IGCSE›Oxford AQA IGCSE Chemistry›Mind mapsExothermic & Endothermic ReactionsOxford AQA IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsEnergy transferReactions transfer energy to or from surroundingsSurroundings hotter: energy given outSurroundings colder: energy taken inExothermicEnergy to the surroundingsTemperature increasesCombustion, oxidation, neutralisationΔH\Delta HΔH is negativeEnergy changesexo and endothermicΔHEndothermicEnergy from the surroundingsTemperature decreasesThermal decomposition, e.g. metal carbonatesΔH\Delta HΔH is positiveMeaning of ΔHOverall energy change of the reactionNegative: products have less energyPositive: products have more energyExam tipsLink the sign of ΔH to energy directionNeeding a spark does not mean endothermicClassify by surroundings' temperature change