What this topic covers
The syllabus points for Topic 4, with every question in the bank filed under exactly one of them. Each opens the bank filtered to that point.
- 4.1Electrolysis332 questions
- Define electrolysis as the decomposition of an ionic compound, when molten or in aqueous solution, by the passage of an electric current
- Identify in simple electrolytic cells: (a) the anode as the positive electrode (b) the cathode as the negative electrode (c) the electrolyte as the molten or aqueous substance that undergoes electrolysis
- Identify the products formed at the electrodes and describe the observations made during the electrolysis of: (a) molten lead(II) bromide (b) concentrated aqueous sodium chloride (c) dilute sulfuric acid using inert electrodes made of platinum or carbon / graphite
- State that metals or hydrogen are formed at the cathode and that non-metals (other than hydrogen) are formed at the anode
- Predict the identity of the products at each electrode for the electrolysis of a binary compound in the molten state
- State that metal objects are electroplated to improve their appearance and resistance to corrosion
- Describe how metals are electroplated
- Describe the transfer of charge during electrolysis to include: (a) the movement of electrons in the external circuit (b) the loss or gain of electrons at the electrodes (c) the movement of ions in the electrolyte
- Identify the products formed at the electrodes and describe the observations made during the electrolysis of aqueous copper(II) sulfate using inert carbon / graphite electrodes and when using copper electrodes 10 Predict the identity of the products at each electrode for the electrolysis of a halide compound in dilute or concentrated aqueous solution 11 Construct ionic half-equations for reactions at the anode (to show oxidation) and at the cathode (to show reduction)
- 4.2Hydrogen–oxygen fuel cells30 questions
- State that a hydrogen–oxygen fuel cell uses hydrogen and oxygen to produce electricity with water as the only chemical product
- Describe the advantages and disadvantages of using hydrogen–oxygen fuel cells in comparison with gasoline / petrol engines in vehicles
Learning objectives from the Cambridge 0620 syllabus 2026–28:CoreSupplement (Extended only)
How to use it
Open the bank and press Solve now to attempt questions one at a time with the answer revealed straight after, or Timed test to work under exam conditions. Written questions give you an answer pad and then the official mark scheme, so you mark yourself against what the examiner actually credits. Every question from 2015 onwards links to the full original paper and its mark scheme.