For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?


The two most important conditions for a reaction to occur according to the collision theory are:


• Energy greater than activation energy.


• Proper orientation of reactant molecules at the time of collision.


The equation of the collision theory is given by


Rate = PzABe-Ea/RT


So when the reaction occurs then molecules that don’t have a proper orientation decreases the rate of a reaction.




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