A reaction mixture is stirred in a flask. While the reaction occurs, the flask and nearby air become cooler. Which statement correctly compares the energy of the products with the energy of the reactants?
The products have more energy than the reactants because energy was taken in from the surroundings
The products have less energy than the reactants because energy was transferred to the surroundings
The products have the same energy as the reactants because energy is conserved
The products have less energy than the reactants because energy was taken in from the surroundings
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.