# "Explain and describe" questions — AQA A-Level Chemistry (7405)

> 6 questions · chemistry

## How to answer

"explain and describe" 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. [Iron and copper are both transition metals. Explain why iron is described as a transition metal and describe two ways in…](https://www.gradenine.co.uk/q/iron-and-copper-are-both-transition-18648233)
2. [Butene is an alkene with the molecular formula C₄H₈. Explain why butene belongs to the alkenes homologous series and des…](https://www.gradenine.co.uk/q/butene-is-an-alkene-with-the-19a5915f)
3. [Alkanes are used as fuels. Explain why cracking is carried out on long-chain alkanes and describe what happens during ca…](https://www.gradenine.co.uk/q/alkanes-are-used-as-fuels-explain-6303c38b)
4. [Combustion of fuels is an exothermic process. Explain what the term exothermic means and describe how the energy profile…](https://www.gradenine.co.uk/q/combustion-of-fuels-is-an-exothermic-750c8325)
5. [A student investigates the energy change when zinc powder is added to copper sulfate solution. The temperature of the mi…](https://www.gradenine.co.uk/q/a-student-investigates-the-energy-change-e4b4bdc7)
6. [Ethene is produced when long-chain hydrocarbons from crude oil are cracked. Explain why cracking is carried out in indus…](https://www.gradenine.co.uk/q/ethene-is-produced-when-long-chain-hydrocarbons-e6bcd7e7)

## 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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