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9.1 The composition and evolution of the Earth's atmosphere

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Question 12

Algae grow in a rock pool in bright light. The air above the pool contains carbon dioxide, oxygen and nitrogen.

Which change in the proportions of these gases is expected while the algae photosynthesise?

[1]
A

Carbon dioxide increases and oxygen decreases

B

Carbon dioxide decreases and oxygen increases

C

Carbon dioxide decreases and nitrogen increases

D

Carbon dioxide decreases and oxygen stays the same

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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