The half equations for an acidic hydrogen-oxygen fuel cell are shown. Negative electrode: H2→2H++2e−\mathrm{H_{2} \rightarrow 2H^{+} + 2e^{-}}H2→2H++2e− Positive electrode: O2+4H++4e−→2H2O\mathrm{O_{2} + 4H^{+} + 4e^{-} \rightarrow 2H_{2}O}O2+4H++4e−→2H2O
Statement 1: hydrogen is oxidised because it loses electrons
Statement 2: two molecules of hydrogen react for every molecule of oxygen that reacts
Statement 3: electrons pass through the electrolyte from the hydrogen electrode to the oxygen electrode
Which statements are correct?
1 and 2 only
1 only
2 and 3 only
1, 2 and 3
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.