Chemistry path · GCSE Chemistry

Can two fractions describe every gas in the atmosphere?

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Practice question

A planetarium audio guide states that, for about 200 million years, the atmosphere has been about four-fifths nitrogen and one-fifth oxygen. Explain why this is a summary rather than a complete list of the gases present.

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Official curriculum

4.9.1.1 The proportions of different gases in the atmosphere

This challenge practises knowledge and exam skills from the official GCSE science curriculum. Use these sources to see the exact subject content and its wider Key Stage 4 context.

AQA specification 4.9.1.1 The proportions of different gases in the atmosphere GOV.UK Key Stage 4 science programme

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