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9.1 The composition and evolution of the Earth's atmosphere

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Question 8

A student measured the percentages of three gases in air collected above a warm ocean and in cold, dry air inland.

GasWarm ocean air (%)Cold, dry air (%)
Nitrogen76.577.9
Oxygen20.520.9
Water vapour2.00.2

Compare the percentages of the gases in the two samples and explain the differences.

[3]
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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