Citric acid solution is added to sodium hydrogencarbonate. The temperature of the mixture falls from 21 ∘C21\ ^\circ\text{C}21 ∘C to 15 ∘C15\ ^\circ\text{C}15 ∘C. Which statement about this reaction is correct?
It is exothermic, and energy is taken in from the surroundings
It is endothermic, and energy is taken in from the surroundings
It is exothermic, and the products store less energy than the reactants
It is endothermic, and the products store less energy than the reactants
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.