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General Chemistry week of 2/22

by: Audrey Notetaker

General Chemistry week of 2/22 111001

Marketplace > Boston College > Chemistry > 111001 > General Chemistry week of 2 22
Audrey Notetaker
GPA 3.9
General Chemistry II
Neil Wolfman

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Chapter 13: rate laws, arrhenius equation, and catalysts
General Chemistry II
Neil Wolfman
Class Notes
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This 0 page Class Notes was uploaded by Audrey Notetaker on Friday February 26, 2016. The Class Notes belongs to 111001 at Boston College taught by Neil Wolfman in Fall 2016. Since its upload, it has received 30 views. For similar materials see General Chemistry II in Chemistry at Boston College.


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Date Created: 02/26/16
Chapter 13 The Arrhenius Equation 22216 First Order LogAt k2303t logA0 Second Order 1 At kt 1A0 Zero Order At kt A0 k is the rate constant and is temperature dependent Collision Theorv in order for reactions to occur the reactants A and B must collide with enough activation energy Ea and with the correct orientation Activated complex transition to go from reactants to products molecules must go through intermediate high energy state to weaken the bond and rotate the molecule Rate constant k pzf Z frequency of collisions high temperature high 2 F fraction of molecules with enough activation energy to react high temperature high f considered the exponential factor because its value has the greatest impact on rate according to temperature high Ea low frequency P orientation factor Frequency factor f equotEaRT k AequotEaRT Arrhenius Equation lnk2kl EaR 1T 1 UT 2 Arrhenius Plot Equation lnk EaR 1T lnA A number of times the reactants approach the activation energy barrier preexponential frequency factor Activation Energv Ea energy required to reach the activated complex High Ea low reaction rate Chapter 13 Molecular Mechanism 22416 Unimolecular elementary step one reactant decomposition is dependent on which bond the energy from a collision or absorption of a photon will break Bimolecular elementarv step two reactions most common Termolecular elementarv step three reactants not very common third reactant carries away excess energy so product is more stable if you know a reaction has elementary steps then the rate law is predictable Molecular Mechanism what is the series of elementary steps If the mechanism doesn t fit the rate law then it s definitely wrong if it does fit then it may or may not be wrong if the rate law is inconsistent with the coefficients on reactions in equation then the reaction has more than one elementary step the kinetics of the slow elementary step determines the rate of the overall reaction Chapter 13 Catalysis 22616 Enzymes protein catalyst catalyzes reactions that take place in the body by decreasing the overall activation energy Homogeneous all takes place in the same state Heterogeneous takes place in multiple states Physical absorption of catalyst weak intermolecular forces Chemsorption of catalyst strong intermolecular forces Asymmetric carbon bonded to four different substituents


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