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[ = -kt + [A]_oGraph: [A] vs. t
1st order integrated rate law and graph

ln[A] = -kt + ln [A]_oGraph: ln[A] vs t
2nd order integrated rate law and graph

1/[A] = kt + 1/[A]_oGraph 1/[A] vs. t

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Card Set

Chem II Test 3

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Chem II Test 3

Updated

2015-03-10T05:34:41Z

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