Ch 12 PPT.2

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Author:
DesLee26
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203772
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Ch 12 PPT.2
Updated:
2013-02-27 09:40:04
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CHM 112
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Test Two
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  1. For a first-order reaction, the half-life is independent of hte ___. Each successive half-life is __.
    • initial concentration
    • an equal period of time
  2. Decay rate
    -DeltaN/ deltat= kN
  3. A first order reaction exhibits an __ of the reactant concentration.
    exponential decay
  4. 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
  5. 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
  6. Plotting 1/[NO2] versus time gives a __, meaning __.
    • straight-line fit
    • second-order teaction
  7. What is the slope for a second order reaction?
    k
  8. For a second-order reaction, the half-life is __.
    dependent on the initial concentration
  9. Each successive half-life of a second-order reaction is __.
    twice as long as the preceding one
  10. For a zeroth-reaction, the rate is __.
    independent of the concentrtion of the reactant
  11. A plot of [A] versus time for a zeroth reaction will give __.
    a straight line fit and hte slope willl be -k
  12. What is a reaction mechanism?
    a sequence of reaction steps that describes the pathway from reactants to products
  13. What is an elementary reaction (step)?
    a single step in a reactioin mechanism
  14. What does an elementary reaction describe?
    an individual molecular event
  15. What does the overall reaction describe?
    the reaction stoichiometry and is the summation of elementary reactions
  16. What is a reactive intermediate?
    is formed in one step adn consumed in a subsequent step
  17. What are the units of a second order reaction?
    1/MS
  18. what is the rate equal to in a zeroth-order reaction?
    k because the other value drops out since it is just one
  19. What is the slope equal to in a zeroth order reaction?
    -k since its decreasing
  20. In a zero order, what doesn't matter?
    the initial concentration

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