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The pie charts show the likely composition of the atmosphere 2.5 billion years ago and what its composition is today - Edexcel - GCSE Chemistry - Question 4 - 2012 - Paper 1
Question 4
The pie charts show the likely composition of the atmosphere 2.5 billion years ago and what its composition is today. Gas X is A chlorine B hydrogen C nitrogen ... show full transcript
Worked Solution & Example Answer:The pie charts show the likely composition of the atmosphere 2.5 billion years ago and what its composition is today - Edexcel - GCSE Chemistry - Question 4 - 2012 - Paper 1
Step 1
Complete the sentence by putting a cross (X) in the box next to your answer.
Answer
Gas X is likely to be Hydrogen (B). This conclusion is drawn from the knowledge that early atmospheres, such as Earth's, were believed to be rich in hydrogen and other gases, and the current atmosphere has a significant amount of oxygen due to photosynthesis.