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Homework Help: 2001 free response Question [ ]

  1. Feb 19, 2008 #1
    2001 free response Question [urgent]

    Hello Physics forum-
    Over the past couple of hours ive been trying to solve an AP Chem problem. I'm self studying for the AP exam and i got a copy of a bunch of past free response questions to help me study. Most are hard, and without a class, its even harder to understand. So now, after a lot of trial and error, I decided to ask this forum. Please help in any way, shape or form. I'm still not 100% sure how to even approach this problem, and I'd appreciate ANY input.

    I scanned the problem to make it easier for all of us:

    http://img168.imageshack.us/img168/1974/57575757557copysi8.jpg [Broken]

    Thank you.
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Feb 20, 2008 #2


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    Homework Helper
    Gold Member

    I'll get you started...

    In the reaction you have on the reagent side, iodide (iodine in the -1 oxidation state). On the product side you have [tex]I_3^-[/tex]. What is the oxidation state of iodine in [tex]I_3^-[/tex]?

    What is the oxidation state of the sulfur in peroxysulfate? In sulfate?

    From there you should be able to answer a).
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