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9.1 The composition and evolution of the Earth's atmosphere

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Question 20

A computer model represents a sample of clean, dry air using 7500 particles.

Information about the modelValue
Particles that are nitrogen or oxygen99%
Ratio of nitrogen particles to oxygen particles4 : 1

Calculate the number of nitrogen particles in the model.

[2]
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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