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Okay, so the equation was Cu(SO4) (aq) + Zn (s) --> Zn(SO4) (aq) + Cu (s) Then I did. Cu +2 (aq) + SO4 -2 (aq) + Zn +2 (s) ---> Zn +2 (s) + SO4 -2 (aq) + Cu +2 (aq) Which of course is wrong because when you cross things out you end up with nothing. But I don't know why? Evidently, Cu is...