Collision Theory

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Collision Theory
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Reaction Coordinate Diagrams
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Multistep Reactions
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Rates, Temperature and Ea
Boltzmann Plots and k Temperature Activat
ion Energy
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Arrhenius Equation Temperature and Ea Dependence
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What about A?
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Example 1. Use the data below to find Ea.
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Example 2. A reaction has Ea 75 kJ/mol. If k
1.50 x 10-3 at 25 oC, what is k at 50 oC?
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Example 3. A reaction doubles its rate when the
temperature increases
from 25 oC to 35 oC. What is the activation
energy?
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Reaction Mechanisms The pathway by which a
reaction proceeds from reactants to products.

• Each discrete chemical event is an elementary
  step.
• The reaction is a series of elementary steps.
• Steps are usually unimolecular or bimolecular.
• The overall reaction is the sum of the steps.
• Each elementary step goes at its own rate.
• The rate of the overall reaction is the rate of
  the slowest (rate determining) step.

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Rate Laws for Elementary Steps
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Overall Reaction Intermediates Catalysts
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