Author KimberlieSydnes107 in Chemistry, 08.19.2019

What is collision theory? How does it relate to factors that affect reaction rate?

Answered by ibby

Collision theory is a theory proposedindependently by [1] Max Trautz in 1916 andWilliam Lewis in 1918, that qualitatively explainshow chemical reactions occur and why reactionrates differ for different reactions. [2] Thecollision theory states that when suitableparticles of the reactant hit each other, only acertain percentage of the collisions cause anynoticeable or significant chemical change; thesesuccessful changes are called successfulcollisions. The successful collisions have enoughenergy, also known as activation energy , at themoment of impact to break the preexistingbonds and form all new bonds. This results in theproducts of the reaction. Increasing theconcentration of the reactant particles orraising the temperature, thus bringing aboutmore collisions and therefore many moresuccessful collisions, increases the rate ofreaction.When a catalyst is involved in the collisionbetween the reactant molecules, less energy isrequired for the chemical change to take place,and hence more collisions have sufficient energyfor reaction to occur. The reaction ratetherefore increases.Collision theory is closely related to chemicalkinetics .

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