# Ch 12 PPT.2

 For a first-order reaction, the half-life is independent of hte ___. Each successive half-life is __. initial concentrationan equal period of time Decay rate -DeltaN/ deltat= kN A first order reaction exhibits an __ of the reactant concentration. exponential decay What is the plot of ln[A]? Slope? a first -order reaction exhibits a linear decay of the logarithm fo the reactant concentration (however, an exponential decay occurs without the ln and just the reactant concentration)the slope is -k For a second order reaction, what is theplot of ln[NO2]? it is a curve and not a straight-line fit; therefore, it's not a straight-line fit Plotting 1/[NO2] versus time gives a __, meaning __. straight-line fitsecond-order teaction What is the slope for a second order reaction? k For a second-order reaction, the half-life is __. dependent on the initial concentration Each successive half-life of a second-order reaction is __. twice as long as the preceding one For a zeroth-reaction, the rate is __. independent of the concentrtion of the reactant A plot of [A] versus time for a zeroth reaction will give __. a straight line fit and hte slope willl be -k What is a reaction mechanism? a sequence of reaction steps that describes the pathway from reactants to products What is an elementary reaction (step)? a single step in a reactioin mechanism What does an elementary reaction describe? an individual molecular event What does the overall reaction describe? the reaction stoichiometry and is the summation of elementary reactions What is a reactive intermediate? is formed in one step adn consumed in a subsequent step What are the units of a second order reaction? 1/MS what is the rate equal to in a zeroth-order reaction? k because the other value drops out since it is just one What is the slope equal to in a zeroth order reaction? -k since its decreasing In a zero order, what doesn't matter? the initial concentration AuthorDesLee26 ID203772 Card SetCh 12 PPT.2 DescriptionTest Two Updated2013-02-27T14:40:04Z Show Answers