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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 yodawg321)
    For the flame question on why it was a yellow or blue flame

    I put its because there's a supply of oxygen so it's an complete combustion so gas is being produced (Co2)

    For people who put incomplete combustion I don't understand how because Incomplete releases Carbon Monoxide and its a colourless gas :s
    Incomplete combustion also produces carbon which burns yellow and is black not just carbon monoxide
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    Did anyone got S8 for the mass spec question?
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    (Original post by jacksonmeg)
    isnt it 240/24 = 10 moles, 2 moles = 134 or whatever it was, so 5x134= 1670
    The 2 before N20 doesn't mean 2 moles, I think I just multiplied by 10.


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    One of the easiest papers i've done so far! grade boundaries should be high. What do you guys think!
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    (Original post by Parrot654)
    what did people put for the way that the equilibrium shifted?
    with temp
    with pressure
    with catalyst
    Left left unchanged


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    (Original post by jacksonmeg)
    for the box question, ketone, ester, 2 different alkenes right ?
    yepp thats what i got
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    (Original post by Farringtonn)
    What did people do for the radical substitution?


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    IBr -------> I + Br initiation
    Br + Ch4 ---------> HBr + CH3 propagation
    Ch3 + IBr -------> Br + Ch3I propagation

    Ch3 + Br --------> Ch3br. Termination

    Homolytic fission

    Free radical substitution
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    (Original post by Zzzyax)
    i think i got 98/99 maybe 91 for an A

    lol pipe down
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    (Original post by kingmango)
    I swear I got like +820 for the 24dm3 question? Anyone else get that?

    Nah, it was 1640
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    (Original post by jacobfun)
    The 2 before N20 doesn't mean 2 moles, I think I just multiplied by 10.


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    Nah you times it by 5
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    (Original post by kingmango)
    I swear I got like +820 for the 24dm3 question? Anyone else get that?
    No
    i did 240/24=10 then something like 164/10 = 16.4
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    could you say radical substitution or did you have to say free radical
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    (Original post by FLLF)
    Nah, it was 1640
    thats right, you times it by 5 not 10, the original one had 2 moles already.
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    (Original post by yodawg321)
    Will they allow HCFs instead of HCFCs?
    Maybe, they're called HFCs. I think they will let you off
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    (Original post by jacksonmeg)
    for the box question, ketone, ester, 2 different alkenes right ?
    Yep, thats right
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    (Original post by Ray..)
    What did everyone write for the propagation
    Steps + the one termination steps
    From what I can remeber I did
    CH4 + Br. -> CH3 + HBr
    Ch3 + IBr ->> CH3I + Br.

    Termination
    CH3. + Br. --> CH3Br
    That's right right ??
    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
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    (Original post by FLLF)
    Nah, it was 1640
    It was 820... 1640 would be 20 moles
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    Extremely easy - grade boundaries are gonna be sky high.

    90/100 for an A?
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    Please tell me people just drew an octagon on the second page? I felt like an idiot
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    (Original post by FLLF)
    Were the functional groups alkene and ester?
    I put that I'm pretty confident with ester but I wasn't sure about alkene
 
 
 
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