What you’ll learn4 learning objectivesChoose one objective for a focused lesson, or study the complete topic.1.1.1Energy transfer• Chemical reactions transfer energy between system and surroundings• Total energy conserved• Heat vs. temperatureSyllabus objective1.1.2Endothermic vs. exothermic• Endothermic: energy absorbed (T decreases)• Exothermic: energy released (T increases)Syllabus objective1.1.3Stability and energy• Relative stability determines endo/exothermic nature• Energy profiles• Sketch and interpret labelled energy profiles for endothermic and exothermic reactionsSyllabus objective1.1.4Standard enthalpy change (ΔH⦵)• Heat transferred at constant pressure, standard conditions• Q = mcΔT• ΔH = −Q/n• Calculate enthalpy change from calorimetry dataSyllabus objective