CHEMICAL
KINETICS
TEMPERATURE RELATIONSHIP
ARRHENIUS EQUATION
GCHEM
II
CONCEPT
ANSWERS
Temperature Reaction Rate Dependency
states that a reaction rate is faster at higher temperature
because the reaction rate constant (k) is larger.
Reaction rate constant is fixed for a given temperature.
Reaction rate constant ln (k) plotted versus 1/temperature (1/K
) for a given reaction
will result is a
exponential shaped curve
represented by the following equation:
Arrhenius Equation:
k
=
A
e
—Ea/RT
ln(k)
=
lnA
– Ea/R
*
1/T
y
=
b
slope
*
x
where
A
=
frequency factor
[ln(A) = equal b (y intercept)]
Ea
=
activation energy (J/mole)
T
=
temperature (K)
R
=
gas law constant 8.314 J/mole  K
Activation Energy:
Ea =
– (slope) * R
Two Point Activation Energy: ln (k
2
/k
1
) = + Ea/R (1/T
1
– 1/T
2
)
where k
2
and T
2
are higher values
1)
The following equation was obtained from a plot of
ln k versus 1/T for the reaction of NO(g) + O
3
(g)
NO
2
(g) + O(g)
y =
– 2345x
+
23.54.
What is the activation energy ?
frequency factor ?
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Summer '08
 Staff
 Chemistry, Kinetics, energy use, ea, 1/T

Click to edit the document details