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*KT: temp in KelvinEa: activation energyA: 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]_{o
}Graph: [A] vs. t

1st order integrated rate law and graph
ln[A] = kt + ln [A]_{o
}Graph: ln[A] vs t

2nd order integrated rate law and graph
1/[A] = kt + 1/[A]_{o
}Graph 1/[A] vs. t