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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 Farringtonn)
    For the branched ten chain alkene would it be ok if I did two beaches I did 2,3-dimethyloctane?


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    i did the exact same molecule, (didnt know what 9 carbons was called lmao)
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    (Original post by alice.o123)
    that's what I put There are quite a few termination steps for this reaction, you could have had
    CH3. + Br. --> CH3Br
    CH3. + I. --> CH3I
    CH3. + CH3. --> C2H6
    I. + I. --> I2
    Br. + Br. --> Br2
    I. + Br. --> IBr
    as long as two radicals came together to form one product that is not a radical it's a termination step i think
    Sweet
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    (Original post by nothepreacher)
    wait a minute..on the % yield question the product forming was 11.13 kg and the moles of propene was 220 right? So how could you get 95% yield?
    1130g/the mr = 210

    (210/220)*100 = 95.45
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    The % yield was 95.45..... . Do I get marks for just writing 95%. I did show the full decimals in method, but wrote final answer as 95%
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    (Original post by nothepreacher)
    wait a minute..on the % yield question the product forming was 11.13 kg and the moles of propene was 220 right? So how could you get 95% yield?
    The Mr was 53 so (11.13x10^3)/53 = 210

    210/220 x 100 = 95.45%
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    That was a good paper, better than I thought it would be.
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    (Original post by nothepreacher)
    wait a minute..on the % yield question the product forming was 11.13 kg and the moles of propene was 220 right? So how could you get 95% yield?
    (210/220)x100 = 95.45454545%
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    (Original post by amin666)
    was it S8 ? the M/z one?
    I put S8, then S4 for the next 1
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    Also what did people get for molecular formula of G?
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    (Original post by Dizzie31)
    if there was 164 for 2 moles, wouldn't x by 10 give you 20 moles?
    yeah so youd get 3280 for 2 moles therefore 1640 for 1
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    The question where you had to use mcdelta t, in the first part did you have to divide by 1000 because it said kilo joules


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    Great I keep realizing I lost more mark than I thought
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    did you have to put s4+ cos i just put s8 and s4 aswell
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    Was the flowchart where heated with acid catalyst the e and z isomers ?


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    (Original post by Liberty.)
    As long as they can make out my puny hydrogen atoms skeletal confused me too much for that one.
    yhh think they will mark it right, but i left mine in skeletal to be on the safe side
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    (Original post by yodawg321)
    My face when I saw the 7 marker Boltzman Distrubtion at the end :
    Smooth :dance::excited:
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    (Original post by massi1296)
    did you have to put s4+ cos i just put s8 and s4 aswell
    i forgot the +
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    (Original post by jacksonmeg)
    i did the exact same molecule, (didnt know what 9 carbons was called lmao)
    same thought went through my head ahhah
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    (Original post by jacksonmeg)
    I put S8, then S4 for the next 1
    Shouldn't it be S4+ ?? because its a fracture
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    (Original post by jacksonmeg)
    i did the exact same molecule, (didnt know what 9 carbons was called lmao)
    Haha I done the exact same I didn't know what the name was for nine carbons haha



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