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Exam3ReviewW2014 - CHEM162:Exam3StudyGuide...

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CHEM 162 Exam 3 Review page 1 of 4 CHEM 162: Exam 3 Study Guide CHAPTER 15: Chemical Kinetics chemical kinetics: study of the factors that influence reaction rates reaction rate: a positive quantity expressing the concentration change with time Use experimental data given to determine a general reaction rate given concentrations of reactants/products over time determine the rate of disappearance/ consumption of a reactant or rate of appearance/production of a product given the rate of disappearance/appearance of another reactant/product in the reaction Determine reaction rate Given experimental data of concentrations and time. Know the terms: rate law, rate constant (k) Reaction Order : zero order, first order, second order Determine overall order for a reaction given rate law. Distinguish between the instantaneous reaction rate and the average reaction rate . Determine rate law using initial rates method Given data of concentrations and rates. Cannot be determined given only the balanced chemical equation. half life (t 1/2 ): the time required for the concentration of a reactant to decrease by half Determine the reaction order given experimental data of reactant concentration over time . Recognize the plots giving a straight line for zero order, first order, and second order reactions. Determine the reaction order given experimental data of reactant concentration over time (Continued) Recognize that the half life is only constant for first order reactions . Compare slopes for the first and last sets of data to see if slope changes for each reaction order. Do calculations given integrated rate laws for zero order, first order, and second order reactions. Solve for concentration at a given time given initial concentration and rate constant. Carry out natural log (ln) calculations for 1 st order reactions—review your algebra! Solve for the time required for the concentration to decrease to a given amount. Solve for half life given rate constant, k, or vice versa. COLLISION MODEL/THEORY: reactant molecules must collide to react Activation Energy (E a ): minimum energy needed for chemical reaction Reaction Rate and Temperature As T , reaction rate since molecules move faster and more molecules have activation energy.
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