Two reactions have the same reactants and the same products. Reaction 1 has an activation energy of 55 kJ/mol. Reaction 2 has an activation energy of 120 kJ/mol.
Give what is meant by the activation energy.
A student says that reaction 2 must have a larger overall energy change than reaction 1. Explain why the student is wrong.
The products of these reactions store more energy than the reactants. Give the sign of the overall energy change.
39 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.