Chemical kinetics IIT JAM Notes | EduRev

IIT JAM : Chemical kinetics IIT JAM Notes | EduRev

 Page 1


 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
1 
 
 
 
 
                   Physical 
Chemistry 
TOPIC: CHEMICAL KINETICS 
Target CSIR-NET/GATE 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. 
Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: 
info@asfinstitute.com, www.asfinstitute.com  
Page 2


 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
1 
 
 
 
 
                   Physical 
Chemistry 
TOPIC: CHEMICAL KINETICS 
Target CSIR-NET/GATE 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. 
Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: 
info@asfinstitute.com, www.asfinstitute.com  
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
2 
 
SOME IMPORTANT GRAPH REPRESENTATION 
 
Use in chemical kinetics : 
(1)   y = mx + C 
 
 
(2) y = –mx + C 
 
(3) y = mx 
 
Page 3


 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
1 
 
 
 
 
                   Physical 
Chemistry 
TOPIC: CHEMICAL KINETICS 
Target CSIR-NET/GATE 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. 
Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: 
info@asfinstitute.com, www.asfinstitute.com  
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
2 
 
SOME IMPORTANT GRAPH REPRESENTATION 
 
Use in chemical kinetics : 
(1)   y = mx + C 
 
 
(2) y = –mx + C 
 
(3) y = mx 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
3 
 
(4) y = –mx 
 
 Slope = –m = tan ? 
 Intercept = zero 
(5) y = e
x
 
 
(6) y = e
–x
 
 
Page 4


 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
1 
 
 
 
 
                   Physical 
Chemistry 
TOPIC: CHEMICAL KINETICS 
Target CSIR-NET/GATE 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. 
Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: 
info@asfinstitute.com, www.asfinstitute.com  
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
2 
 
SOME IMPORTANT GRAPH REPRESENTATION 
 
Use in chemical kinetics : 
(1)   y = mx + C 
 
 
(2) y = –mx + C 
 
(3) y = mx 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
3 
 
(4) y = –mx 
 
 Slope = –m = tan ? 
 Intercept = zero 
(5) y = e
x
 
 
(6) y = e
–x
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
4 
 
(7) y = 
1
x
 
 
Page 5


 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
1 
 
 
 
 
                   Physical 
Chemistry 
TOPIC: CHEMICAL KINETICS 
Target CSIR-NET/GATE 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. 
Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: 
info@asfinstitute.com, www.asfinstitute.com  
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
2 
 
SOME IMPORTANT GRAPH REPRESENTATION 
 
Use in chemical kinetics : 
(1)   y = mx + C 
 
 
(2) y = –mx + C 
 
(3) y = mx 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
3 
 
(4) y = –mx 
 
 Slope = –m = tan ? 
 Intercept = zero 
(5) y = e
x
 
 
(6) y = e
–x
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
4 
 
(7) y = 
1
x
 
 
 
 
2637, Hudson Lane, Behind Khalsa College, Near G.T.B. Nagar Metro Station Gate No. 3 & 4, New Delhi – 110009 
Mob. 09555785548, 08860929430, e-mail: info@asfinstitute.com, www.asfinstitute.com  
 
5 
 
CHEMICAL KINETICS 
“Chemical kinetics involves the study of the rates and mechanism of chemical reactions.” 
The rates of reactions : 
(a)  The definition of rate : Consider a reaction of the form 
 A + 2B ? 3C + D …(1) 
in which the molar concentration of participants are [A], [B], [C] & [D]. 
The rate of consumption or decomposition of the one of the reactants at a given time is 
[ ] d R
dt
? , where R is A or B. The rate of formation of one of the products is 
[ ] d P
dt
, where P is C or D. 
The rate of reaction can be expressed with respect to any species in equation (1). 
 Rate = 
[ ] 1 [ ] 1 [ ] [ ]
2 3
d A d B d C d D
dt dt dt dt
? ? ? ? 
Thus, the rate of reaction can be defined with respect to both reactants and products. 
For example : 
4NO
2
(g) + O
2
(g)  ?  2N
2
O
2
(g) 
find the expression for rate of reaction. 
Sol.  4NO
2
(g) + O
2
(g)  ?  2N
2
O
2
(g) 
 rate = 
2 5 2 2
[ ] 1 [ ] [ ] 1
4 2
d N O d NO d O
dt dt dt
? ? ? 
(b)  Rate laws and rate constant : 
The rate of a reaction will generally depends on temperature pressure and concentration of 
species involving in the reaction. 
The rate of reaction is proportional to the molar concentration of reacting species. 
i.e.  A + B + C + D + ……. ? Product 
then, rate of reaction = k[A]
a
 [B]
b
 [C]
c
 [D]
d
 ……….. 
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