The table gives energy values from the reaction profiles for a reaction with and without a catalyst.
| Point on reaction profile | Energy in kJ |
|---|---|
| reactants | 50 |
| highest point, no catalyst | 230 |
| highest point, with catalyst | 160 |
| products | -40 |
Which row gives the activation energy and the overall energy change for the catalysed reaction?
activation energy 160 kJ160\,\mathrm{kJ}160kJ; overall energy change −90 kJ-90\,\mathrm{kJ}−90kJ
activation energy 110 kJ110\,\mathrm{kJ}110kJ; overall energy change −90 kJ-90\,\mathrm{kJ}−90kJ
activation energy 70 kJ70\,\mathrm{kJ}70kJ; overall energy change −90 kJ-90\,\mathrm{kJ}−90kJ
activation energy 110 kJ110\,\mathrm{kJ}110kJ; overall energy change +90 kJ+90\,\mathrm{kJ}+90kJ
54 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.