# "Describe and explain" questions — Pearson Edexcel International GCSE Chemistry (4CH1)

> 8 questions · chemistry

## How to answer

"describe and explain" questions from Pearson Edexcel International GCSE Chemistry (4CH1). Read the rubric carefully — the marking points cluster into scientific ideas rather than free-form prose.

## Sample questions

1. [Chlorine, bromine and iodine are all halogens in Group 7 of the periodic table. Describe and explain the trend in reacti…](https://www.gradenine.co.uk/q/chlorine-bromine-and-iodine-are-all-0c0601ab)
2. [Ethene undergoes an addition reaction with bromine water. Describe what is observed when ethene is bubbled through bromi…](https://www.gradenine.co.uk/q/ethene-undergoes-an-addition-reaction-with-2f3694c8)
3. [Crude oil is a finite resource that is separated into useful fractions by fractional distillation. Describe how fraction…](https://www.gradenine.co.uk/q/crude-oil-is-a-finite-resource-3211821c)
4. [Graphite and diamond are both giant covalent structures made entirely of carbon atoms, yet they have very different prop…](https://www.gradenine.co.uk/q/graphite-and-diamond-are-both-giant-751015c5)
5. [Addition polymerisation is used to make poly(ethene) from ethene monomers. Describe the process of addition polymerisati…](https://www.gradenine.co.uk/q/addition-polymerisation-is-used-to-make-adadc3e5)
6. [Copper is a metal used to make electrical wiring. It has a giant metallic structure consisting of a lattice of positive …](https://www.gradenine.co.uk/q/copper-is-a-metal-used-to-b600ba13)
7. [Describe the trend in reactivity of the alkali metals as you go down Group 1, and explain this trend in terms of atomic …](https://www.gradenine.co.uk/q/describe-the-trend-in-reactivity-of-c7d15c93)
8. [Describe the natural greenhouse effect and explain why an increase in the concentration of greenhouse gases in the atmos…](https://www.gradenine.co.uk/q/describe-the-natural-greenhouse-effect-and-d4990611)

## Related

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