What does copper oxide produce at high temperature?

Laboratory preparation of copper oxide:

1. copper salt such as CuSO4 reacts with alkali (NaOH) to generate Cu(OH)2, and then Cu(OH)2 is decomposed by heating to prepare CuO.

　　CuSO4+2NaOH==Cu(OH)2↓+Na2SO4

　　Cu(OH)2=△=CuO+H2O

2. Heat copper (Cu) to make copper react with oxygen (O2) to generate oxidation

Copper (CuO).

　　2Cu+O2==2CuO

3. Copper oxide can be prepared by heating metallic copper in air or decomposing copper hydroxide, copper nitrate, basic copper carbonate, etc.