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9.1 The composition and evolution of the Earth's atmosphere

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Question 16
H

The percentage of nitrogen in the atmosphere rose from a very low value to about 80%. Which explanation for this rise is correct?

[1]
A

Nitrogen was released by algae as a waste product of photosynthesis

B

Nitrogen was produced when ammonia dissolved in the early oceans

C

Nitrogen was released when carbonates were precipitated as sediments

D

Nitrogen was released by volcanoes while other gases were removed

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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