Citric acid solution and sodium hydrogencarbonate are mixed in an insulated cup. The thermometer reading falls from 21.0 °C to 15.5 °C.
Give whether the reaction is exothermic or endothermic.
Describe how energy moves between the reacting chemicals and the surroundings.
Name another type of reaction that would cause the same direction of temperature change as the reaction in the cup.
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.