It is a mathematical expression which relates rate of reaction with concentration It can be derived only by performing experiments.
R = k [A] 2
k is called rate constant or specific rate constant
Unit of k varies from reaction to reaction depending on the order of the reaction.
Unit of rate of reaction is mol L–1 s–1
Rate = k [A]x [B]y
Generally units of K is determined by
Units of k are very significant to identify the order of reaction.
The value of k for a particular reaction changes by change in temperature.
For a particular temperature value, k is different for different reactions.
It is a theoretical aspect and it is defined as the sum of the number of molecules undergoing the covalency change in a balanced stoichiometric equation of a reaction
Molecularity of a reaction cannot be zero, negative or infractions.
Molecularity can be determined just by the equation [chemical].
The slowest steps of the reaction determine the molecularity and rate of the reaction. It cannot be greater than 3.
Molecularity of a reaction is an invariable fact for a particular reaction. But order can be variated.
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