A student plans two tests using hydrochloric acid and sodium hydroxide solution. In Test 1, the mixture will be stirred gently. In Test 2, the mixture will not be stirred. The volumes and concentrations of the solutions and their starting temperatures will be the same in both tests. Polystyrene cups, glass beakers and lids are available. The student will compare the highest temperatures recorded. Which choice of apparatus should the student use to complete a fair test?
Use a lidded polystyrene cup in Test 1 and a lidded glass beaker in Test 2.
Use an open glass beaker in Test 1 and a lidded glass beaker in Test 2.
Use a lidded polystyrene cup in Test 1 and an open polystyrene cup in Test 2.
Use a lidded polystyrene cup in Test 1 and another lidded polystyrene cup in Test 2.
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.