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V. Reaction Rate (p. 562 – 565 & 568 – 570)

Ch. 17 – Chemical Reactions. V. Reaction Rate (p. 562 – 565 & 568 – 570) . A. Collision Theory. Reaction rate depends on the collisions between reacting particles. Successful collisions occur if the particles... collide with each other have the correct orientation

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V. Reaction Rate (p. 562 – 565 & 568 – 570)

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  1. Ch. 17 – Chemical Reactions V. Reaction Rate(p. 562 – 565 & 568 – 570)

  2. A. Collision Theory • Reaction rate depends on the collisions between reacting particles. • Successful collisions occur if the particles... • collide with each other • have the correct orientation • have enough kinetic energy to break bonds

  3. A. Collision Theory • Particle Orientation Required Orientation Unsuccessful Collisions Successful Collision

  4. A. Collision Theory Activation Energy • Activation Energy (Ea) • minimum energy required for a reaction to occur

  5. A. Collision Theory Ea • Activation Energy • depends on reactants • low Ea = fast rxn rate

  6. B. Factors Affecting Rxn Rate • Surface Area • high SA = fast rxn rate • more opportunities for collisions • Increase surface area by… • using smaller particles • dissolving in water

  7. B. Factors Affecting Rxn Rate • Concentration • high conc = fast rxn rate • more opportunities for collisions

  8. B. Factors Affecting Rxn Rate • Temperature • high temp = fast rxn rate • high KE • fast-moving particles • more likely to reach activation energy

  9. B. Factors Affecting Rxn Rate • Temperature Analogy: 2-car collision 5 mph “fender bender” 50 mph “high-speed crash”

  10. B. Factors Affecting Rxn Rate • Catalyst • substance that increases rxn rate without being consumed in the rxn • lowers the activation energy

  11. B. Factors Affecting Rxn Rate • Enzyme Catalysis

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