Consider these half reactions for a chemical reaction. Zn rightarrow Zn raised to the 2 plus power times A q plus 2 e raised to the negative power Cu raised to the 2 plus power times A q plus 2 e raised to the negative right arrow Cu times s power What is the overall equation for this chemical reaction?
Answer
A
Zn times s plus Cu raised to the 2 plus power times A q rightarrow Zn raised to the 2 plus power times A q plus Cu times s
B
Zn2(aq)+Cu(s)→Cu2+(aq)+Zn(s)
C
Zn(s)+Cu2+(aq)→Cu2+(aq)+2e−
D
Zn2+(aq)+2e→Cu2+(aq)+2e−
Explanation
Add the half-reactions: Zn(s) → Zn²⁺(aq) + 2e⁻ and Cu²⁺(aq) + 2e⁻ → Cu(s). The two electrons appear on opposite sides, so they cancel, leaving Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s). This is choice A.
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