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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
Step 2
Explain how the amount of water in the Earth's atmosphere decreased.
Answer
The amount of water in the Earth's atmosphere decreased due to the cooling of the planet. As the Earth cooled, water vapor condensed to form liquid water, leading to the formation of oceans. This process removed water vapor from the atmosphere.
Step 3
Explain why burning methane changes the amounts of gases in the atmosphere.
Answer
Burning methane increases the levels of carbon dioxide in the atmosphere. The reaction releases carbon dioxide and water vapor, which adds to the greenhouse gases influencing climate change, thereby altering the composition of atmospheric gases.
Step 4
Apart from burning fossil fuels, state two other activities that affect the amounts of gases in the atmosphere.
Answer
- Farming/animals release methane through digestion and waste.
- Deforestation or cutting down trees reduces the number of plants available to absorb carbon dioxide, thus increasing its concentration in the atmosphere.