CHAPTER 7 Energetics (9 hours) – 1 Enthalpy change 3.1.4.1 Enthalpy change 7.1 7.2 Reactions can be endothermic Recap energy level describe reactions as endothermic or 7.3 or exothermic. diagrams and introduce exothermic 7.4 the idea of enthalpy. explain that enthalpy change (ΔH) is the Enthalpy change (ΔH) is the Define standard energy transferred by heating or heat energy change measured enthalpies of cooling, measured under conditions of under conditions of constant combustion and constant pressure pressure. formation and use them define standard enthalpy of to calculate relative combustion (ΔcHƟ) and standard Standard enthalpy changes molecular mass. enthalpy of formation (ΔfHƟ) to standard conditions, i.e. 100 kPa and a stated temperature (e.g. ΔH298Ɵ). Students should be able to define: standard enthalpy of combustion (ΔcH standard Ɵ); enthalpy of formation (ΔfH Ɵ). 2 Calorimetry 7.5 3.1.4.2 Required Calorimetry practical 2: Measurement of an The heat change, q, in a ideas of finding the Describe how calorimetry can be used enthalpy change. reaction is given by the energy of burning fuels. to measure the of methanol ΔcHƟ equation q = mcΔT. Use calorimetry to use q = mcΔT to calculate the molar investigate and evaluate enthalpy change for a reaction using Where m is the mass of the the enthalpy of data collected by calorimetry substance that has a combustion of Evaluate calorimetric methods and temperature change and a ΔT methanol. make suggestions for improvement specific heat capacity c. 3 Enthalpy of solution 7.5 Required practical Students should be able to: use activity 2: this equation to calculate the out experiments to describe dissolution as an endothermic Measurement of an molar enthalpy change for a measure the enthalpy of or exothermic process enthalpy change. reaction; use this equation in solution of a range of explain how to and carry out Student Book 7.5 related calculations. different solids experiments to determine enthalpy page 152 change of solution Students will not be use q = mcΔT to calculate the enthalpy expected to recall the value change of solution
CHAPTER 7 – Energetics (9 hours) 1 Enthalpy change Recap energy level diagrams and introduce the idea of enthalpy. Define standard enthalpies of combustion and formation and use them to calculate relative molecular mass. describe reactions as endothermic or exothermic explain that enthalpy change (ΔH) is the energy transferred by heating or cooling, measured under conditions of constant pressure define standard enthalpy of combustion (ΔcHƟ) and standard enthalpy of formation (ΔfHƟ) 3.1.4.1 Enthalpy change Reactions can be endothermic or exothermic. Enthalpy change (ΔH) is the heat energy change measured under conditions of constant pressure. Standard enthalpy changes to standard conditions, i.e. 100 kPa and a stated temperature (e.g. ΔH298Ɵ). Students should be able to define: standard enthalpy of combustion (ΔcH Ɵ); standard enthalpy of formation (ΔfH Ɵ). 7.1 7.2 7.3 7.4 2 Calorimetry ideas of finding the energy of burning fuels. Use calorimetry to investigate and evaluate the enthalpy of combustion of methanol. Describe how calorimetry can be used to measure the ΔcHƟ of methanol use q = mcΔT to calculate the molar enthalpy change for a reaction using data collected by calorimetry Evaluate calorimetric methods and make suggestions for improvement 3.1.4.2 Calorimetry The heat change, q, in a reaction is given by the equation q = mcΔT. Where m is the mass of the substance that has a temperature change ΔT and a specific heat capacity c. Students should be able to: use this equation to calculate the molar enthalpy change for a reaction; use this equation in related calculations. Students will not be expected to recall the value 7.5 Required practical 2: Measurement of an enthalpy change. 3 Enthalpy of solution out experiments to measure the enthalpy of solution of a range of different solids describe dissolution as an endothermic or exothermic process explain how to and carry out experiments to determine enthalpy change of solution use q = mcΔT to calculate the enthalpy change of solution 7.5 Required practical activity 2: Measurement of an enthalpy change. Student Book 7.5 page 152
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