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
811–820 of 991
Question 811
5 marks · Hard
Answer and see the solution →(a)[2 marks]Define what is meant by each of the following terms in relation to electrolysis: (i) anion, (ii) cation.
(b)[3 marks]Describe what happens during the electrolysis of molten potassium bromide (). In your answer, refer to the movement and discharge of ions at the electrodes.
Question 812
2 marks · Hard
Answer and see the solution →A student investigates the electrolysis of molten lead(II) bromide () using inert electrodes.
State one observation the student would make at each electrode during this experiment.
Question 813
1 mark · Easy
Answer and see the solution →State the product formed at the cathode during the electrolysis of molten calcium chloride ().
Question 814
3 marks · Easy
Answer and see the solution →The diagram shows the apparatus used to electrolyse molten lithium iodide ().
Electrolysis apparatus for molten LiI Answer the following questions about this electrolysis.
(a)[1 mark]Name the ion in molten that is attracted to the cathode.
(b)[1 mark]State what is formed at the anode.
(c)[1 mark]Write the half-equation for the reaction at the cathode.
Question 815
2 marks · Easy
Answer and see the solution →Write the balanced half-equation for the reaction at the anode during the electrolysis of molten potassium bromide (), and state how many electrons are involved per bromine molecule formed.
Question 816
3 marks · Easy
Answer and see the solution →The table below shows the ions present in three molten ionic compounds:
Compound Ions present A: MgF_2 B: KCl C: CaBr_2 (a)[1 mark]For compound B, name the product formed at the anode.
(b)[1 mark]For compound C, write the half-equation for the reaction at the cathode.
(c)[1 mark]For compound A, state the formula of the ion that gains electrons at the cathode.
Question 817
1 mark · Easy
Answer and see the solution →Write the formula of the ion that is reduced at the cathode when molten barium chloride () is electrolysed.
Question 818
3 marks · Easy
Answer and see the solution →Molten tin(II) chloride () is electrolysed using inert electrodes.
(a)[1 mark]Name the element formed at the cathode.
(b)[1 mark]Write the half-equation for the reaction at the anode.
(c)[1 mark]Explain briefly what happens to the ions during electrolysis.
Question 819
2 marks · Easy
Answer and see the solution →During the electrolysis of molten sodium bromide (), write the half-equation for the reaction at the cathode. State the number of electrons gained by each sodium ion.
Question 820
2 marks · Easy
Answer and see the solution →Molten calcium iodide () is electrolysed using inert electrodes.
(a)[1 mark]Write the half-equation for the reaction that occurs at the cathode during the electrolysis of molten calcium iodide.
(b)[1 mark]Explain why iodide ions move to the anode in this process.