CHEMICAL KINETICS
Introduction
Definition of chemical Kinetics
Chemical
kinetics is a branch of physical chemistry that deals with
i)
Rate of chemical reaction
ii)
Factors that affect rate of chemical reaction
iii)
Mechanism
of chemical reaction
What is rate of reaction?
The
rate of reaction, or speed of reaction, is the “change in concentration of any
reacting species with respect to time.
R →P
Change
in concentration of reactants with respect to time
Change
in concentration of products with respect to time
Remember that the rate in terms of reactants is
negative, which only indicates that the concentration of reactants is
decreasing with time. Similarly, the rate in terms of products is positive,
which indicates that the concentration of products is increasing with time.
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What is an average rate of reaction?
Average rate of
reaction is the change in concentration over a specified interval of time.
Instantaneous rate of
reaction is the change in concentration at a given moment.
Here 
is
the rate of consumption of reactants and
is the rate of formation of products.
When co-efficient of reactants and products are same, then rate of consumption of reactant and formation of products is same.
Unit
of rate of reaction
Or Ms-1 (molL-1= Molarity)
What is
rate law or rate expression?
It is a
mathematical expression that related the rate of reaction to the concentration
of reactant and product.
OR
Mathematical
expression that relates the concentration of reactant or product to time.
Rate
expression can be
- Differential
- Integral
 |
Figure: 1.1 rate of reaction
Here slope
of the graph is rate.
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