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Collision Theory
Reactions only occur when collisions take place between particles having sufficient energy. This is
called activation energy.

Activation energy ­ min. amount of KE required for particles to react.
Most collisions do not lead to a reaction because most particles don't have enough activation

MaxwellBoltzmann Distribution…

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Effect of Pressure
If reaction involves gases then inc. pressure of gases works the same way. Raising pressure pushes
all gas particles closer so increases No. in given vol. This increased frequency of collisions which
increases rate.

A substance that inc. rate of chemical reaction without being changed in…


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