Kinetics Factors affecting reactions rates, collision theory, relative rates, differential rate law, concentration and rate. Notes- AP Chem. What is Chemical Kinetics?. Chemical kinetics-the study of the speed or rate of a reaction under various conditions.
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KineticsFactors affecting reactions rates, collision theory, relative rates, differential rate law, concentration and rate
Notes- AP Chem
Pointers:
Chemical identity
5.Surface area of reactants--exposed surfaces affect speed.
time interval
t 50.0 s
Rate of reaction = - 1[NO2] = 1 [NO] = [ O2]
4 PH3 (g) P4(g) + 6 H2(g)
C
aA + bB xX
Where C is a catalyst, the rate expression will always have the form
Initial Rxn Rate=k [A]m [B]n [C]p
Initial Rxn Rate=k [A]m [B]n [C]p
The Rate constant, k
reaction orders: m, n, and p
A + B C + D
Rate = k [A ]2 [B]
THINK of the concentration doubling as the number two. So, rate = k[reactant] becomes, rate = k[2]m and you are trying to determine the value of m. If the rate doubled think (2 rate) = k[2]m and more simply 2 = [2]m, so m = 1. If the rate quadrupled, then think simply, 4 = [2]m and m must equal 2 to make that a true statement, and so on
4. Finally, examine the data table again. This time look for trials where the concentration of the reactant you just determined the order for is held constant and repeat steps 1-3 above.
This may be useful:
(factor concentration increased by)n =
(factor rate will increase by)
BrO3- + 5Br- + 6H+ 3Br2 + 3H2O
Determine the rate law for this reaction (in other words, figure out the orders of your reactants)