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9.1 The composition and evolution of the Earth's atmosphere

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Question 10

Algae growing in a pond carry out photosynthesis. A student is writing the balanced symbol equation for this process. She writes a coefficient of 1 in front of C6H12O6\text{C}_6\text{H}_{12}\text{O}_6C6​H12​O6​ and chooses each of the other coefficients from 1, 2, 6 and 12.

Which coefficient should she write in front of O2\text{O}_2O2​?

[1]
A

222

B

121212

C

666

D

111

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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