Table 1 shows the estimated percentages of different gases in the Earth's primeval atmosphere compared with the atmosphere today.
| Gas | Percentage (%) in Earth's primeval atmosphere | Percentage (%) in today's atmosphere |
|---|---|---|
| Gas R | 95.5 | 0.04 |
| nitrogen | 3.2 | 78.1 |
| oxygen | <0.05 | 20.9 |
| argon | <0.1 | 0.93 |
| water vapour | 1.0 | <0.1 |
Explain, using the data in Table 1, the identity of Gas R.
Practise Edexcel GCSE Chemistry Earth and atmospheric science with exam-style questions for Foundation and Higher tier. 62 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
