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For a first-order reaction, the half-life is independent of hte ___. Each successive half-life is __.
- initial concentration
- an equal period of time
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Decay rate
-DeltaN/ deltat= kN
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A first order reaction exhibits an __ of the reactant concentration.
exponential decay
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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
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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
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Plotting 1/[NO2] versus time gives a __, meaning __.
- straight-line fit
- second-order teaction
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What is the slope for a second order reaction?
k
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For a second-order reaction, the half-life is __.
dependent on the initial concentration
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Each successive half-life of a second-order reaction is __.
twice as long as the preceding one
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For a zeroth-reaction, the rate is __.
independent of the concentrtion of the reactant
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A plot of [A] versus time for a zeroth reaction will give __.
a straight line fit and hte slope willl be -k
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What is a reaction mechanism?
a sequence of reaction steps that describes the pathway from reactants to products
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What is an elementary reaction (step)?
a single step in a reactioin mechanism
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What does an elementary reaction describe?
an individual molecular event
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What does the overall reaction describe?
the reaction stoichiometry and is the summation of elementary reactions
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What is a reactive intermediate?
is formed in one step adn consumed in a subsequent step
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What are the units of a second order reaction?
1/MS
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what is the rate equal to in a zeroth-order reaction?
k because the other value drops out since it is just one
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What is the slope equal to in a zeroth order reaction?
-k since its decreasing
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In a zero order, what doesn't matter?
the initial concentration
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