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In some cases, it is found that a large ...

In some cases, it is found that a large number of colliding molecules have energy more than thereshold value, yet the reaction is slow. Why?

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In addition to activation energy, another important factor which influences the reactions rate is the orientation factor. This means that if the colliding molecues are not properly oriented at the time of collisons, still most of the collisions will be wasted without yeilding any product though the reactants may have energy more than the activation energy. Such reactions will be quite slow.
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