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

> 33 questions · chemistry

## How to answer

Say WHAT happens, in order. No reasoning. Structure: 1. First X. 2. Then Y. 3. Then Z. Assessment Objective: AO1. Every "describe" answer on this spec is marked against exactly this pattern.

## Sample questions

1. [Describe how a student could use the relative formula mass of a substance and a known number of moles to calculate the m…](https://www.gradenine.co.uk/q/describe-how-a-student-could-use-04ee33c0)
2. [Describe how the properties of elements change across Period 3 of the periodic table, from sodium to argon. Include at l…](https://www.gradenine.co.uk/q/describe-how-the-properties-of-elements-0fae865d)
3. [Ethanol can be produced by fermentation or by hydration of ethene. Describe the process of fermentation to produce ethan…](https://www.gradenine.co.uk/q/ethanol-can-be-produced-by-fermentation-15f0f9c0)
4. [A student is given four unlabelled liquids. The liquids are ethanol, ethanoic acid, propene and octane. The student uses…](https://www.gradenine.co.uk/q/a-student-is-given-four-unlabelled-1649c717)
5. [Describe the trends in reactivity and the nature of the oxides as you descend Group 2 of the periodic table. Explain why…](https://www.gradenine.co.uk/q/describe-the-trends-in-reactivity-and-1ea02e11)
6. [A chemist has three unlabelled bottles. Each bottle contains one of the following liquids: an alkane, an alkene, or a ca…](https://www.gradenine.co.uk/q/a-chemist-has-three-unlabelled-bottles-28a3b1f8)
7. [Ethene can be produced by cracking long-chain hydrocarbons from crude oil. Describe the two methods by which cracking ca…](https://www.gradenine.co.uk/q/ethene-can-be-produced-by-cracking-2a24a13a)
8. [A student has three unlabelled solutions: copper(II) sulfate, iron(III) chloride, and zinc sulfate. Describe how the stu…](https://www.gradenine.co.uk/q/a-student-has-three-unlabelled-solutions-2a28fa82)

## Related

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