IGCSE›Edexcel IGCSE Chemistry›Mind maps3.1 EnergeticsEdexcel IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsExo and endoExothermic gives out heat, surroundings warm upEndothermic takes in heat, surroundings cool downExothermic: combustion and neutralisationEndothermic: thermal decompositionCalorimetryMeasure temperature change in insulated containerStir and record the highest or lowest temperatureQ=mcΔTQ = mc\Delta TQ=mcΔTc for water is 4.2 J/g°C4.2\,\text{J/g°C}4.2J/g°CEnergeticsenergy changesQΔHkJEnthalpy changeΔH=Qmoles\Delta H = \frac{Q}{\text{moles}}ΔH=molesQConvert J to kJ/mol by dividing by 1000Negative for exothermicPositive for endothermicEnergy diagramsExothermic: products lower than reactantsEndothermic: products higher than reactantsBond breaking is endothermicBond making is exothermicΔH=\Delta H = ΔH= broken − madeExam tipsConvert solution volume to mass, 1 cm³ ≈ 1 gState bond breaking endothermic, making exothermic