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6.3 Interpreting and interacting with earth systems

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Question 6
F

The percentage of nitrogen in the atmosphere has increased from about 5% in the early atmosphere to 78% today.

A student says: "This shows that a large amount of nitrogen must have been added to the atmosphere."

Which is the best evaluation of the student's statement?

[1]
A

The student is correct, because the percentage of a gas can only increase if more of that gas is added.

B

The student may not be correct, because the percentage of nitrogen would increase if other gases were removed, even if no nitrogen was added.

C

The student is not correct, because nitrogen was converted into carbon dioxide over time.

D

The student is correct, because plants release nitrogen during photosynthesis.

Markscheme

6.3 Interpreting and interacting with earth systems Questions

  1. GCSE
  2. /Chemistry
  3. /6.3 Interpreting and interacting with earth systems

51 exam-style questions on OCR GCSE Chemistry 6.3 Interpreting and interacting with earth systems, covering 6.3.1 Formation and evolution of the atmosphere, 6.3.2 The greenhouse effect and climate change, 6.3.3 Sources and problems of atmospheric pollutants, and 6.3.4 Producing potable water. Each one has a worked solution and a mark scheme showing where the marks go.

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