A research team tests an aircraft engine that burns a hydrocarbon fuel.
The table shows the concentration of oxides of nitrogen in the exhaust at different temperatures inside the engine.
| Temperature inside the engine (°C) | Concentration of oxides of nitrogen (ppm) |
|---|---|
| 1200 | 15 |
| 1500 | 65 |
| 1800 | 180 |
Explain the pattern in the results.
In a further test, the gas drawn into the engine contains oxygen but no nitrogen. The temperature inside the engine is kept at 1800 °C.
Explain how this change would affect the concentration of oxides of nitrogen in the exhaust.
102 exam-style questions on AQA GCSE Chemistry 9.3 Common atmospheric pollutants and their sources, covering 9.3.1 Atmospheric pollutants from fuels and 9.3.2 Properties and effects of atmospheric pollutants. Each one has a worked solution and a mark scheme showing where the marks go.