Kinetics

Kinetics

1. Rate=k x [A]^m x [B]^n

   • Rate = mol dm^-3 s^-1
     • The rate of the reaction is defined as the change in conc. with unit time
   • k = rate constant
     • The constant of proportionality in the rate expression
     • The units depend on the orders of the reactants
   • [A] / [B] = concentration of reactants
     • mol dm^-3
   • m / n = orders of reaction with respect to the reactants (0, 1 or 2)

2. 0th order

   • The rate is not affected by the concentration of a species

3. 1st order

   • The rate is directly proportional to the concentration of a species

4. 2nd order

   • The rate is proportional to the square of the concentration of a species

5. Increasing temperature always increases the rate of reaction and the value of k

6. Rate determining step

   • The slowest step in the reaction mechanism. It governs the rate of the overall reaction
   • The species in the rate equation are the reactants involved in reactions occuring before the rate determining step
   • If a reactant doesn't appear in the rate equation, it won't be involved in the rate-determining step

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