Write two chemical formulas that produce copper sulfate

CuO+H2SO4=CuSO4+H2O
Cu (OH)2+H2SO4=CuSO4+2H2O

Is potassium permanganate a pure substance stainless steel is not pure substance iodized salt is not pure substance mineral water is not pure substance

Potassium permanganate is pure.
Stainless steel is not pure, it contains carbon.
Iodized salt is not pure.
Mineral water is not pure, there are minerals in it.
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