# "Describe" questions — OCR A-Level Chemistry B: Salters (H433)

> 13 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. [A teacher asks students to compare the most abundant elements found in the human body with those found in the universe a…](https://www.gradenine.co.uk/q/a-teacher-asks-students-to-compare-01ca6ab4)
2. [A company extracts iodine from seaweed on an industrial scale. After harvesting the seaweed, it is burned to produce ash…](https://www.gradenine.co.uk/q/a-company-extracts-iodine-from-seaweed-10f606ca)
3. [Ethanol can be oxidised to form a carboxylic acid. Describe the properties of carboxylic acids, including their function…](https://www.gradenine.co.uk/q/ethanol-can-be-oxidised-to-form-1b14a96e)
4. [A student is investigating how the volume of gas produced changes over time when zinc granules react with dilute sulfuri…](https://www.gradenine.co.uk/q/a-student-is-investigating-how-the-3abf405f)
5. [A forensic scientist is analysing an unknown organic liquid recovered from a crime scene. The liquid is suspected to be …](https://www.gradenine.co.uk/q/a-forensic-scientist-is-analysing-an-3ea3c8f2)
6. [Ethanol is an alcohol used in alcoholic drinks and as a fuel. When ethanol burns completely in oxygen, it produces carbo…](https://www.gradenine.co.uk/q/ethanol-is-an-alcohol-used-in-7e2e6edb)
7. [Ethanoic acid is a carboxylic acid used in vinegar. A student adds a small piece of calcium carbonate to a sample of eth…](https://www.gradenine.co.uk/q/ethanoic-acid-is-a-carboxylic-acid-94df1566)
8. [A pharmaceutical company is developing a new painkiller from a plant extract. Before the medicine can be sold to the pub…](https://www.gradenine.co.uk/q/a-pharmaceutical-company-is-developing-a-98aa7418)

## Related

- [OCR A-Level Chemistry B: Salters (H433) revision notes](https://www.gradenine.co.uk/learn/ocr-a-level-chemistry-b-salters-h433)
- [OCR A-Level Chemistry B: Salters (H433) past papers](https://www.gradenine.co.uk/past-papers/ocr-a-level-chemistry-b-salters-h433)
- [Practise with AI marking (free)](https://www.gradenine.co.uk/start)