Chemical kinetic
INDRODUCTION:
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Notes given below :-
Revision Notes on Chemical Kinetics:
Rate of Reaction:
Rate of change of extent of reaction is the rate of reaction.
Rate of reaction is positive for product and negative for reactant.
For reaction aA →bB
Rate =1/b(Δ[B]/ Δ t) = -1/a (Δ [A]/ Δt)It goes on decreasing as the reaction progress due to decrease in the concentration(s) of the reactant(s).
Elementary Reaction:
It is the reaction which completes in a single step.
A reaction may involve more than one elementary reactions or steps also.
Overall rate of reaction depends on the slowest elementary step and thus it is known as rate determining step.
Molecularity of Reaction:
Number of molecules taking part in an elementary step is known as its molecularity.
Order of an elementary reaction is always equal to its molecularity.
Elementary reactions with molecularity greater than three are not known because collisions in which more than three particles come together simultaneously are rare.
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