Enrichment – Rate Equations to Determine Reaction Order
Equation for a straight line: y = mx + b
rearranged rate law for first order: ln [A] = a k t + ln[A]
0
Do the three plots: which one is linear?
versus time: zero order
ln versus time: first order
inverse versus time: second order
Example 169
Pg. 254 of lecture online
Slope = 0.20 = k
Thus the rate constant k = 0.20 min
1
rearranged rate law for second order: 1/[A] = a k t + 1/[A]
0
Example 1610
Slope = 0.90 = 2k
Thus the rate constant k = 0.45 M
1
min
1
Collision Theory of Reaction Rates
three basic events must occur for a reaction ot occur. The atoms, molecules or ions must:
1. collide
2. Collide with enough energy to break and form bonds.
3. Collide with the proper orientation for a reaction to occur
one method to increase the number of collisions and the energy necessary to break and reform
bonds is to
heat the molecules
effective collision
Transition State Theory
the relationship between the activation energy for forward and reverse reactions
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 Spring '08
 Suggs
 Reaction, 2k, 1min, 20°C, 30°C

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