4-mark practice questions — OCR GCSE Chemistry A: Gateway Science (J248)
83 questions · chemistry · View as Markdown
How to answer
4-mark questions are the shortest levels-of-response band. Aim for four scientific ideas, each in its own short sentence.
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…
- Describe how steam cracking is used to produce smaller, more useful molecules from crude oil fractions, and explain why …
- Describe how scientists' understanding of atomic structure changed from Dalton's model to Rutherford's nuclear model, in…
- Explain why graphite can conduct electricity but most other giant covalent structures, such as diamond, cannot.
- A student is trying to identify the gases produced during an experiment. Describe the tests a student would carry out to…
- Describe how carbon dioxide emissions from human activity contribute to climate change, and explain one consequence of t…