A student investigates the temperature fall when citric acid reacts with sodium hydrogencarbonate solution. The student does the experiment twice, using the same amounts of the same chemicals each time. The first time, the reaction is carried out in an uncovered glass beaker. The second time, it is carried out in an insulated flask fitted with a stopper.
Explain how using the insulated flask with a stopper affects the temperature fall the student measures.
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.