# Chem II Test 3

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1. Formula for average reaction rate
-[A]/aΔt = -[B]/bΔt = [C]/cΔt = [D]/dΔt
2. Rate law for a reaction
Rate = k[A]x[B]y
3. 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.
4. Formula for the concentration of A at time t
ln[A]t = -kt + ln[A]o
5. Half life equation
t1/2 = 0.693 / k
6. Reaction rate _____ with increasing temperature or ___ proportional to ____
Increases; k to T
7. The reaction rate ______ with the increasing of Ea. Or k is ______ proportional to Ea.
Decreases; inversely
8. 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
9. Molecularity
The number of molecules that participate in an elementary reaction
10. single molecule in molecularity
unimolecular
11. two molecules in molecularity
bimolecular
12. three molecules in molecularity
termamolecular
13. Rate determining step
Step with the largest/steepest Ea
14. Intermediates
The arches in a reaction profile
15. What is an endothermic reaction?
When the products are greater than the reactants
16. What is an exothermic reaction?
When the reactants are greater than the products
17. Ea, activation energy is always....
Positive!
18. k and t1/2 are _______
Inversely proportional
19. Zero order integrated rate law and graph
[A[ = -kt + [A]o

Graph: [A] vs. t
20. 1st order integrated rate law and graph
ln[A] = -kt + ln [A]o

Graph: ln[A] vs t
21. 2nd order integrated rate law and graph
1/[A] = kt + 1/[A]o

Graph 1/[A] vs. t

### Card Set Information

 Author: smittykitty ID: 298030 Filename: Chem II Test 3 Updated: 2015-03-10 05:34:41 Tags: chemistry Folders: Description: Chem II Test 3 Show Answers:

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