2009 AP Worked Answers and 2009 Exam Comments

May 14, 2009
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Categories: AP

Here they are in DRAFT form. Comments encouraged and please point out my errors!

2009 Exam Comments

2009, 1

2009, 2

2009, 3

2009, 4

2009, 5

2009, 6

5 Comments

  1. webmaster

    A couple of extra points since posting at around 6.00 PM last night.

    I tidied up the calculations in question 2 in terms of sig figs and I added the the principal quantum number “3” to my answer to question 6(c) (thanks Ben). Hopefully that will not be necessary to get all of the points, but we’ll see.

    Reply
  2. Modox

    In 6(c) I understand 3p as the answer given “atomic” as the qualifier, but is this, in fact, true about H2S? It appears that I never learned this, if true – I’ve been teaching H2S as an example of sp3 hybridization of sulfer with a (less than) 109.5 degree bond angle. I’m confused and surprised that I missed this!

    Reply
  3. webmaster

    Modox writes;

    >In 6(c) I understand 3p as the answer given “atomic” as the qualifier, but is this, in fact, true about H2S? It appears that I never learned this, if true – I’ve been teaching H2S as an example of sp3 hybridization of sulfer with a (less than) 109.5 degree bond angle. I’m confused and surprised that I missed this!

     

    Well, without “looking it up” I have NO idea, and frankly nor should I (NOR should you)! There is NO way that this question is going to be asked WITHOUT the qualifier of giving the bond angle, which in turn suggests that sp3 hybridization is NOT the answer. I think that using the word “atomic” is going too far since it gives the game away. My point is that there is no way this “factoid” about H2S is going to be part of the “normal” knowledge base of AP teachers let alone AP students.

    Reply
  4. Modox

    Well, then I totally agree – I do not understand why this question would be asked on an AP exam!

    Reply
  5. Joseph

    Question 1 has a typo. Part (d) section (ii) is incorrectly identified.

    Thanks for your work; I look forward to grading the exam this year for the first time.

    Reply

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