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Collision theory is used to predict the rates of chemical reaction particularly for gases. It is based on the assumption that, for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another. Not all collisions, however, bring about chemical change. A collision will be effective in producing chemical change only if the species brought together possess a certain minimum value of internal energy, equal to the activation energy of the reaction. Furthermore, the colliding species must be oriented in a manner favourable to the necessary rearrangement of atoms and electrons. Thus, according to the collision theory, the rate at which a chemical reaction proceeds is equal to the frequency of effective collisions. Because atomic or molecular frequencies of collisions can be calculated with some degree of accuracy only for gases (by application of the kinetic theory, the application of the collision theory is limited to gas-phase only.
Postulates of collision theory are:
1) The rate of a reaction is proportional to the rate of reactant collisions in unit time.
The reacting species must collide in an orientation that allows contact between the atoms that will become bonded together in the product.
3) The collision must occur with adequate energy to permit mutual penetration of the reacting species’ valence shells so that the electrons can rearrange and form new bonds (and new chemical species).
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