# "Describe and explain" questions — Cambridge International IGCSE Chemistry (0620)

> 28 questions · chemistry

## How to answer

"describe and explain" questions from Cambridge International IGCSE Chemistry (0620). Read the rubric carefully — the marking points cluster into scientific ideas rather than free-form prose.

## Sample questions

1. [Describe how galvanising protects iron from rusting, and explain why this protection continues even if the zinc coating …](https://www.gradenine.co.uk/q/describe-how-galvanising-protects-iron-from-0e33bf09)
2. [Describe the structure and bonding in diamond, and explain why diamond does not conduct electricity.](https://www.gradenine.co.uk/q/describe-the-structure-and-bonding-in-17505427)
3. [Ethanoic acid is a carboxylic acid found in vinegar. Describe the reaction of ethanoic acid with sodium carbonate soluti…](https://www.gradenine.co.uk/q/ethanoic-acid-is-a-carboxylic-acid-193f9ba4)
4. [Describe what an alloy is and explain why alloys are generally harder than pure metals.](https://www.gradenine.co.uk/q/describe-what-an-alloy-is-and-1fc4ade5)
5. [Chlorine water is added to a solution of potassium bromide and then to a separate solution of potassium iodide. Describe…](https://www.gradenine.co.uk/q/chlorine-water-is-added-to-a-43721df7)
6. [Methane is the simplest alkane. Describe what happens when methane reacts with chlorine in the presence of ultraviolet l…](https://www.gradenine.co.uk/q/methane-is-the-simplest-alkane-describe-49fea31c)
7. [Describe how the reactivity and melting point of the Group I metals change as you go down the group from lithium to caes…](https://www.gradenine.co.uk/q/describe-how-the-reactivity-and-melting-4ac6b2f4)
8. [A student reacts calcium oxide with dilute hydrochloric acid and separately reacts calcium oxide with water. Describe wh…](https://www.gradenine.co.uk/q/a-student-reacts-calcium-oxide-with-5942b0fe)

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