A solid fuel tablet burns in oxygen. The tablet only starts to burn when a flame is held against it.
The table shows energy levels on the reaction profile for this reaction.
| Position on the reaction profile | Energy (kJ/mol\text{kJ/mol}kJ/mol) |
|---|---|
| Reactants | 2150 |
| Top of the peak | 2300 |
| Products | 100 |
Calculate the activation energy for this reaction.
Calculate the energy transferred to the surroundings per mole when the fuel burns.
Explain why a flame is needed to start the reaction, even though the reaction transfers energy to the surroundings.
106 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.