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1
QURATULAIN MUGHALBATCH IV
DOCTOR OF PHYSICAL THERAPYISRA UNIVERSITY
2
CHEMICAL KINEMATICS
DEFINITION:
“the branch of physical chemistry which deals with the rate of chemical reactions and the mechanism through which they occur is called chemical kinematics”
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RATE OF REACTION
• DEFINITION:
“the decrease in concentration of reactant or increase in concentration of the products of the reaction at a given moment of time is called rate of reaction”
FORMULA:
dx/dt=K
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CONTI…..
• Where,
dx=change in concentration
dt=time taken for change
K= reaction rate constant
5
ORDER OF REACTION
• DEFINITION:“the number of reacting molecules whose
concentration alters as a result of chemical change is called the order of reaction”
OR“the sum of exponents in the rate expression of a
reaction is the order of reaction” OR“the power to which concentration of reactant is to
be raised to get the rate of reaction”
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CONTIN……
• EXAMPLES:
mA+rB product
rate = K[A] ͫ [B] ͫ
The oder of reaction= (m+r)
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TYPES OF ORDER REACTION
1. First order reaction
2.Second order reaction
3.zero order reaction
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FIRST ORDER REACTION
• If a reaction rate depends on a single reactant and the value of the exponent is one, then the reaction is said to be first order.
• r = k [A]
• FORMULA:
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FIRST ORDER REACTION
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SECOND-ORDER REACTION
• the rate of reaction is directly proportional to the square of the concentration of one of the reactants.
• r = k [A]2
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ZERO-ORDER REACTION
• For a zero-order reaction, the rate of reaction is a constant. When the limiting reactant is completely consumed, the reaction abrupt stops.
• r = k
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