AQA · Chemistry · 8462
GCSE Chemistry: The proportions of different gases in the atmosphere
Chemistry of the atmosphere · AQA GCSE Chemistry (8462), specification point 4.9.1.1. Cards are generated from the exam board's own specification for "The proportions of different gases in the atmosphere", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Approximately what percentage of the atmosphere is nitrogen?
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About 80% (roughly four-fifths).
Approximately what percentage of the atmosphere is oxygen?
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About 20% (roughly one-fifth).
Which gas makes up about four-fifths of the atmosphere?
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Nitrogen.
Which gas makes up about one-fifth of the atmosphere?
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Oxygen.
For roughly how long have the proportions of gases in the atmosphere been much the same as today?
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About 200 million years.
The proportions of gases in the atmosphere have stayed much the same for about ? years.
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200 million
Name one gas present in the atmosphere in only small proportions.
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Carbon dioxide (also water vapour or the noble gases, e.g. argon).
Is carbon dioxide a major or minor component of today's atmosphere?
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Minor — it is present in only a small proportion, alongside water vapour and noble gases.
What fraction of the atmosphere is nitrogen, expressed as a fraction?
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About four-fifths (4/5).
What is the approximate ratio of nitrogen to oxygen in the atmosphere?
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About 4 : 1 (80% nitrogen to 20% oxygen).
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