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Give a detailed account of the Collision...

Give a detailed account of the Collision theory of reaction rates of biomolecular reaction.

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According to collision theory, the reactant molecules are assumed to be hard spheres and reaction occur only when molecules collide each other. The number of collisions per second per unit volume of the reaction mixture is known as collision frequency(Z). Activation, energy also effects the rate chemical deactions.
`A+B to` Products
Rate of rection is
Rate `=Z_(AB)e^(-E_(ar)//RT)`
Where `Z_(AB)` represents the collision frequency of reactants. A and B and `e^(-E_(a)//RT)` represents the fraction of molecules with energies equal to or greater than `E_(a)`
All collisions do not lead to the formation of products. The collisions in which the molecules having threshold energy and proper orientation leads to the formation of products. Such collisions are called effective collisions.
If the colliding molecules have improper orientation they bounce back and no reaction takes place.
To account for effective collisions a new factor .p. called probability or steric factor is introduced.
Rate `PZ_(AB)e^(-E_(a)//RT)`
Thus, in collision theory activation energy and propt., orientation of the molecules together determine the criteria for an effective collision and hence the rate of a chemical reaction.
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Knowledge Check

  • The rate of a chemical reaction

    A
    increases as the reaction proceeds
    B
    decreases as the reaction proceeds
    C
    may increase or decrease during the reaction
    D
    remains constant as the reaction proceeds
  • According to collision theory of reaction rates, the activation energy is

    A
    the energy gained by the molecule on colliding with other molecules
    B
    the energy that molecule should possess in order to undergo reaction
    C
    the energy it should possess so that it can enter into an effective collision
    D
    the energy ithas to acquire so that it can enter into an effective collision
  • According to collision theory of reaction rate, the activation energy is

    A
    the energy gained by the molecule on colliding with other molecules.
    B
    the energy that molecule should possess in order to undergo reaction
    C
    the energy it should possess so that it can enter into an effective collision
    D
    the energy it has to acquire so that it can enter into an effective collision.
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    Collision theory satisfactorily explains

    Collision theory satisfactorily explains