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Chemical Kinetics Formulae Cheat Sheet, Cheat Sheet of Chemical Kinetics

Useful formulae for Chemical Kinetics exam

Typology: Cheat Sheet

2019/2020

Uploaded on 11/27/2020

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1. Instantaneous rate =
dx
dt
, where dx is small change in conc. and dt
is the smallest interval of time.
2. Average rate =
x
t
, where
x
is change in concentration and
t
is
large interval of time.
3.
A + B
C + D
Rate of disappearance of
=
A
dt
, where d[A] is small change in
conc. of ‘A’ and dt is small interval of time
Rate of disappearance of B
d[B]
dt
=,
Rate of appearance of C
d[C]
dt
+
=
Rate of appearance of D
d[D]
dt
+
=
Rate
d[A] d[B] d[C] d[D]
dt dt dt dt
= = = =
Unit of rate of reaction = mol L
-1
s-
1
4. Order of reaction:
x y
Remember: Order cannot be determined with a given balanced
chemical equation. It can be experimentally determined.
XII
Chemistry
CHAPTER 4 - CHEMICAL KINETICS
If rate law expression for a reaction is
Rate = k [A] [B]
Order of reaction = x + y
u
Important Terms, Definitions & Formulae
Formulae For CHEMICAL KINETICS
FORMULAS- C
HEMICAL KINETICS CHEAT SHEET
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  1. Instantaneous rate = dx dt , where dx is small change in conc. and dt is the smallest interval of time.
  2. Average rate = ∆ ∆xt , where ∆x is change in concentration and ∆t is large interval of time.
  3. A + B → C + D Rate of disappearance of A = −d[A]dt , where d[A] is small change in conc. of ‘A’ and dt is small interval of time Rate of disappearance of B = −d[B]dt ,

Rate of appearance of C =^ +d[C]dt

Rate of appearance of D =^ +d[D]dt

Rate =^ −d[A]^ dt =^ −d[B]dt =^ d[C]dt =d[D]dt

Unit of rate of reaction = mol L-1s-^1

  1. Order of reaction:

x y

Remember: Order cannot be determined with a given balanced chemical equation. It can be experimentally determined.

XII Chemistry

CHAPTER 4 - CHEMICAL KINETICS

If rate law expression for a reaction is Rate = k [A] [B] Order of reaction = x + y

u

Important Terms, Definitions & Formulae

Formulae For CHEMICAL KINETICS

FORMULAS- CHEMICAL KINETICS CHEAT SHEET

  1. Integrated rate law for zero order reaction: R → P dx (^) k[R] 0 dt = Unit of ‘k’ is mol L-1s-

k [R ]^ o^ [R]

t

=^ -

If we plot a graph between concentration of R vs time, the graph is a straight line with slope equal to -k and intercept is equal to [Ro]

  1. Half- life reaction for a for zero order reaction: t½ =[R ] 2k^0
  2. Rate law for 1st^ order reaction: R → P k 2.303log[R ]^ o = t [R]

where ‘k’ is rate constant, [Ro] is initial molar conc., [R] is final molar conc. after time ‘t’

  1. Half- Life for a first order reaction is: ½ t 0. = k

of the type

A(g) → B(g) + C(g)

i i t

k = 2.303^ log p t (2p -p ) Where: pi is initial pressure of A pt is total pressure of gaseous mixture containing A , B, C Remember: pt = pA + pB + pC

k = A e-E /RT^ a

  1. Formula to calculate rate constant for first order gas phase reaction
  2. Arrhenius equation: