# 4-mark practice questions — Cambridge International IGCSE Chemistry (0620)

> 225 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 the difference between an exothermic reaction and an endothermic reaction, and give one example of each type of …](https://www.gradenine.co.uk/q/explain-the-difference-between-an-exothermic-006a1b6d)
2. [Describe how a pure, dry sample of sodium chloride could be prepared by reacting sodium hydroxide solution with dilute h…](https://www.gradenine.co.uk/q/describe-how-a-pure-dry-sample-0318b86e)
3. [A student investigates the reactivity of four metals: aluminium, iron, platinum, and potassium. Using knowledge of the r…](https://www.gradenine.co.uk/q/a-student-investigates-the-reactivity-of-0427a3f7)
4. [Brass is an alloy made from copper and zinc. Compare the properties of brass with those of pure copper, and explain why …](https://www.gradenine.co.uk/q/brass-is-an-alloy-made-from-04747cad)
5. [Compare the arrangement and movement of particles in a solid with those in a gas, and use these differences to explain w…](https://www.gradenine.co.uk/q/compare-the-arrangement-and-movement-of-04d3e59e)
6. [Propanoic acid is a carboxylic acid used as a food preservative. Explain why propanoic acid is described as a weak acid,…](https://www.gradenine.co.uk/q/propanoic-acid-is-a-carboxylic-acid-05a51276)
7. [Poly(ethene) is made from ethene by a process called addition polymerisation. Describe what happens to ethene molecules …](https://www.gradenine.co.uk/q/poly-ethene-is-made-from-ethene-by-060537e2)
8. [Hydrogen peroxide decomposes into water and oxygen when manganese(IV) oxide is added as a catalyst. A student measures t…](https://www.gradenine.co.uk/q/hydrogen-peroxide-decomposes-into-water-and-0725eba3)

## Related

- [Cambridge International IGCSE Chemistry (0620) revision notes](https://www.gradenine.co.uk/learn/cambridge-international-igcse-chemistry-0620)
- [Cambridge International IGCSE Chemistry (0620) past papers](https://www.gradenine.co.uk/past-papers/cambridge-international-igcse-chemistry-0620)
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