In a simple cell made with zinc and copper electrodes, the more reactive zinc is oxidised. Which half equation shows this?
Zn2++2e−→Zn\mathrm{Zn^{2+}+2e^-\rightarrow Zn}Zn2++2e−→Zn
Zn→Zn2++2e−\mathrm{Zn\rightarrow Zn^{2+}+2e^-}Zn→Zn2++2e−
Zn→Zn++e−\mathrm{Zn\rightarrow Zn^{+}+e^-}Zn→Zn++e−
Cu→Cu2++2e−\mathrm{Cu\rightarrow Cu^{2+}+2e^-}Cu→Cu2++2e−
42 exam-style questions on Edexcel GCSE Chemistry 6.4 Chemical cells and fuel cells, covering 6.4.1 Chemical cells and fuel cells. Each one has a worked solution and a mark scheme showing where the marks go.