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GCSE AQA Chemistry: Topic 9- Chemistry of the Atmosphere Rated A+

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GCSE AQA Chemistry: Topic 9- Chemistry of the Atmosphere Rated A+ 1. What is the composition of the current atmosphere? Answer: The current atmosphere consists of approximately 80% nitrogen, 20% oxygen, 0.04% carbon dioxide, and 0.9% argon. 2. How was the early atmosphere formed? Answer: ...

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  • July 11, 2024
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  • 2023/2024
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  • gcse aqa chemistry topic 9 chemistry of the atmo

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GCSE AQA Chemistry: Topic 9- Chemistry of the Atmosphere Rated A+
1. What is the composition of the current atmosphere?



Answer: The current atmosphere consists of approximately 80% nitrogen, 20% oxygen, 0.04% carbon
dioxide, and 0.9% argon.



2. How was the early atmosphere formed?



Answer: The early atmosphere was formed through frequent volcanic eruptions that released gases such
as carbon dioxide, methane, ammonia, and water vapor.



3. What were the main gases in the early atmosphere?



Answer: The main gases in the early atmosphere were carbon dioxide, methane, ammonia, and water
vapor.



4. How did oxygen levels increase?



Answer: Oxygen levels increased as a result of the evolution of plants, which absorbed carbon dioxide
and converted it into oxygen through photosynthesis.



5. How did carbon dioxide levels decrease?



Answer: Carbon dioxide levels decreased as it was absorbed by plants for use in photosynthesis and
dissolved into oceans, eventually becoming locked up in sedimentary rocks and fossil fuels.



6. How did nitrogen levels increase?



Answer: Nitrogen levels increased as a result of the reaction between ammonia and oxygen, which
produced nitrogen gas and water.

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