order of reaction~

ippie

ippie
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Jun 12, 2006
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  1. Pre-Dental
    A reaction was found to have a half life that depended on the initial concentration of the reactant. For this reaction, which one of the following plots might be linear?

    a. ln[A] vs. t
    b. 1/[A] vs. t
    c. both plots are linear.
    d. neither plot is linear
     

    poc91nc

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    1. Dental Student
      Well, we know that first order (choice a) is out of the question since it doesn't depend on initial concentration. Remember the equation for a first order process -2.3log(N/N') = kt initial concentrations will cancel out with substitution. Or you can just use 0.7/k = half life. Second order half life does depend on initial rate. I'd go with choice b which is the linear format for a second order reaction.

      1/[A] - 1/[A]' = kt
       
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