A student carries out an experiment to determine the enthalpy of combustion of liquid ethanol (C2H5OH\text{C}_2\text{H}_5\text{OH}C2H5OH).
They use a spirit burner containing ethanol, positioned below a clamped copper calorimeter containing 150 g150\text{ g}150 g of water.
Answer the following questions based on this experiment:
Design a table to record all the raw measurements necessary to determine the experimental enthalpy of combustion of ethanol in this experiment.
The student considered using a standard glass beaker supported on a tripod and gauze instead of the clamped copper calorimeter. Suggest two disadvantages of using a glass beaker on a tripod and gauze.
Suggest two reasons why the experimental value of the enthalpy of combustion obtained from this setup is likely to be less exothermic than the standard literature value.
Suggest one modification or addition to this apparatus that would improve the accuracy of the value obtained.
34 exam-style questions on AQA A Level Chemistry Energetics, covering Enthalpy change, Calorimetry, Applications of Hess's law, and Bond enthalpies. Each one has a worked solution and a mark scheme showing where the marks go.