12 chemistry notes ch04 chemical kinetics

12 chemistry notes ch04 chemical kinetics

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(CBSE Class-12 Chemistry Quick Revision Notes
Chapter-04: Chemical Kinetics

Chemical kinetics:
It is the branch of chemistry that deals with the study of reaction rates and their
nechanisms.

Rate of reaction:

Its the change in concentration of reactant (or product) in uni time.

‘The unit of rate of reaction is mol L's,

A+B=C=D

“dial

Rate of disappearance of A ==

‘where dfA] is small change in conc. ofA’ and dt is small interval of time

Rate of disappearance of „= 4121

‘Where d[B] is small change in conc of B' and dt is small interval oftime

‘Where d[D] is small change in cone. of D' and dt is small interval of

lA), 418) _ +d1C]_ +411

Rate
a a a

Rate law or rate equation:
tis the expression which relates the rate of reaction with concentration of the reactants
‘The constant of proportionality "is known as rate constant.

Average rate:

Its the rate of reaction measured over a long time interval.

ax
Average rate = À
ere yy

here is Ax change in concentration and Ati large interval of
Instantaneous rate
Its the rate of reaction when the average rate is taken over a particular moment of time.

Instantaneous rate

and dt is he smallest interval of time,

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