# "Describe and explain" questions — AQA A-Level Chemistry (7405)

> 25 questions · chemistry

## How to answer

"describe and explain" questions from AQA A-Level Chemistry (7405). Read the rubric carefully — the marking points cluster into scientific ideas rather than free-form prose.

## Sample questions

1. [Bromoethane can be converted into ethanol by reacting it with aqueous sodium hydroxide solution. Describe and explain wh…](https://www.gradenine.co.uk/q/bromoethane-can-be-converted-into-ethanol-0ff3a4af)
2. [Ethene is produced by cracking long-chain hydrocarbons. Ethene can be used as a monomer to make poly(ethene). Describe t…](https://www.gradenine.co.uk/q/ethene-is-produced-by-cracking-long-chain-1367687f)
3. [Ethanol can be produced by the fermentation of sugar solutions using yeast. Describe the conditions needed for fermentat…](https://www.gradenine.co.uk/q/ethanol-can-be-produced-by-the-19673596)
4. [A student adds bromine water to two test tubes, one containing hexane and one containing ethene. Describe what the stude…](https://www.gradenine.co.uk/q/a-student-adds-bromine-water-to-2b51912f)
5. [A student investigates how changing the concentration of hydrochloric acid affects the rate of reaction with marble chip…](https://www.gradenine.co.uk/q/a-student-investigates-how-changing-the-2bf77411)
6. [Describe the process of catalytic cracking and explain why cracking is a necessary industrial process.](https://www.gradenine.co.uk/q/describe-the-process-of-catalytic-cracking-2cc5c4b7)
7. [Alkanes and alkenes are both hydrocarbons produced during cracking. Describe how bromine water can be used to distinguis…](https://www.gradenine.co.uk/q/alkanes-and-alkenes-are-both-hydrocarbons-2e83cb08)
8. [Chloroethane can be made by reacting ethane with chlorine in the presence of ultraviolet light. Describe what happens du…](https://www.gradenine.co.uk/q/chloroethane-can-be-made-by-reacting-4f031ddc)

## Related

- [AQA A-Level Chemistry (7405) revision notes](https://www.gradenine.co.uk/learn/aqa-a-level-chemistry-7405)
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