Collision Theory

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Collision Theory Factors Affecting Reaction Rate
2
Kinetic Molecular Theory

• The Kinetic Molecular Theory states that
• All particles are in constant motion
• Collisions are happening between
• Other particles
• Walls of the container

3
Collision Theory

• Not all collisions lead to a reaction, in fact
  most collisions do not lead to a reaction
• For a reaction to occur, there must be an
  effective collision between reactants
• Correct orientation of molecules
• Sufficient energy

Rate collision frequency X fraction effective
4
Correct Orientation
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Correct Orientation
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Sufficient Energy

• In most reactions, only a small fraction of the
  total collisions have sufficient energy to
  overcome the activation energy (EA) of a reaction
• Activation energy
• the minimum collision energy required for a
  reaction to occur
• depends on the kinetic energy of the colliding
  particles

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Maxwell Boltzman Distribution
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Potential Energy Diagrams
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Consolidate

• Read p. 383-387
• P. 387 1
• Worksheet Potential energy diagram factors
  that affect reaction rate