In a laboratory investigation, a student burned exactly 1.0 g samples of different alcohols to heat 100 cm3 of water in a copper calorimeter. They recorded the temperature rise of the water for each alcohol.
| Alcohol | Number of carbon atoms in one molecule | Temperature rise of water in °C |
|---|---|---|
| ethanol | 2 | 18.5 |
| propanol | 3 | 24.0 |
| butanol | 4 | 28.0 |
| pentanol | 5 | 31.0 |
| hexanol | 6 | 33.0 |
Draw a graph of the temperature rise of the water against the number of carbon atoms in one molecule of the alcohol.
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.