sulfide

Covellite, copper (II) sulfide

Chemical formula for cuprite is Cu₂O. Copper has oxidation number + 1 and oxygen has - 2 (2· (+1) + (-2) = 0).

Chemical formula for chalcocite is Cu₂S. Copper has oxidation number + 1 and sulfur has - 2 (2· (+1) + (-2) = 0).

Chemical formula for covellite is CuS. Copper has oxidation number + 2 and sulfur has - 2.