Which reaction profile shows an endothermic reaction with an activation energy of 75 kJ/mol?
| Energy of reactants (kJ/mol\mathrm{kJ/mol}kJ/mol) | Energy at the top of the peak (kJ/mol\mathrm{kJ/mol}kJ/mol) | Energy of products (kJ/mol\mathrm{kJ/mol}kJ/mol) | |
|---|---|---|---|
| A | 60 | 135 | 30 |
| B | 20 | 125 | 50 |
| C | 30 | 105 | 60 |
| D | 10 | 75 | 40 |
Profile A
Profile B
Profile C
Profile D
51 exam-style questions on OCR GCSE Chemistry 3.2 Energetics, covering 3.2.1 Exothermic and endothermic reactions and reaction profiles and 3.2.2 Calculating energy change from bond energies. Each one has a worked solution and a mark scheme showing where the marks go.