GCSE Edexcel Chemistry Greenhouse Gases: The Earth's early atmosphere was

Question

The Earth's early atmosphere was different from that of the Earth's atmosphere today.

(a) The Earth's early atmosphere was formed by

☐ A animals breathing.
☐ B global warming.
☐ C plants growing.
☐ D volcanic activity.

(b) Figure 1 shows some data about the composition of gases present in the Earth's early atmosphere and today's atmosphere.

| gas             | Earth’s early atmosphere | today’s atmosphere |
|------------------|-------------------------|-------------------|
| nitrogen         | 4                       | 78                |
| oxygen           | <0.01                   | 21                |
| argon            | <0.01                   | 0.9               |
| gas X           | 95                      | 0.04              |
| ammonia          | 0.5                     | <0.001            |
| sulfur dioxide    | 0.5                     | <0.001            |

Figure 1

Explain, using the data, the identity of gas X.

The Earth's early atmosphere was different from that of the Earth's atmosphere today - Edexcel - GCSE Chemistry - Question 1 - 2016 - Paper 1

Worked Solution & Example Answer:The Earth's early atmosphere was different from that of the Earth's atmosphere today - Edexcel - GCSE Chemistry - Question 1 - 2016 - Paper 1

(a) The Earth's early atmosphere was formed by

(b) Explain, using the data, the identity of gas X.

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