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OCR Chemistry F322~ 4th June 2013~ AS Chemistry Watch

  • View Poll Results: How did you find the exam
    Hard A= 72
    42
    15.22%
    It was okay A= 76
    99
    35.87%
    Easy A= 79
    75
    27.17%
    Very Easy A=82
    60
    21.74%

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    (Original post by bliam)
    I didnt write what it was called, I said what functional group it would have and drew the structure? Marks?
    That's fine, thats what I did, you would be awarded full marks
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    (Original post by Beanjamin)
    Who are you calling a prick lmao, I was being friendly - hence the smiley face...
    lool he's mad, its not usually in the low 70's for a easy paper... its gonna be around 80 i think. Average mark
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    Serious note what is full UMS going to be like?
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    (Original post by niceguy95)
    No

    The molecular number given was 72

    Empirical formuula was c4h80 which has mr of 72

    72/72 = 1 so the moevular formula was the same

    C=o was resent but o-h was not

    So it's either ketone or aldehyde
    That is exactly what i put!! YAY
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    (Original post by amin666)
    Butanal and 2 ethyle propanal
    i got that too butanal and 2methylpropanal dyu think this would be right as most got butanal and butanone
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    (Original post by Saif95)
    The space for the five marker where you had to identify the two structures was very small, I had to squeeze the answers in...:mad:
    ikr!
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    (Original post by zangorou)
    Lovely paper.. Apart from the 250dm3 enthalpy change one. I put 1630 (ish), what did everyone else get?
    It was 240dm cubed so it was 240/24 = 10moles then 5 x delta H which give you something in the 800's
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    For anyone who is interested, the average grade boundary for this specification over the past 7 exams has been 77/100 for an A [may be skewed though because the lowest is quite low].

    The maximum grade boundary has been 83/100 for an A and the minimum grade boundary has been 71/100 for an A.

    This paper was ok i thought, except for the question where you had to draw in the 4 boxes D: Just have to wait and see!
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    (Original post by SamuelJ)
    Conditions of fermentation?
    I put presence of yeast and 37°C but I'm not sure whether the first one is a 'condition' and the second one is absolutely necessary - just an optimum?
    i put yeast a 25-45C, anaerobic without oxygen.
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    (Original post by Smko)
    Serious note what is full UMS going to be like?
    Probably 97+
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    (Original post by cyiarik)
    For anyone who is interested, the average grade boundary for this specification over the past 7 exams has been 77/100 for an A [may be skewed though because the lowest is quite low].

    The maximum grade boundary has been 83/100 for an A and the minimum grade boundary has been 71/100 for an A.

    This paper was ok i thought, except for the question where you had to draw in the 4 boxes D: Just have to wait and see!
    i'm putting money on it being 81-82/100 for an A
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    (Original post by bliam)
    I did! But I only drew them out :/
    Yh, i drew them out too.
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    (Original post by bambi77122)
    oh no i think i've already lost 10 marks
    I probably lost a good ******* 30-40
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    For the free radical substitution could you not do CH3. +I2 --> CH3I + I.
    As the second propagation step
    Because I2 could be formed in a termination step? I. + I. --> I2
    oh my


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    Can see this being 83 for an A like January 2012 tbh... The content wasn't too bad, but there were so many little marks that were easy to drop


    This was posted from The Student Room's iPhone/iPad App
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    what did people put for the last question on increase in tempreture and a catalyst added?
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    (Original post by massi1296)
    i got that too butanal and 2methylpropanal dyu think this would be right as most got butanal and butanone
    i put this
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    (Original post by Smko)
    Serious note what is full UMS going to be like?
    Probably about 94 UMS because in june 2011 it was 94 for Full UMS and looking through June 2011 it was of a Similar difficultly level.
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    Combustion Definition:

    I put the enthalpy change when a 1 mole of substance completely reacts with oxygen in standard conditions and states.
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    (Original post by the A* guy)
    Probably about 94 UMS because in june 2011 it was 94 for Full UMS and looking through June 2011 it was of a Similar difficultly level.
    how you know 94 for full?
 
 
 
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