Chemical kinetics - Rate and Rate constant - Problem to solve with solution

1. CHEMICAL
KINETICS

2. *Chemical kinetics is the study of the
rate and the mechanism of chemical
reactions, proceeding under given
conditions of temperature, pressure,
concentration etc.
*The study of chemical kinetics not only
help us to determine the rate of a
chemical reaction, but also useful in
optimizing the process conditions of
industrial manufacturing processes,
organic and inorganic synthesis etc.

3. Rate
In a chemical reaction, the change in
the concentration of the species
involved in a chemical reaction per unit
time gives the rate of a reaction.

4. Consider a reaction AB

6. Stoichiometry and rate of reaction

7. Average rate and instantaneous rate.
Average rate is defined as the rate of
reaction at a particular interval of time.
Instantaneous rate is the rate of a
reaction at that instant i.e, infinitesimally
small time period.

8. Rate law and Rate constant.
Rate law which relate rate of a reaction
with rate constant and concentration of
reactant.
Ex. A+B --> c ; For this reaction rate law is
written as r = k [A] [B]
Rate constant is equal to rate of the
reaction when concentration of all the
reactants kept unity.

9. order
It is defined as sum of the power of
concentration term that involved in rate
equation.
The rate law for the reaction
aA + bB----> Product
Rate = K [ A ]a [ B ]b
Order = a + b

14. Molecularity is the total number of
reactants present in the elementary step.
Rate determining step with examples
Slowest step is the rate determining step in the
series of chemical reaction which occurs
simultaneously.
Consider a reaction A--------> C
The product formed in two steps.
A--->B (slow) -------step:1
B-->C (fast) -------- step:2
Among these step 1 is slow step and it is rate
determining step.