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9.1 The composition and evolution of the Earth's atmosphere

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Question 22
H

The percentage of carbon dioxide in the Earth's atmosphere fell from 20% to 0.040%. By what factor did the percentage of carbon dioxide fall?

[1]
A

200

B

500

C

2000

D

5000

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

40 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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