5.2 - Calculation of enthalpy changes
5.2.1: Calculate the heat change when the temperature of a pure substance is altered.
Students should be able to calculate the heat change for a substance given the mass, specific heat capacity and the temperature change, ΔT.
5.2.2: Design suitable experimental procedures for measuring the heat energy changes of reactions. Students should consider reactions in aqueous solutions and combustion reactions. Use of the bomb calorimeter and calibration of calorimeters will not be assessed.
5.2.3: Calculate the enthalpy change for a reaction in aqueous solution using experimental data on temperature changes, quantities of reactants and mass of solution. Enthalpy changes of an acid-base reaction could be investigated.
5.2.4: Evaluate the results of experiments to determine enthapy changes. Students should be aware of the assumptions made and errors due to heat loss.