The pie chart shows the percentages of the three most abundant gases in the Earth's atmosphere today - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Question 2
The pie chart shows the percentages of the three most abundant gases in the Earth's atmosphere today.
What is the percentage of oxygen in the atmosphere?
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Worked Solution & Example Answer:The pie chart shows the percentages of the three most abundant gases in the Earth's atmosphere today - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Step 1
What is the percentage of oxygen in the atmosphere?
96%
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Answer
From the pie chart, we can observe that oxygen occupies a significant portion. The correct percentage of oxygen in the atmosphere is 21%. Therefore, the appropriate option to choose is C: 21%.
Step 2
Which of the following caused the amount of oxygen to increase?
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Answer
In the Earth's early atmosphere, there was very little oxygen. The process that primarily contributed to the increase of oxygen was photosynthesis in plants. Thus, the correct choice is B: photosynthesis in plants.
