Ch. 17 – Chemical Reactions

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Presentation transcript:

Ch. 17 – Chemical Reactions V. Reaction Rate (p. 532 - 541) C. Johannesson

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 C. Johannesson

Unsuccessful Collisions A. Collision Theory Particle Orientation Required Orientation Unsuccessful Collisions Successful Collision C. Johannesson

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

A. Collision Theory Activation Energy depends on reactants low Ea = fast rxn rate Ea C. Johannesson

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 C. Johannesson

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

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

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

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

B. Factors Affecting Rxn Rate Enzyme Catalysis C. Johannesson