Lecture 9 (Pseudo-First Order Reactions)

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Department
Chemistry & Chemical Biology
Course
CHEM 1214
Professor
Thomas Gilbert
Semester
Spring

Description
Lecture 9 (1/28/13) • Pseudo­First Order Reactions: o All reactants but one are present at such high concentrations that they do  not change significantly during the course of reaction o Reaction rate is determined by the concentration of the limiting reactant. • Factors Affecting Reaction Rate: o Concentration of reactants:  Increased frequency of collisions.  Defined by rate law. o Energy of collisions:  Energy needed to break bonds in reactants, allowing new bonds to  form. o Orientation of colliding molecules o Temperature:  Increased temperature increases kinetic energy of molecules,  molecular collisions. o Activation Energy (a ):  Minimum energy of molecular collisions required to break bonds  in reactants, leading to formation of products. o These factors incorporated into rate constant k by Arrhenius  Equation. • Arrhenius Equation: −E aRT                         o R = universal gas constant (in J/mol∙K). o T = temperature (in
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