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The table shows the composition of the current atmospheres of four planets, W, X, Y and Z - Edexcel - GCSE Chemistry - Question 1 - 2018 - Paper 1
Question 1
The table shows the composition of the current atmospheres of four planets, W, X, Y and Z. Gases that form less than one per cent of the atmosphere of a planet are n... show full transcript
Worked Solution & Example Answer:The table shows the composition of the current atmospheres of four planets, W, X, Y and Z - Edexcel - GCSE Chemistry - Question 1 - 2018 - Paper 1
Step 1
Which of the planets is Earth?
Answer
To determine which planet corresponds to Earth, we can analyze the atmospheric composition of each planet listed in the table. Earth’s atmosphere is primarily composed of nitrogen and oxygen, with significant amounts of argon and carbon dioxide.
Here’s the breakdown:
- Planet W:
- Nitrogen: 33%
- Oxygen: 2%
- Argon: 3%
- Planet X:
- Nitrogen: 2%
- Oxygen: 21%
- Argon: 2%
- Planet Y:
- Nitrogen: 0%
- Oxygen: 42%
- Argon: 1%
- Planet Z:
- Nitrogen: 0%
- Oxygen: 30%
- Argon: 0%
Planet Y shows the highest oxygen content (42%), which is most similar to the composition of Earth's atmosphere. Thus, the answer is:
Planet Y.