Four gas samples were placed in identical sealed cells. Each cell contained the same amount of gas. Infrared radiation of the same intensity was directed through each cell. Any radiation that was not transmitted was absorbed by the gas.
| Gas sample | Infrared radiation transmitted (%) |
|---|---|
| P | 99 |
| Q | 64 |
| R | 96 |
| S | 98 |
Give the letter of the gas sample most likely to contribute to the greenhouse effect. Explain your answer.
The proportion of gas Q in the atmosphere increases. Explain how this is likely to affect the average temperature at the Earth's surface.
73 exam-style questions on AQA GCSE Chemistry 9.2 Carbon dioxide and methane as greenhouse gases, covering 9.2.1 Greenhouse gases, 9.2.2 Human activities which contribute to an increase in greenhouse gases in the, 9.2.3 Global climate change, and 9.2.4 The carbon footprint and its reduction. Each one has a worked solution and a mark scheme showing where the marks go.