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There are two copper oxides.

Copper I oxide (Cu2O) and copper II oxide (CuO) both contain copper and oxygen.

Copper II oxide is a reddish solid and Copper II oxide is a black solid.

Both are insoluble in water.

Copper sulfate (CuSO4) contains copper, sulfur, and oxygen.

It is most often found in its hydrated form as a blue solid, but allso occurs in its anhydrous form as a white solid.

It is soluble in water.

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13y ago
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13y ago

Cuprous oxide contains monovalent copper ions and has the formula Cu2O; cupric oxide contains divalent copper ions and has the formula CuO.

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13y ago

It's colour ! Ordinary copper ore is reddish in colour, and sulphur is yellow. Copper Sulphate is blue !

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Q: What distinguishes a compound like copper sulfate from an ordinary mixture of copper powder sulfur?
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