DF Section 1 (a), (d), 9 hours PAG 3 Enthalpy Main chemical thermochemistry – – – (f), (g) determination (experiments A statement of Hess' law is not required, but to measure the energy The use of in cars calculations using the law are. transferred when reactions provides the main context Molar gas volume and the gas constant are occur in solution or when in this storyline, and is used given on the . flammable liquids burn). to initially introduce the Molar volume is given to three significant basic concept of enthalpy Calculation of enthalpy figures (24.0 dm3 mol–1 at RTP), and the gas change. Food as for changes from experimental ‘fuel’ constant to four significant figures (8.314 the body is then an techniques (HSW2). J mol–1 K–1). alternative context in which Accurate use of the following terms will be to discuss quantitative required: exothermic, endothermic, standard aspects of enthalpy, (standard) conditions, enthalpy change of including practical reaction (rH), (standard) enthalpy change of techniques and enthalpy combustion (cH), (standard) enthalpy change cycles. of formation (fH), (standard) enthalpy change of neutralisation (neutH).
DF – Section 1 – (a), (d), (f), (g) The use of in cars provides the main context in this storyline, and is used to initially introduce the basic concept of enthalpy change. Food as ‘fuel’ for the body is then an alternative context in which to discuss quantitative aspects of enthalpy, including practical techniques and enthalpy cycles. 9 hours PAG 3 – Enthalpy determination (experiments to measure the energy transferred when reactions occur in solution or when flammable liquids burn). Calculation of enthalpy changes from experimental techniques (HSW2). Main chemical thermochemistry A statement of Hess' law is not required, but calculations using the law are. Molar gas volume and the gas constant are given on the . Molar volume is given to three significant figures (24.0 dm3 mol–1 at RTP), and the gas constant to four significant figures (8.314 J mol–1 K–1). Accurate use of the following terms will be required: exothermic, endothermic, standard conditions, (standard) enthalpy change of reaction (rH), (standard) enthalpy change of combustion (cH), (standard) enthalpy change of formation (fH), (standard) enthalpy change of neutralisation (neutH).
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