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This question is about gases - AQA - GCSE Chemistry - Question 3 - 2018 - Paper 2
Question 3
This question is about gases. Figure 3 shows how nitrogen is used in the Haber Process to produce ammonia. Figure 3 Gas X in Figure 3 is obtained from methane. Nam... show full transcript
Worked Solution & Example Answer:This question is about gases - AQA - GCSE Chemistry - Question 3 - 2018 - Paper 2
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Explain the processes that led to these changes.
Answer
The changes in the percentages of carbon dioxide and oxygen in Earth's atmosphere are attributed to several processes:
- Volcanic Activity: Initially released water vapor.
- Water Vapor Condensation: This led to the formation of oceans.
- Carbon Dissolution: Carbon dioxide dissolved in oceans, reducing its atmospheric concentration.
- Sedimentation: Carbonates formed sediments that sequestered carbon dioxide.
- Photosynthesis: Algae and plants absorbed carbon dioxide and released oxygen, contributing to the present-day atmosphere.
- Carbon Locking: Carbon has also been locked up in fossil fuels, further reducing its atmospheric concentration.
Step 5
Why are scientists not certain about the percentage of each gas in the Earth’s early atmosphere?
Answer
Scientists are uncertain about the gas percentages in the Earth's early atmosphere because potential evidence is limited, and many assumptions have to be made due to a lack of direct data.