# "Describe and explain" questions — AQA GCSE Chemistry (8462)

> 7 questions · chemistry

## How to answer

"describe and explain" questions from AQA GCSE Chemistry (8462). Read the rubric carefully — the marking points cluster into scientific ideas rather than free-form prose.

## Sample questions

1. [Describe how a covalent bond is formed between two non-metal atoms and explain why simple molecular substances such as h…](https://www.gradenine.co.uk/q/describe-how-a-covalent-bond-is-3d2817cc)
2. [Describe how fractional distillation is used to separate crude oil into fractions, and explain why fractions collected n…](https://www.gradenine.co.uk/q/describe-how-fractional-distillation-is-used-85c6b32b)
3. [Ethanol can be manufactured by the fermentation of sugar solutions using yeast. Describe what happens during fermentatio…](https://www.gradenine.co.uk/q/ethanol-can-be-manufactured-by-the-a9b60797)
4. [Magnesium reacts with dilute hydrochloric acid to form magnesium chloride and hydrogen gas. Describe what happens during…](https://www.gradenine.co.uk/q/magnesium-reacts-with-dilute-hydrochloric-acid-b9acb4d9)
5. [Ethene reacts with bromine water. Describe what is observed and explain why ethene reacts in this way but ethane does no…](https://www.gradenine.co.uk/q/ethene-reacts-with-bromine-water-describe-c00901b3)
6. [A reversible reaction takes place in a closed container. After some time, the system reaches equilibrium. A student adds…](https://www.gradenine.co.uk/q/a-reversible-reaction-takes-place-in-d074a7c0)
7. [Zinc, iron and copper are metals that can react with dilute sulfuric acid. Describe what happens when zinc is added to d…](https://www.gradenine.co.uk/q/zinc-iron-and-copper-are-metals-dfe5d0fd)

## Related

- [AQA GCSE Chemistry (8462) revision notes](https://www.gradenine.co.uk/learn/aqa-gcse-chemistry-8462)
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