'Rate determining step' presentation slideshows

Chapter 10 Chemical Kinetics II. Composite Mechanisms

Chapter 10 Chemical Kinetics II. Composite Mechanisms. ~Chapter 9 dealt with the more important basic principles of chemical kinetics. To a considerable extent, but not entirely, it dealt with elementary reactions that occur in a single step; the reactant molecules

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Chemistry 102(01) Spring 2012

Chemistry 102(01) Spring 2012. CTH 328 9:30-10:45 am Instructor : Dr. Upali Siriwardane e-mail : upali@latech.edu Office : CTH 311 Phone 257-4941 Office Hours : M,W 8:00-9:00 & 11:00-12:00 am; Tu,Th,F 8:00 - 10:00 am.. Exams: 9 :30-10:45 am, CTH 328.

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Half Life I messed up, sorry

Half Life I messed up, sorry. Webassign HW The decomposition of SO 2 Cl 2 is first order in SO 2 Cl 2 , and the reaction has a half-life of 255 min at 600 K. SO 2 Cl 2 (g) ? SO 2 (g) + Cl 2 (g)

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Preparation of Alkyl Halides (schematic)

Preparation of Alkyl Halides (schematic). Alkanes - Alkyl Halides (free-radical halogenation) Alkenes - Alkyl Halides (hydrohalogenation via HX or allylic bromination using NBS) Alkenes - Alkyl Dihalides ( vic dihalogenation via X 2 ) Alkenes - Mixed Substituted Alkyl Halides

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Chemical Kinetics

Chemical Kinetics. Kinetics. Studies the rate at which a chemical process occurs. Besides information about the speed at which reactions occur, kinetics also sheds light on the reaction mechanism (exactly how the reaction occurs). Outline: Kinetics. Factors That Affect Reaction Rates.

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UNIT I

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Chapter 6 Chemical Kinetics

Chapter 6 Chemical Kinetics. 1. Kinetics. Why? Studies the rate at which a chemical process occurs. Besides information about the speed at which reactions occur, kinetics also sheds light on the reaction mechanism (exactly how the reaction occurs). 2. Factors That Affect Reaction Rates.

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5.14 Dehydrohalogenation of Alkyl Halides

5.14 Dehydrohalogenation of Alkyl Halides. H. Y. C. C. C. C. ? -Elimination Reactions Overview. dehydrogenation of alkanes: ? H; Y = H dehydration of alcohols: ? H; Y = OH dehydrohalogenation of alkyl halides: ? H; Y = Br, etc. +. Y. H. ?. ?. H. Y. C. C. C. C.

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Dehydrohalogenation of Alkyl Halides

Dehydrohalogenation of Alkyl Halides. X. Y. C. C. C. C. b -Elimination Reactions Overview. dehydrogenation of alkanes: X = Y = H dehydration of alcohols: X = H; Y = OH dehydrohalogenation of alkyl halides: X = H; Y = Br, etc. +. Y. X. a. b. X. Y. C. C. C. C.

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REACTIONS OF ALKYL HALIDES

REACTIONS OF ALKYL HALIDES. Alkyl halides (R-X) undergo two types of reactions : substitution reactions and elimination reactions. In a substitution reaction, the X group in R-X is replaced by a different group, e.g. R-X ?R-OH +X ?

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AP chemistry Kinetics

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Rate Laws

Rate Laws. Rate Laws. Rate = k [A] x [B] y [A] and [B] represent the concentrations of reactants x and y often (but not always) represent the coefficients in front of [A] and [B] k is a constant specific to the reaction. Rate Laws. Rate = k [A] x [B] y k

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Kinetics

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Organic REACTIONS

Chapter 10. Organic REACTIONS. Alkanes. Saturated hydrocarbons where carbons in the chain are singly bonded to one another Ex: Methane Ethane Propane Butane Pentane Hexane Reactivity : relatively low Carbon-hydrogen bond relatively strong (relatively high bond energy)

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Reaction mechanisms

Reaction mechanisms. Many reactions proceed via a series of steps called a mechanism. A + B → C + D. Fast. C + D → E + F. Slow. E + F → G. Fast. It is highly unlikely that these steps have the same rate. Rate determining step.

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Integrated rate laws

Integrated rate laws. ln[ A ] = -k t + ln[ A ] 0. rate = k[ A ]. 1/[ A ] = k t + 1/[ A ] 0. rate = k[ A ] 2. Reaction mechanism. ? Elementary steps. reaction =. Molecularity. Elementary step. rate law. uni molecular . A ? product . k[ A ]. A + B ? product . bi molecular .

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Reaction Mechanisms

Reaction Mechanisms. Reaction Mechanism. Reactions occur by a series of steps = Reaction mechanism Example: Overall reaction: NO 2 + CO ? NO + CO 2 occurs by following steps Step 1: Step 2:. Intermediates. Two molecules of NO 2 collide

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Testing a Mechanism: Kinetic Isotope Effects

Testing a Mechanism: Kinetic Isotope Effects. Primary Isotope Effect - rate change due to isotopic substitution at a site of bond breaking or bond making in the rate determining step of a mechanism.

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Reaction Mechanisms

Reaction Mechanisms. -- the processes by which reactions occur. --. i.e., what happens in getting from R to P. -- sometimes, mechanisms are dependent on temp. CH 3 CN CH 3 NC. NO + O 3 NO 2 + O 2. elementary steps (or elementary reactions) :.

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Kinetics

Kinetics. 2000D By: Charles Liao. 2000D. a. Referring to the data in the table below, calculate the standard enthalpy change, for the reaction at 25 ?C. O 3(g) + NO (g) ? O 2(g) + NO 2(g) ?H =33 (kJ mol-1) -(143+90) (kJ mol-1) =-200 (kJ mol-1). 2000D.

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