• Advice You're Thankful for Contest

    Now that it's getting close to Thanksgiving, we're running a contest to hear advice you've received that you're most thankful for! This can be any type of advice and the advice with the most reactions will win!

    JOIN CONTEST

rate of reaction

chiddler

Full Member
10+ Year Member
Apr 6, 2010
2,439
4
  1. Medical Student
    I3A0G.png





    Answer: A

    My question: Why isn't B the answer?
     

    Dasypus

    Full Member
    Apr 25, 2011
    193
    2
      Where did you get this question from?

      From the looks of it, the answer they want takes into account all of the reactants before the slow step (B doesn't count, because it's also a product).

      Edit: after some searching around: you're right. Intermediates don't go into the rate law. Rather, you have to express their concentrations in terms of the reactants that formed them. http://www.science.uwaterloo.ca/~cchieh/cact/c123/ratemech.html

      So k2[BC] needs to have that 'translated'; and its concentration is k1[A2][BC]. Thus the rate law k'[A2][BC][BC]
       
      Last edited:
      About the Ads
      This thread is more than 9 years old.

      Your message may be considered spam for the following reasons:

      1. Your new thread title is very short, and likely is unhelpful.
      2. Your reply is very short and likely does not add anything to the thread.
      3. Your reply is very long and likely does not add anything to the thread.
      4. It is very likely that it does not need any further discussion and thus bumping it serves no purpose.
      5. Your message is mostly quotes or spoilers.
      6. Your reply has occurred very quickly after a previous reply and likely does not add anything to the thread.
      7. This thread is locked.