1. 21. Energetics 2Key concepts covered on Energetics 1: 1. Enthalpy change definitions: atomisation of elements (and compounds), bond energy, ionisation energy, electron affinity, lattice energy, hydration and solution, focusing on the energy change and reference. 2. Calorimetric Method focusing on: Assumptions - Temperature change via simple measurement or correction of heat loss to surrounding - Heat change, q in J - Enthalpy change in kJ/mol - Experimental efficiency Here is a bomb calorimeter consisting of a bomb chamber inside a second chamber of water: The water is stirred and there is a thermometer that measures the water temperature. The test material is placed inside the bomb chamber and ignited by electric leads. The entire system is encased in one or two layers of insulation to ensure that the heat released by the combustion reaction does not escape to the surroundings and is entirely absorbed by the calorimeter.