IGCSE›Cambridge IGCSE Chemistry›Mind mapsRate of ReactionCambridge IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsFive factorsConcentration raises the ratePressure of gases raises the rateSurface area of solids raises the rateTemperature has the largest effectCatalysts raise the rate tooCollision theoryReaction needs a collision with energy ≥Ea\geq E_a≥EaFaster if collisions are more frequentOr if more collisions have enough energyWhy each worksConcentration and pressure: more particles per unit volumeTemperature: more collisions have energy ≥Ea\geq E_a≥EaSurface area: more of the solid exposedPowder reacts faster than chunksRateof reactionCatalystsProvide an alternative pathwayLower the activation energyUnchanged and not consumedEnzymes are biological catalystsMeasuring rateChange in mass as gas escapesGas volume with a gas syringePlot against time: gradient is the rateSteeper means fasterExam tipsExplain every factor using collision theorySurface area is about exposure, not faster particlesEvaluate methods: one strength and one weaknessGas syringes can stick