The energy transfers for a reaction are shown in the table.
| Process | Energy transfer |
|---|---|
| Breaking bonds in the reactants | 720 kJ/mol taken in |
| Making bonds in the products | 610 kJ/mol released |
Which conclusion about the reaction is correct?
Energy is transferred into the reacting chemicals overall, so the reaction is endothermic
The reaction is exothermic because energy is released when product bonds form
The reaction is endothermic because its products have less energy than its reactants
Energy is transferred out of the reacting chemicals overall, so the reaction is exothermic
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.