Water can be decomposed into hydrogen and oxygen by of electrolysis.
Complete the half-equation for the production of hydrogen gas at the negative electrode:
2H++‾e−→H2 2\text{H}^+ + \underline{\quad} \text{e}^- \rightarrow \text{H}_2 2H++e−→H2The overall chemical equation for the electrolysis of water is:
2H2O(l)→2H2(g)+O2(g) 2\text{H}_2\text{O}(\text{l}) \rightarrow 2\text{H}_2(\text{g}) + \text{O}_2(\text{g}) 2H2O(l)→2H2(g)+O2(g)If 15 cm3 of oxygen gas is collected, what volume of hydrogen gas is collected under the same conditions of temperature and pressure?
Practise AQA GCSE Chemistry Electrolysis with exam-style questions for Foundation and Higher tier. 23 questions covering The process of electrolysis, Electrolysis of molten ionic compounds, Using electrolysis to extract metals, Electrolysis of aqueous solutions, and Representation of reactions at electrodes as half equations (HT only), matched to the AQA GCSE Chemistry (8462) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.