The amounts of some gases in the Earth's early atmosphere are shown on the bar chart - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Question 2
The amounts of some gases in the Earth's early atmosphere are shown on the bar chart.
(a) Complete the sentence by putting a cross (✔) in the box next to your answe... show full transcript
Worked Solution & Example Answer:The amounts of some gases in the Earth's early atmosphere are shown on the bar chart - Edexcel - GCSE Chemistry - Question 2 - 2012 - Paper 1
Step 1
Complete the sentence by putting a cross (✔) in the box next to your answer.
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Answer
The earth’s earliest atmosphere was formed by D volcanoes erupting. This is because volcanic activity released gases, including carbon dioxide and water vapour, into the atmosphere.
Step 2
Explain how the amount of water in the Earth’s atmosphere decreased.
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Answer
The amount of water in the Earth's atmosphere decreased due to condensation and precipitation. As the Earth cooled, water vapour condensed to form liquid water, which fell as rain, leading to the accumulation of water in oceans and other bodies of water.
Step 3
Explain why burning methane changes the amounts of gases in the atmosphere.
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Answer
Burning methane produces carbon dioxide and water vapour. This reaction consumes oxygen and increases the concentration of carbon dioxide in the atmosphere, thus altering the balance of gases.
Step 4
state two other activities that affect the amounts of gases in the atmosphere.
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Answer
Farming/animals release methane into the atmosphere.
Deforestation/cutting down trees reduces the number of plants capable of photosynthesis, leading to higher carbon dioxide levels.
