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Reaction Rates

Reaction Rates. Factors, Activation Energy, Le Chatelier’s Principle, Kinetic-Molecular Theory, Collisions Theory of Gases. Factors Affecting Reaction Rates. Temperature - hotter temps react faster Surface area – smaller pieces react faster

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Reaction Rates

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  1. Reaction Rates Factors, Activation Energy, Le Chatelier’s Principle, Kinetic-Molecular Theory, Collisions Theory of Gases

  2. Factors Affecting Reaction Rates • Temperature - hotter temps react faster • Surface area – smaller pieces react faster • Catalysts – speeds up reaction • Inhibitors – slows down reaction • Concentration – higher conc speeds up reaction • Nature of reactants – more reactive elements speed up reaction

  3. Activation Energy • Definition: the minimum amount of energy required to start a chemical reaction Energy of activation

  4. LeChatelier’s Principle • Deifinition: when a system at equilibrium is subjected to a stress, the system will shift its equilibrium point in order to relieve the stress • Stresses include a change in: • Pressure • Concentration • Temperature

  5. Kinetic-Molecular Theory • Definition: explains that the behavior of physical systems depends on the combined actions of the molecules constituting the system • Expansion, Fluidity, Low Density, Compressibility, Diffusion and Effusion

  6. Collisions Theory of Gases • Definiton: the number of new compounds formed in a chemical reaction is equal to the number of molecules that collide, multiplied by a constant that corrects for low-energy collisions • Must be the right speed (activation energy requirement), and right orientation (direction)

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