GCSE Edexcel Chemistry The Atmosphere: 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

Identify the correct option for part (a)

Explain, using the data, the identity of gas X

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