What is the half-equation for the reaction occurring at the anode in an alkaline hydrogen/oxygen fuel cell?
O2+2H2O+4e−→4OH−\text{O}_2 + 2\text{H}_2\text{O} + 4\text{e}^- \rightarrow 4\text{OH}^-O2+2H2O+4e−→4OH−
2H2+4OH−→4H2O+4e−2\text{H}_2 + 4\text{OH}^- \rightarrow 4\text{H}_2\text{O} + 4\text{e}^-2H2+4OH−→4H2O+4e−
2H2→4H++4e−2\text{H}_2 \rightarrow 4\text{H}^+ + 4\text{e}^-2H2→4H++4e−
O2+4H++4e−→2H2O\text{O}_2 + 4\text{H}^+ + 4\text{e}^- \rightarrow 2\text{H}_2\text{O}O2+4H++4e−→2H2O
81 exam-style questions on OCR GCSE Chemistry Improving processes and products. Each one has a worked solution and a mark scheme showing where the marks go.