# 4-mark practice questions — Pearson Edexcel International GCSE Chemistry (4CH1)

> 158 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. [Aluminium chloride has the formula AlCl₃. State what is meant by the term relative formula mass and describe the steps y…](https://www.gradenine.co.uk/q/aluminium-chloride-has-the-formula-alcl-00a5a857)
2. [A student prepares a sample of copper(II) sulfate solution by adding dilute sulfuric acid to an excess of copper(II) car…](https://www.gradenine.co.uk/q/a-student-prepares-a-sample-of-0504bf78)
3. [A student performs flame tests and chemical tests on three separate solutions, labelled X, Y and Z. Solution X gives a b…](https://www.gradenine.co.uk/q/a-student-performs-flame-tests-and-06ce1375)
4. [Magnesium has atomic number 12. An atom of magnesium has two electrons in its outermost shell. Describe the arrangement …](https://www.gradenine.co.uk/q/magnesium-has-atomic-number-12-an-072c9f3f)
5. [When ammonium chloride dissolves in water, the temperature of the water decreases. Explain what this temperature change …](https://www.gradenine.co.uk/q/when-ammonium-chloride-dissolves-in-water-099af3fa)
6. [Methanol and butanol are both members of the alcohols homologous series. Describe TWO chemical properties that methanol …](https://www.gradenine.co.uk/q/methanol-and-butanol-are-both-members-0a32506c)
7. [Explain why two atoms of the same element can have different mass numbers.](https://www.gradenine.co.uk/q/explain-why-two-atoms-of-the-0b0253bc)
8. [Chlorine, bromine and iodine are all halogens in Group 7 of the periodic table. Describe and explain the trend in reacti…](https://www.gradenine.co.uk/q/chlorine-bromine-and-iodine-are-all-0c0601ab)

## Related

- [Pearson Edexcel International GCSE Chemistry (4CH1) revision notes](https://www.gradenine.co.uk/learn/pearson-edexcel-international-gcse-chemistry-4ch1)
- [Pearson Edexcel International GCSE Chemistry (4CH1) past papers](https://www.gradenine.co.uk/past-papers/pearson-edexcel-international-gcse-chemistry-4ch1)
- [Practise with AI marking (free)](https://www.gradenine.co.uk/start)