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
381–390 of 407 · Easy
Question 381
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 382
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 383
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 384
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 385
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.
Question 386
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name the ion that will produce oxygen gas at the anode during the electrolysis of aqueous potassium sulfate solution with inert electrodes.
(b)[1 mark]Write the ionic equation for the formation of oxygen at the anode.
(c)[1 mark]State another negative ion commonly found in salts that will also result in the formation of oxygen at the anode.
Question 387
2 marks · Easy
Answer and see the solution →A student electrolyses an aqueous solution of potassium nitrate using inert electrodes.
State the name of the product formed at:
(a)[1 mark]the cathode
(b)[1 mark]the anode
Question 388
1 mark · Easy
Answer and see the solution →State what you would observe if you tested solid sucrose (sugar) for electrical conductivity using an electric circuit with a bulb.
Question 389
3 marks · Easy
Answer and see the solution →A student investigates the conductivity of three white solids: sodium chloride, glucose, and wax. She sets up the following experiment:
Simple circuit for testing conductivity of solids (a)[1 mark]Sodium chloride does not conduct electricity as a solid, but the bulb lights up when it is dissolved in water. What does this indicate about sodium chloride?
(b)[1 mark]Glucose does not conduct electricity, whether solid or dissolved in water. What type of substance is glucose?
(c)[1 mark]Wax does not conduct electricity as a solid or when melted. What does this suggest about wax?
Question 390
2 marks · Easy
Answer and see the solution →Explain why sodium chloride conducts electricity when molten, but not as a solid.