CH-1762

Half-equations

Chemistry · Secondary 4 · Medium · Half-equations

1. $\text{Cu}^{2+} (aq) + 2e^- \rightarrow \text{Cu} (s)$
2. $\text{Cu} (s) \rightarrow \text{Cu}^{2+} (aq) + 2e^-$
3. $2\text{H}_2\text{O} (l) + 2e^- \rightarrow \text{H}_2 (g) + 2\text{OH}^- (aq)$
4. $4\text{OH}^- (aq) \rightarrow 2\text{H}_2\text{O} (l) + \text{O}_2 (g) + 4e^-$

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