"Explain" questions — OCR GCSE Chemistry A: Gateway Science (J248)
68 questions · chemistry · View as Markdown
How to answer
WHAT + WHY. Every point paired with a because. Structure: X happens because Y. This causes Z because … Assessment Objective: AO2. Every "explain" answer on this spec is marked against exactly this pattern.
Sample questions
- A food scientist is investigating whether a sample of red food colouring is pure or a mixture of dyes. She uses paper ch…
- A scientist carries out electrolysis of molten lead bromide using inert electrodes. Explain what happens at each electro…
- Explain why phytomining is considered a more sustainable method of metal extraction than traditional mining, and describ…
- Explain why graphite can conduct electricity but most other giant covalent structures, such as diamond, cannot.
- A student tests three unknown solutions to identify the halide ions present. They add a few drops of silver nitrate solu…
- Carboxylic acids are a homologous series of organic compounds. Explain the typical acidic properties of carboxylic acids…
- A student burns a piece of wood in a fireplace. The room feels warmer after the wood has been burning for a few minutes.…
- The contact process is used industrially to manufacture sulfuric acid. Explain why the conditions used in the contact pr…