Question

Cu- CuO- ?- Cu( OH)2- H2O- O2- CuO

Answer 1

2Cu + O2 = 2CuO 
CuO + 2HCl = CuCl2 + H2O
CuCl2 + 2NaOH = 2NaCl + Cu(OH)2
Cu(OH)2 --t--> CuO + H2O
2H2O --ток--> 2H2 + O2
O2 + 2Cu = 2CuO

Answer 2

The chemical reaction you seem to be describing involves the conversion of copper (Cu) to copper oxide (CuO), and then to copper hydroxide (Cu(OH)2) in the presence of water (H2O) and oxygen (O2). The "?" represents an unknown substance or condition. Here's a step-by-step explanation of the process:

1. Copper (Cu) reacts with oxygen (O2) in the air to form copper oxide (CuO): 2 Cu + O2 → 2 CuO

2. Copper oxide (CuO) can further react with water (H2O) to form copper hydroxide (Cu(OH)2): CuO + H2O → Cu(OH)2

So, in summary, the sequence is Cu → CuO → Cu(OH)2, with the involvement of O2 and H2O during these transformations. If you had a specific question or condition for the "?" part, please provide more details for a more accurate response.