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Explain whether the formula CuO can be used to represent both copper(I) oxide and copper(II) oxide.










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No. CuO is the formula for copper(II) oxide (cupric oxide) only.

Reason:
- In CuO, oxygen is −2, so copper must be +2 to give a neutral compound: Cu(+2) + O(−2) = 0 → copper(II) oxide.
- Copper(I) oxide (cuprous oxide) has copper in the +1 state and the correct formula is Cu2O: 2·(+1) + (−2) = 0.

So Cu2O = copper(I) oxide (red), and CuO = copper(II) oxide (black). They are distinct compounds and CuO does not represent Cu(I) oxide.