IGCSE›Oxford AQA IGCSE Chemistry›Mind mapsCollision Theory & Activation EnergyOxford AQA IGCSE Chemistry: Mind mapStudy pack PDFAlso for this subtopic:Revision notesFlashcardsSubtopic testCover factsThe theoryParticles must collide to reactAnd collide with enough energyExplains why some reactions are fasterCollisionsMost collisions are unsuccessfulOnly sufficient energy collisions reactThese are successful collisionsParticles without enough energy bounce backCollision theoryand activation energyEaE_aEaActivation energyMinimum energy needed to react on collisionBelow it, no reaction however often they collideLike a hill reactants must climbRaising the rateMore frequent collisions raise the rateMore collisions with enough energy raise the rateGives more successful collisions per secondExam tipsNever just say particles collideAlways add sufficient energy to react