The two most common gases in today's atmosphere are nitrogen and oxygen - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2020 - Paper 1
Question 1
The two most common gases in today's atmosphere are nitrogen and oxygen.
(a) (i) What is the third most common gas in today's atmosphere?
A argon
B butane
C chlorin... show full transcript
Worked Solution & Example Answer:The two most common gases in today's atmosphere are nitrogen and oxygen - Edexcel - GCSE Chemistry Combined Science - Question 1 - 2020 - Paper 1
Step 1
What is the third most common gas in today's atmosphere?
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Answer
The third most common gas in today's atmosphere is A argon.
Step 2
What is the percentage of oxygen in today's atmosphere?
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Answer
The percentage of oxygen in today's atmosphere is B 21.
Step 3
Give the name of the most common gas in the Earth's early atmosphere.
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Answer
The most common gas in the Earth's early atmosphere was carbon dioxide.
Step 4
Explain what caused the amount of water vapour in the atmosphere to decrease.
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Answer
The amount of water vapour in the atmosphere decreased primarily due to the cooling of the Earth. As the planet cooled, water vapour condensed to form oceans, reducing the water vapour content in the atmosphere.
