Supplemental Instruction 1060 Hixson-Lied Student Success Center 294-6624 www.si.iastate.edu Chemistry 178 Chemical Kinetics 2 Supplemental Instruction Iowa State University Leader: Alarm Cho Course: Chem 178 Instructor: John Verkade Date: Sep. 08, 2009 Chapter 14 Review Concepts: - Half Life 1. Definition: 2. First order reaction: 3. Second order reaction: - Collision Model 1. From rate law: Temperature, Concentration 2. Orientation 3. Activation Energy - Arrhenius Equation k = Ae-E(a)/RT A = 3 factors incorporated in this equation: a. b. c. - Maxwell Boltzmann distribution - Reaction Mechanisms 1. Elementary reactions 2. Unimolecular, bimolecular, termolecular (rare)- Rate determining step and Rate laws 1. Slow Initial step: Reaction: NO2(g) + CO(g) NO(g) + CO2(g) 2. Fast Initial step: Reaction: 2 NO(g) + Br2(g) 2 NOBr(g) - Catalysis 1. Homogeneous 2 H2O2(aq) 2 H2O(l) + O2(g) 2. Heterogeneous C2H4(g) + H2(g) C2H6(g) 3. Enzymes – “catalase” a. b.
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