Medicines and agricultural things. kills fungus and such like ....
Copper oxide consists of copper and oxygen hence the name copper oxide.
you obtain Cu from CuO only by reducing with hydrogen or carbon monooxide: CuO + H2 → Cu + H2O
Its Valency = 2 the formula being CuO The copper donates two electrons to the oxygen and forms one ionic bond.Added: There are two copper oxides, differing in color: if it is black powder, then it is...
You don't. Copper ore CONTAINS copper oxide.