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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 specifically represents copper(II) oxide (copper in the +2 oxidation state).
Reason: oxygen is normally −2. In CuO, charge neutrality requires Cu = +2 (x + (−2) = 0 → x = +2). Copper(I) oxide has copper in the +1 state, so its formula is Cu2O (2·(+1) + (−2) = 0).
There are mixed‑valence copper oxides (e.g. Cu4O3) that contain both Cu(I) and Cu(II), but CuO is not one of them and cannot be used to denote Cu(I) oxide.
Reason: oxygen is normally −2. In CuO, charge neutrality requires Cu = +2 (x + (−2) = 0 → x = +2). Copper(I) oxide has copper in the +1 state, so its formula is Cu2O (2·(+1) + (−2) = 0).
There are mixed‑valence copper oxides (e.g. Cu4O3) that contain both Cu(I) and Cu(II), but CuO is not one of them and cannot be used to denote Cu(I) oxide.
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