A researcher investigated the heat energy released by burning different types of biomass pellets in a combustion calorimeter. The results are recorded in the table below.
| Biomass Pellet Type | Mass of pellet burned / g | Temperature rise / °C |
|---|---|---|
| Douglas Fir | 1.50 | 32.4 |
| Wheat Straw | 1.50 | 18.6 |
Explain, using only the information in the table, why Douglas Fir is the more efficient fuel.
94 exam-style questions on Edexcel GCSE Chemistry 8.2 Heat energy changes in chemical reactions, covering 8.2.1 Exothermic and endothermic changes, 8.2.2 Bond breaking, bond making and overall energy change, 8.2.3 Calculating energy change from bond energies, and 8.2.4 Activation energy and reaction profiles. Each one has a worked solution and a mark scheme showing where the marks go.