Collision Theory. Reactions are fastest with… 1.Large Ea, Large T 2.Low Ea, Large T 3.Large Ea, Low T 4.Low Ea, Low T.

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Presentation transcript:

Collision Theory

Reactions are fastest with… 1.Large Ea, Large T 2.Low Ea, Large T 3.Large Ea, Low T 4.Low Ea, Low T

Reaction Coordinate Diagrams

Multistep Reactions

Arrhenius Equation: Temperature and E a Dependence

Example 1. Use the data below to find Ea.

Example 2. A reaction has Ea = 75 kJ/mol. If k = 1.50 x at 25 o C, what is k at 50 o C?

Example 3. A reaction doubles its rate when the temperature increases from 25 o C to 35 o C. What is the activation energy?

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.

Catalysts and Intermediates

Rate Laws for Elementary Steps

SN1 reaction: not in rate law?

Overall Reaction: Intermediates: Catalysts:

What is I - ? 1.Reactant 2.Product 3.Catalyst 4.Intermediate

What is ClO? 1.Reactant 2.Product 3.Catalyst 4.Intermediate