# 4-mark practice questions — AQA GCSE Chemistry (8462)

> 152 questions · chemistry

## 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

1. [Explain how increasing the surface area of a solid reactant increases the rate of reaction.](https://www.gradenine.co.uk/q/explain-how-increasing-the-surface-area-09d613e6)
2. [A factory produces a batch of painkiller tablets. A quality control technician uses paper chromatography to check whethe…](https://www.gradenine.co.uk/q/a-factory-produces-a-batch-of-0b417c9f)
3. [Describe the differences between catalytic cracking and steam cracking.](https://www.gradenine.co.uk/q/describe-the-differences-between-catalytic-cracking-0be28e0b)
4. [Iron reacts with sulfur to form iron sulfide. The equation for this reaction is: Fe + S → FeS. Explain why the mass of i…](https://www.gradenine.co.uk/q/iron-reacts-with-sulfur-to-form-0d5819cf)
5. [Explain why a life cycle assessment (LCA) is not a purely objective process.](https://www.gradenine.co.uk/q/explain-why-a-life-cycle-assessment-0f4cb8fa)
6. [Explain how an ionic bond is formed when sodium reacts with chlorine. Include in your answer the charges of the ions for…](https://www.gradenine.co.uk/q/explain-how-an-ionic-bond-is-11a89590)
7. [Explain how adding a catalyst increases the rate of a chemical reaction.](https://www.gradenine.co.uk/q/explain-how-adding-a-catalyst-increases-12059653)
8. [Titanium dioxide nanoparticles are used in some sunscreen products. Explain why manufacturers choose to use titanium dio…](https://www.gradenine.co.uk/q/titanium-dioxide-nanoparticles-are-used-in-13ecba31)

## Related

- [AQA GCSE Chemistry (8462) revision notes](https://www.gradenine.co.uk/learn/aqa-gcse-chemistry-8462)
- [AQA GCSE Chemistry (8462) past papers](https://www.gradenine.co.uk/past-papers/aqa-gcse-chemistry-8462)
- [Practise with AI marking (free)](https://www.gradenine.co.uk/start)