AQA•A-Level•Chemistry
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Energetics
Enthalpy changes, Hess's law, and bond enthalpies
Practice 23 subtopics in Energetics. All questions match the AQA A-Level specification.
About Energetics
Energetics is a key topic in the AQA A-Level Chemistryspecification. This topic covers enthalpy changes, hess's law, and bond enthalpies.
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Enthalpy change definitionExothermic and endothermic reactionsStandard enthalpy changesStandard conditions (298 K, 100 kPa)Enthalpy of combustion ΔcHEnthalpy of formation ΔfHEnthalpy of neutralisation ΔneutHEnthalpy of atomisation ΔatHq = mcΔT calculationsSpecific heat capacityCalorimetry experimentsEnthalpy change from calorimetry dataSources of error in calorimetryHess's Law statementEnthalpy cyclesUsing Hess's Law for calculationsCalculating ΔrH from ΔfH valuesCalculating ΔrH from ΔcH valuesBond enthalpy definitionMean bond enthalpyUsing bond enthalpies to calculate ΔrHLimitations of bond enthalpy calculationsBond enthalpy and bond strength
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