combustion and use Hess’s Law to perform calculations, Students should be able to use AT a and k reaction. Use Hess’s law including calculation of enthalpy Hess’s Law to perform PS 2.4, 3.2 and 4.1: to calculate values of changes for reactions from enthalpies calculations, including Students could be asked any one of these of combustion or from enthalpies of calculation of enthalpy changes to find for a reaction enthalpies formation ΔH for reactions from enthalpies of using Hess’s law and combustion or from enthalpies calorimetry, then 7 Hydration of a metal 7.6 of formation. present data in salt collect experimental data to calculate appropriate ways. Determine the enthalpy enthalpy changes Examples of reactions of solution for use Hess’s law to calculate enthalpy could include: thermal anhydrous and hydrated changes for reactions that cannot be decomposition of magnesium sulfate determined directly NaHCO3; hydration of experimentally and use Explain how Hess’s law can be used to MgSO4; hydration of these values and Hess’s calculate enthalpy changes for CuSO4 Law to calculate the reactions enthalpy of reaction to form the hydrated salt. 8 A Thermal 7.6 decomposition reaction collect experimental data to calculate Work out how to enthalpy changes measure the enthalpy work out how Hess’s law to calculate change for the thermal enthalpy changes for the decomposition of decomposition of sodium hydrogen sodium hydrogen carbonate carbonate using explain and plan an investigation to use enthalpy of Hess’s law to calculate enthalpy neutralisation. Plan and changes for this reaction carry out the investigation. 9 Bond enthalpies 3.1.4.4 Bond enthalpies MS 1.2: Students 7.7 understand that bond Mean bond enthalpy. Recap energy level define the term mean bond enthalpy enthalpies are mean diagrams and ideas of values across a range of bond making and bond
combustion and reaction. Use Hess’s law to calculate values of any one of these enthalpies use Hess’s Law to perform calculations, including calculation of enthalpy changes for reactions from enthalpies of combustion or from enthalpies of formation Students should be able to use Hess’s Law to perform calculations, including calculation of enthalpy changes for reactions from enthalpies of combustion or from enthalpies of formation. AT a and k PS 2.4, 3.2 and 4.1: Students could be asked to find ΔH for a reaction using Hess’s law and calorimetry, then present data in appropriate ways. Examples of reactions could include: thermal decomposition of NaHCO3; hydration of MgSO4; hydration of CuSO4 7 Hydration of a metal salt Determine the enthalpy of solution for anhydrous and hydrated magnesium sulfate experimentally and use these values and Hess’s Law to calculate the enthalpy of reaction to form the hydrated salt. collect experimental data to calculate enthalpy changes use Hess’s law to calculate enthalpy changes for reactions that cannot be determined directly Explain how Hess’s law can be used to calculate enthalpy changes for reactions 7.6 8 A Thermal decomposition reaction Work out how to measure the enthalpy change for the thermal decomposition of sodium hydrogen carbonate using enthalpy of neutralisation. Plan and carry out the investigation. collect experimental data to calculate enthalpy changes work out how Hess’s law to calculate enthalpy changes for the decomposition of sodium hydrogen carbonate explain and plan an investigation to use Hess’s law to calculate enthalpy changes for this reaction 7.6 9 Bond enthalpies Recap energy level diagrams and ideas of bond making and bond define the term mean bond enthalpy 3.1.4.4 Bond enthalpies Mean bond enthalpy. MS 1.2: Students understand that bond enthalpies are mean values across a range of 7.7
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