A laboratory team is testing a reaction before using it in a process. The relative energy levels for the reaction are shown.
| Stage of reaction | Relative energy (kJ/mol) |
|---|---|
| Reactants | 120 |
| Peak | 205 |
| Products | 75 |
Calculate the activation energy and the overall energy change for the reaction.
The team gives the mixture a brief input of energy to start the reaction. Explain why this does not show that the reaction is endothermic, and state how the temperature of the surroundings changes as the reaction proceeds.
85 exam-style questions on AQA GCSE Chemistry 5.1 Exothermic and endothermic reactions, covering 5.1.1 Energy transfer during exothermic and endothermic reactions, 5.1.2 Reaction profiles, and 5.1.3 The energy change of reactions. Each one has a worked solution and a mark scheme showing where the marks go.