Chemical kinetics is the branch of chemistry which deals with the study of:
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The rate of reaction is defined as “ The quality of reactants consumed or quantity of products produced per unit time”.
Where,
dx = small change in the concentration of reactants or products.
dt = small change in the time.
Consider the following hypothetical reaction:
According to the law of mass action,
Rate of Reaction = K [A] [B]
This is the rate expression and where ‘K’ is the rate constant.
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When the concentration of each reactant is unity, that is, 1mol / dm3 , so the rate constant is known as ‘Specific Rate Constant’.
As we know that:
So, the rate of a reaction when the molar concentration of each reactant is unity is known as the specific rate constant.
An experimentally determined mathematical expression which relates the molar concentration of reactants to the reaction rate is known as rate equation or rate law.
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Types of Reaction Based on Reaction Velocity
On the basis of their rates or velocity, there are three types of reactions which are as follows:
These are the reactions, which proceed with the extremely slow speed and take longer time for their completion. It is difficult to determine experimentally the rates of such chemical reactions.
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These are the reactions, which proceed with the high speed and take very short time for their completion. It is impossible to determine experimentally the rates of such chemical reactions.
These are the reactions, which proceed at experimentally measurable rates, i.e. with a limited (moderate) speed and completed at the most, in few hours.
“It is the sum of all the exponents of the concentration of reactants involved in the rate equation”.
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