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9.1 The composition and evolution of the Earth's atmosphere

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Question 7

A computer model starts with an atmosphere containing oxygen, carbon dioxide, nitrogen and noble gases. The model then applies only the effect of photosynthesis by algae and plants over a long period.

Which change should the model show?

[1]
A

The amount of oxygen becomes greater and the amount of carbon dioxide becomes smaller

B

The amounts of oxygen and carbon dioxide both become greater

C

The amounts of oxygen and carbon dioxide both become smaller

D

The amount of oxygen becomes smaller and the amount of carbon dioxide becomes greater

Markscheme

9.1 The composition and evolution of the Earth's atmosphere Questions

  1. GCSE
  2. /Chemistry
  3. /9.1 The composition and evolution of the Earth's atmosphere

79 exam-style questions on AQA GCSE Chemistry 9.1 The composition and evolution of the Earth's atmosphere, covering 9.1.1 The proportions of different gases in the atmosphere, 9.1.2 The Earth's early atmosphere, 9.1.3 How oxygen increased, and 9.1.4 How carbon dioxide decreased. Each one has a worked solution and a mark scheme showing where the marks go.

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