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

The overall equation of this redox reaction is combination of the two half equations. The similar species on both sides are cancelled out leaving a net overall reaction:

Zn → Zn²⁺ + 2e⁻ oxidation step

Cu²⁺ + 2e⁻ → Cu reduction step

Combining both equations:

Zn + Cu²⁺ + 2e⁻ → Zn²⁺ + 2e⁻ + Cu

since the common specie on both sides is 2e⁻, they cancel out to give an overall reaction:

Zn + Cu²⁺ → Zn²⁺ + Cu

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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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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