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Collision Theory and Reaction Rate. Notes. Rates of Chemical Reactions. The amount of time it takes for a chemical reaction to come to completion is called the reaction rate Reaction rates are different for different reactions They can range from a fraction of a second to days or even years.

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rates of chemical reactions
Rates of Chemical Reactions
  • The amount of time it takes for a chemical reaction to come to completion is called the reaction rate
  • Reaction rates are different for different reactions
    • They can range from a fraction of a second to days or even years
why do different reactions have different rates
Why do different reactions have different rates?
  • The rates of reaction are related to the properties of particles through a model called collision theory
  • Particles will only react if there is an effective or successful collision between them
slide6
The activated complex is a temporary, unstable arrangement of atoms that may lead to products
    • It can be thought of as a transition state between reactants and products
slide7
3. They must collide with a specific minimum amount of energy (activation energy) to form the activated complex
collision theory and rate of reaction
Collision theory and rate of reaction
  • The rate of a reaction can be increased by changing certain factors in a reaction like temperature or concentration of reactants
  • These factors will increase the reaction rate if they produce a greater number of effective collisions
slide9
A greater number of effective collisions can be achieved by anything that
    • Increases the energy of the reactants
    • Lowers the activation energy
    • Produces more collisions per unit of time