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OCR (Salters) AS Chemistry: Unit F332 (Post exam discussion Jan 2010) watch

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    (Original post by Tzarchasm)
    I felt the wording of the questions were a bit vague. Last year's one was easier to understand.
    I think I've got a maximum of a C. I'm wondering does anyone know if i can take another resit in june of this paper. I really need a B overall
    yeah you can retake it again
    i thought a few of the questions were a bit rubbish
    but on the whole, it was pretty good!!
    hoping for 85/90%
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    (Original post by Unknown111)
    Yup that works well.

    So everyone, what do you reckon your grades are assuming the grade boundry is about 80/100 for A, 70/100 for B and so on.

    I reckon I got between mid B worse-mid A best.
    Well since I was only a couple of marks off an A, a high A would be nice. :o:
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    (Original post by HotCoco.)
    It was propan 2 one. There was no broad OH peak to suggest the product was a carboxylic acid. Only a C=O bond. So a ketone must have formed.
    Technically, it's just propanone, since there are no structural isomers of propanone, so there's no need to add the 2, since you can't have propan-1-one.

    But oh wells
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    There's a trick to the question where you had to draw the structure of the ester.
    I noticed when I went back through my paper before it finished.

    It asked you to draw the ester formed when reacting H2SO4, the alchohol used was a dialcohol, meaning you had to draw a diester, with to carboxylic acids joint to it. It evensaid in the question, to form an ester with the molecular formula of C6HxO4.
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    anyone remember what compound E was in Question 6? I think I got that bit wrong.
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    I messed up the ester question. Saw the C6 H10 O4 and decided to be clever and point this out to the invigilators that there maybe a mistake. Come out of the exam hall and realise what a dunce i was.

    I remember getting a really really low atom economy for the H2O2 question, sth like 1.50%. Did anyone else get something similar?

    This paper had a lot more writing on it compared to the one in the summer, and I expect to have lost 5-10 marks, so hopefully i manage to get an A.
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    (Original post by major-major-major)
    I messed up the ester question. Saw the C6 H10 O4 and decided to be clever and point this out to the invigilators that there maybe a mistake. Come out of the exam hall and realise what a dunce i was.

    I remember getting a really really low atom economy for the H2O2 question, sth like 1.50%. Did anyone else get something similar?

    This paper had a lot more writing on it compared to the one in the summer, and I expect to have lost 5-10 marks, so hopefully i manage to get an A.
    Awww I thought that at first, but then I realised my mistake.

    And no, I got 12.7%
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    I think it went reasonably well. I really can't tell, though. I thought it was quite a nice paper, but some questions were a bit weird. I'm really hoping for an A, a high one hopefully. I got a C last time D;
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    (Original post by Keorl)
    anyone remember what compound E was in Question 6? I think I got that bit wrong.
    for E i got Propan-1-ol
    And F i got Propanone- ketone

    what did u get?
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    (Original post by AnthonyShock)
    There's a trick to the question where you had to draw the structure of the ester.
    I noticed when I went back through my paper before it finished.

    It asked you to draw the ester formed when reacting H2SO4, the alchohol used was a dialcohol, meaning you had to draw a diester, with to carboxylic acids joint to it. It evensaid in the question, to form an ester with the molecular formula of C6HxO4.
    The main give-away to that question was the fact it told you it was reacting in excess ethanoic acid, indicating that a diester would be produced.
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    (Original post by Keorl)
    anyone remember what compound E was in Question 6? I think I got that bit wrong.
    propan-2-ol
    got converted into propan-2-one (or propanone)
    x
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    yh i got the same...
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    (Original post by xXxBaby-BooxXx)
    And no, I got 12.7%

    I knew it, come on to TSR and then slowly find out that you have messed the exam up again.
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    (Original post by major-major-major)
    I messed up the ester question. Saw the C6 H10 O4 and decided to be clever and point this out to the invigilators that there maybe a mistake. Come out of the exam hall and realise what a dunce i was.

    I remember getting a really really low atom economy for the H2O2 question, sth like 1.50%. Did anyone else get something similar?

    This paper had a lot more writing on it compared to the one in the summer, and I expect to have lost 5-10 marks, so hopefully i manage to get an A.
    my atom economy was 14.6%
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    (Original post by major-major-major)
    I knew it, come on to TSR and then slowly find out that you have messed the exam up again.
    Haha I know, I don't know why we do it to ourselves.... :/
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    (Original post by Keorl)
    yh i got the same...
    yay us :woo:
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    (Original post by nameless_one)
    propan-2-ol
    got converted into propan-2-one (or propanone)
    x
    your DO NOT CLICK ON THIS IS is very funny lol!
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    (Original post by hupper12345)
    your DO NOT CLICK ON THIS IS is very funny lol!
    lol
    thanks x
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    (Original post by nameless_one)
    my atom economy was 14.6%
    The question gave you the molecular masses of all products, but the only two you needed to use was H2O2 (34) and BaSO4 (233.4)

    The calculation is just:

    [34/(34+233.4)]*100 = 12.7%

    You forgot to add the 34 on the bottom, you just did (34/233.4)*100.
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    (Original post by Dem Chem)
    The gram calculation at the end?
    I got like 3.638g
 
 
 
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