AQA AS LEVEL ENERGETICS LEARNING OUTCOMES

Topic 4 – Energetics (both Papers)

for skills development

·         I can describe reactions can be endothermic or exothermic

·         I can define enthalpy change (ΔH) as the heat energy change measured under conditions of constant pressure

·         I can describe standard enthalpy changes as referring to standard conditions ie 100 kPa and a stated temperature (eg ΔH298 Ɵ)

·         I can define standard enthalpy of combustion (ΔcHƟ) and standard enthalpy of formation (ΔfHƟ

·         I can describe the heat change, q, in a reaction as 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

·         I can use this equation to calculate the molar enthalpy change for a reaction

·         I can use this equation in related calculations

·         I can define Hess’ Law and use it to perform calculations, including calculation of enthalpy changes for reactions from enthalpies of combustion or from enthalpies of formation

·         I can define the term mean bond enthalpy

·         I can use mean bond enthalpies to calculate an approximate value of ΔH for reactions in the gaseous phase

·         I can explain why values from mean bond enthalpy calculations differ from those determined using Hess’s law

·         I can carry out an experiment to measure an enthalpy change (Required Practical 2)