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
921–930 of 991
Question 921
4 marks · Normal
Answer and see the solution →Copper(II) sulfate solution is electrolysed using inert electrodes for a long time.
(a)[2 marks]Describe what happens to the colour of the solution.
(b)[2 marks]Explain why these changes occur.
Question 922
2 marks · Hard
Answer and see the solution →Write the balanced half-equation for the reaction that takes place at the anode during the electrolysis of copper(II) sulfate solution using inert electrodes.
Question 923
5 marks · Hard
Answer and see the solution →A student performs the electrolysis of copper(II) sulfate solution using inert electrodes. Answer the following questions about the products at the electrodes.
(a)[1 mark]State the product formed at the cathode.
(b)[1 mark]State the product formed at the anode.
(c)[2 marks]Describe how you can identify the product formed at the anode during the electrolysis.
(d)[1 mark]What would you observe on the cathode after the electrolysis has run for a few minutes?
Question 924
2 marks · Hard
Answer and see the solution →Write the balanced half-equation for the reaction that takes place at the cathode when copper(II) sulfate solution is electrolysed using inert electrodes.
Question 925
1 mark · Easy
Answer and see the solution →State the ion that will produce oxygen gas at the anode, instead of a halogen, during the electrolysis of an aqueous solution.
Question 926
3 marks · Easy
Answer and see the solution →(a)[1 mark]A student electrolyses aqueous sodium nitrate using inert electrodes. State the product formed at the cathode.
(b)[1 mark]State the product formed at the anode.
(c)[1 mark]Write a half-equation for the reaction at the cathode.
Question 927
2 marks · Easy
Answer and see the solution →Calcium chloride solution is electrolysed using inert electrodes. Use the reactivity series to determine whether calcium or hydrogen is formed at the cathode. State your answer and give a reason.
Question 928
2 marks · Easy
Answer and see the solution →Explain why nitrate ions do not produce a gas at the anode during the electrolysis of aqueous sodium nitrate solution with inert electrodes.
Question 929
3 marks · Easy
Answer and see the solution →Ions present in three aqueous solutions Solution Cation(s) Anion(s) A K^+ Cl^- B Mg^{2+} SO_4^{2-} C Cu^{2+} NO_3^- (a)[1 mark]For solution B, state the product at the cathode when electrolysed using inert electrodes.
(b)[1 mark]For solution C, state the product at the anode when electrolysed using inert electrodes.
(c)[1 mark]For solution A, explain why this gas forms at the cathode instead of the metal.
Question 930
1 mark · Easy
Answer and see the solution →State whether aluminium or hydrogen is produced at the cathode during the electrolysis of aqueous aluminium sulfate using inert electrodes.