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
351–360 of 407 · Easy
Question 351
3 marks · Easy
Answer and see the solution →The electrolysis of molten zinc(II) chloride produces two substances at the electrodes.
(a)[1 mark]Write the ionic half-equation for the reaction at the cathode.
(b)[1 mark]Write the ionic half-equation for the reaction at the anode.
(c)[1 mark]State which type of particle (cation or anion) moves towards the cathode.
Question 352
2 marks · Easy
Answer and see the solution →Balance the following ionic half-equation for the electrolysis of molten calcium chloride so that both atoms and charges balance:
Question 353
2 marks · Easy
Answer and see the solution →Explain why sodium, and not chlorine, is formed at the cathode during the electrolysis of molten sodium chloride.
Question 354
3 marks · Easy
Answer and see the solution →A student studies the electrolysis of three molten ionic compounds.
Results of Electrolysis Compound Element at Cathode Element at Anode Magnesium fluoride ? Fluorine Lead(II) bromide Lead ? Potassium iodide ? Iodine (a)[1 mark]Complete the table by naming the element formed at the cathode for magnesium fluoride.
(b)[1 mark]Name the element formed at the anode for lead(II) bromide.
(c)[1 mark]Name the element formed at the cathode for potassium iodide.
Question 355
1 mark · Easy
Answer and see the solution →How many electrons are required to balance the following ionic half-equation for the reduction of potassium ions during the electrolysis of molten potassium chloride?
Question 356
3 marks · Easy
Answer and see the solution →This question is about the electrolysis of molten lithium bromide.
(a)[1 mark]Name the particle that moves towards the anode.
(b)[1 mark]State the element formed at the cathode.
(c)[1 mark]Explain, using ions, how you know which element forms at the cathode.
Question 357
2 marks · Easy
Answer and see the solution →Write the balanced ionic half-equation for oxygen formation at the anode during the electrolysis of molten aluminium oxide.
Question 358
1 mark · Easy
Answer and see the solution →State why the volume of chlorine gas collected at the anode is usually less than expected during the electrolysis of concentrated sodium chloride solution.
Question 359
3 marks · Easy
Answer and see the solution →A student is asked to investigate the electrolysis of an aqueous sodium chloride solution in the laboratory.
(a)[2 marks]Describe how you would set up apparatus to collect the products formed during this electrolysis.
(b)[1 mark]State one safety precaution you should take when performing this experiment.
Question 360
2 marks · Easy
Answer and see the solution →During the electrolysis of concentrated sodium chloride solution, a total of 8 cm³ of gas is collected at the cathode. The experiment is carried out at room temperature and pressure.
(a)[1 mark]Name the product formed at the cathode.
(b)[1 mark]What volume of chlorine gas would you expect to collect at the anode under the same conditions?