IGCSE›Edexcel IGCSE Chemistry›Mind maps3.2 Rates of ReactionEdexcel IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsMeasuring rateGas volume produced over timeMass loss over time on a balanceTime for a cross to disappearChange one factor, keep others constantFactorsBigger surface area increases rateHigher concentration increases rateHigher pressure of a gas increases rateHigher temperature increases rateAdding a catalyst increases rateRatesrates of reactionEaCollision theoryParticles must collide with energy ≥ activation energySurface area, concentration: more frequent collisionsTemperature: faster particles, more successful collisionsCatalystsSpeeds up reaction, not used upGives a pathway with lower activation energyLowers the hump, ΔH unchangedExample: MnOX2\ce{MnO2}MnOX2 for decomposing hydrogen peroxideExam tipsSteeper gradient means faster rateFlat line means reaction has finishedTemperature: say greater proportion exceed activation energy