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9.1 The composition and evolution of the Earth's atmosphere

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Question 11

A gas-mixing apparatus has four oxygen settings: 20%, 25%, 50% and 79%. The apparatus is used to prepare a mixture with the same approximate proportion of oxygen as clean, dry air.

What percentage of oxygen should be selected?

[1]
A

25%25\%25%

B

79%79\%79%

C

50%50\%50%

D

20%20\%20%

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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