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Chem II Test 3
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Formula for average reaction rate
-[A]/aΔt = -[B]/bΔt = [C]/cΔt = [D]/dΔt
Rate law for a reaction
Rate = k[A]
x
[B]
y
How do you know the overall rate of a reaction?
You add the order of each reactant.
So two first orders make a second order reaction. And a first order and second order make a third order reaction.
Formula for the concentration of A at time
t
ln[A]
t
= -kt + ln[A]
o
Half life equation
t
1/2
= 0.693 / k
Reaction rate _____ with increasing temperature or ___ proportional to ____
Increases; k to T
The reaction rate ______ with the increasing of Ea. Or k is ______ proportional to Ea.
Decreases; inversely
Arrhenius equation
k = Ae
-Ea/RT
R gas constant: 8.3145 J/mol*K
T
: temp in Kelvin
Ea
: activation energy
A
: Arrenius constant or frequency factor
Molecularity
The number of molecules that participate in an elementary reaction
single molecule in molecularity
unimolecular
two molecules in molecularity
bimolecular
three molecules in molecularity
termamolecular
Rate determining step
Step with the largest/steepest Ea
Intermediates
The arches in a reaction profile
What is an endothermic reaction?
When the products are greater than the reactants
What is an exothermic reaction?
When the reactants are greater than the products
Ea, activation energy is always....
Positive!
k and
t
1/2
are _______
Inversely proportional
Zero order integrated rate law and graph
[A[ = -k
t
+ [A]
o
Graph: [A] vs.
t
1st order integrated rate law and graph
ln[A] = -k
t
+ ln [A]
o
Graph: ln[A] vs
t
2nd order integrated rate law and graph
1/[A] = k
t
+ 1/[A]
o
Graph 1/[A] vs.
t
Author
smittykitty
ID
298030
Card Set
Chem II Test 3
Description
Chem II Test 3
Updated
2015-03-10T05:34:41Z
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