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
t1/2 = 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.
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
The number of molecules that participate in an elementary reaction
single molecule in molecularity
two molecules in molecularity
three molecules in molecularity
Rate determining step
Step with the largest/steepest Ea
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....
k and t1/2 are _______
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
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