Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
911–920 of 991
Question 911
1 mark · Easy
Answer and see the solution →Write the balanced half-equation for the reaction at the cathode during the electrolysis of copper(II) sulfate solution using inert electrodes.
Question 912
3 marks · Easy
Answer and see the solution →Explain why oxygen is produced at the anode and not sulfate ions are discharged during the electrolysis of copper(II) sulfate solution with inert electrodes.
Question 913
2 marks · Easy
Answer and see the solution →If all the copper(II) ions are removed from 100 mL of copper(II) sulfate solution by electrolysis with inert electrodes, explain and calculate what type of ions are left in the solution and what the new solution is.
Question 914
2 marks · Normal
Answer and see the solution →State the products formed at the cathode and at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes.
Question 915
4 marks · Normal
Answer and see the solution →Copper(II) sulfate solution is electrolysed using inert electrodes.
(a)[2 marks]Write the balanced half-equation for the reaction at the cathode.
(b)[2 marks]Write the balanced half-equation for the reaction at the anode.
Question 916
3 marks · Normal
Answer and see the solution →Copper is deposited at the cathode during the electrolysis of copper(II) sulfate solution with inert electrodes.
Question 917
3 marks · Normal
Answer and see the solution →Describe how the appearance and composition of copper(II) sulfate solution change after it is electrolysed for a long period using inert electrodes.
Question 918
4 marks · Normal
Answer and see the solution →The following table shows the observations at the electrodes during electrolysis of copper(II) sulfate solution with inert electrodes.
(a)[0 marks]Observations during Electrolysis Electrode Observation Cathode Pink/brown coating forms Anode Gas bubbles produced (b)[1 mark]Name the substance forming the pink/brown coating at the cathode.
(c)[1 mark]Name the gas produced at the anode.
(d)[2 marks]Suggest a simple test to confirm the identity of the gas collected at the anode.
Question 919
1 mark · Normal
Answer and check →Which of the following is the correct balanced half-equation for the reaction at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes?
- A.Cu^{2+}(aq) + 2e^- \rightarrow Cu(s)
- B.2Cl^-(aq) \rightarrow Cl_2(g) + 2e^-
- C.4OH^-(aq) \rightarrow 2H_2O(l) + O_2(g) + 4e^-
- D.H^+(aq) + e^- \rightarrow H_2(g)
Question 920
2 marks · Normal
Answer and see the solution →Explain why oxygen gas is produced at the anode during the electrolysis of copper(II) sulfate solution with inert electrodes.