Three alkanes are being considered as fuels for a portable burner.
The burner pumps fuel through a heated chamber. The fuel supply must be at least 10 cm³ per minute. The chamber can reach a maximum temperature of 160 ∘C160\ ^\circ\text{C}160 ∘C and must boil the fuel so that it mixes with oxygen.
The table shows data for the three fuels.
| Fuel | Number of carbon atoms in each molecule | Boiling point in ∘C^\circ\text{C}∘C | Flow rate through the pump in cm³ per minute |
|---|---|---|---|
| L | 7 | 98 | 15 |
| M | 10 | 174 | 9 |
| N | 14 | 254 | 4 |
Suggest which fuel should be used in the burner. Explain your answer.
Fuel L burns completely in oxygen.
Complete and balance the symbol equation for this reaction.
................ + O2→\text{O}_2 \rightarrowO2→ ................ + ................
91 exam-style questions on AQA GCSE Chemistry 7.1 Carbon compounds as fuels and feedstock, covering 7.1.1 Crude oil, hydrocarbons and alkanes, 7.1.2 Fractional distillation and petrochemicals, 7.1.3 Properties of hydrocarbons, and 7.1.4 Cracking and alkenes. Each one has a worked solution and a mark scheme showing where the marks go.