Consider the hall reactions below for a chemical reaction
znzn2+ (aq) + 2e
cu? " (aq) + 2e" - cu(s)
what is the overall equation for this chemical reaction?
zn(s) + cu2+ (aq) -- zn2+ (aq) + cu(s)
zn(s) + cu2+ (aq) cu* (ag)+ 2e"
zn2+ (aq) + cu(s) cu(aq) + zn(s)
zn2+ (aq) + 2e" - cu2(aq) + 2e

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