(A) Threshold Energy and Activation
Energy:
Threshold energy(THE): For a reaction to take place the reacting molecules must
colloid together, but only those collisions, in which colliding molecules
possess certain minimum energy is called threshold energy (THE or ET) or the
total minimum energy that reacting species must possess in order to undergo
effective collision to form product molecules is called threshold energy.
Activation energy (Ea): It is extra energy which must be possessed by reactant molecules
so that collision between reactant molecules is effective and leads to
formation of product molecules.
ET =Threshold Energy, (THE)
HR = Enthalpy or Energy or Potential of
reactants.
HP = Enthalpy or Energy or Potential of
product,
(Ea)f =Activation energy for forward reaction.
(Ea)b =Activation energy for backward
reaction.
Activated complex: It
is formed between reacting molecules which is highly unstable and readily changes
into product.
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