CHM LECTURE NOTES 13 5 Arrhenius equation k Ae Ea RT k rate constant A frequency factor Ea activation energy Ea energy barrier that should be overcome for a reaction to take place The higher the activation energy the slower the reaction rate As the temperature increases more molecules will have enough energy to form more collisions higher temp lower Ea Ea decreases with temperature increase Reaction becomes faster Arrhenius plot lnk Ea R 1 T lnA In case of 2 points of data ln k2 k1 Ea R 1 T2 1 T1 The collision model A chemical reaction occurs after a sufficiently energetic collision between 2 reactant molecules a collision happens after enough molecules collide react the frequency factor A is an approximation of the number of collisions in a reaction
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