Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The electrolysis of other molten substances
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →Write the ionic half-equations for the electrolysis of molten magnesium chloride. Identify which half-equation is for the cathode and which is for the anode.
Question 2
4 marks · Normal
Answer and see the solution →This question is about the electrolysis of molten lead(II) bromide.
(a)[2 marks]Write the balanced ionic half-equation for the reaction at the cathode.
(b)[2 marks]Write the balanced ionic half-equation for the reaction at the anode.
Question 3
3 marks · Normal
Answer and see the solution →A chemist electrolyses molten potassium iodide (KI).
Predict which element is formed at (a) the cathode and (b) the anode. Explain your reasoning in each case.
Question 4
3 marks · Normal
Answer and see the solution →During the electrolysis of molten aluminium oxide, explain how you can check that each ionic half-equation is correctly balanced. Include checks for both the numbers of atoms and the charges.
Question 5
4 marks · Normal
Answer and see the solution →Student equations for the electrolysis of molten calcium bromide Student Cathode equation Anode equation A Ca^{2+} + 2e^- \to Ca 2Br^- \to Br_2 + 2e^- B Ca^{2+} \to Ca + 2e^- Br^- \to Br_2 + 2e^- C Ca^{2+} + e^- \to Ca 2Br^- \to Br_2 + 2e^- D Ca^{2+} + 2e^- \to Ca 2Br^- \to Br_2 + e^- Use the table above. For each equation below, state which students wrote it correctly. For each incorrect equation, explain the mistake.
Question 6
1 mark · Normal
Answer and check →Which element forms at the anode during the electrolysis of molten sodium bromide (NaBr)?
- A.Bromine
- B.Sodium
- C.Hydrogen
- D.Oxygen
Question 7
2 marks · Normal
Answer and see the solution →Complete the ionic half-equations for the electrolysis of molten copper(II) bromide. Include state symbols.
Question 8
4 marks · Normal
Answer and see the solution →This question is about the electrolysis of molten tin(II) chloride (SnCl2).
(a)[2 marks]Write the balanced ionic half-equation for the reaction at the cathode.
(b)[2 marks]Write the balanced ionic half-equation for the reaction at the anode.