'Slowest step' diaporamas de présentation

Kinetics

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Chemical kinetics: accounting for the rate laws

Chemical kinetics: accounting for the rate laws. ?????? ??? ?? ? ??. The approach to equilibrium. Forward: A ? B Rate of formation of B = k r [A] Reverse: B ? A Rate of decomposition of B = k r ? [ B ]. Net r ate of formation of B = k r [A] ? k r ? [ B ].

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Improving Memory Access: the Cache

EECS 322 Computer Architecture. Improving Memory Access: the Cache. Instructor: Francis G. Wolff wolff@eecs.cwru.edu Case Western Reserve University This presentation uses powerpoint animation: please viewshow. Review: Models.

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Nucleophilic Substitutions and Eliminations

Nucleophilic Substitutions and Eliminations. Final CHEM 4A Review. Alkyl Halides React with Nucleophiles and Bases. Alkyl halides are polarized at the carbon-halide bond, making the carbon electrophilic

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Rates and reaction mechanism

Rates and reaction mechanism. The reaction mechanism is the sequence of individual reaction steps that together complete the transformation of reactants to products The single reaction described by chemical equation may involve several sequential elementary steps. Reduction of NO 2 by CO.

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Chapter 17

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Teacher Prep

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Understanding reaction mechanisms (an analogy)

Describes in great detail the order in which bonds are broken and formed and the changes in relative position of the atoms during the course of reaction. Understanding reaction mechanisms (an analogy).

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Enzymes: Protein Catalysts

Enzymes: Protein Catalysts. Increase rates of reaction, but not consumed. Enable reactions to occur under mild conditions: e.g. temperature, pH. High reaction specificity: no side products. Activity of enzymes can be regulated. Substrate Availability of enzyme (expression, localization)

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CHEMICAL KINETICS

CHEMICAL KINETICS. Chemical kinetics: is a branch of chemistry which deals with the rate of a chemical reaction and the mechanism by which the chemical reaction occurs. Rate of Reaction. How fast a reaction occurs

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Chemical Kinetics

Chemical Kinetics. The area of chemistry that concerns reaction rates and reaction mechanisms. Reaction Mechanism. The reaction mechanism is the series of elementary steps by which a chemical reaction occurs.

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Reaction Mechanisms

Reaction Mechanisms. Steps of Reactions using Rate Laws. What is a mechanism?. A reaction mechanism is a description of the path, or sequence of steps , by which a reaction occurs. . START. END. REACTION MECHANISM. START. END. Example: Decomposition of O 3.

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Reaction mechanisms

Reaction mechanisms. Are one-step or multi-step pathways that a reaction follows, indicating the order in which collisions occur A re best-guesses at how the reaction occurs and can only be determined from the experimentally determined rate law . Reaction mechanisms.

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Reaction Mechanism

Reaction Mechanism. The reaction mechanism is the series of elementary steps by which a chemical reaction occurs. The sum of the elementary steps must give the overall balanced equation for the reaction The mechanism must agree with the experimentally determined rate law.

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Sequential Reactions and Intermediates (25.7)

Sequential Reactions and Intermediates (25.7). Sequential reactions (elementary) involve multiple reactions in which one or more intermediates are formed The differential form of the rate is written with respect to product formation

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