The table shows energy levels from the reaction profiles of reactions R and S.
| Reaction | Energy level of reactants in kJ | Energy level at peak in kJ | Energy level of products in kJ |
|---|---|---|---|
| R | 70 | 150 | 30 |
| S | 110 | 190 | 90 |
Which statement is correct?
The activation energies are equal, but reaction R transfers more energy to the surroundings than reaction S.
Reaction R is endothermic, but reaction S is exothermic.
Reaction S has a greater activation energy because its peak is at a higher energy level.
Both reactions transfer the same amount of energy to the surroundings because their activation energies are equal.
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.