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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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    If only this was my last exam, it would have ended on a fairly nice note .
    But god damn Physics tomorrow :mad:
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    14
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    Since temp is varied in textbooks regarding fermentation

    Was mentioning yeast enzyme and anaerobic conditions all 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 ??
    All same apart from the last one I did a further I radical and CH3 radical


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    (Original post by sohailkm96)
    I thought it was quite easy, only one question I didn't get at all and it was a 1 marker:

    State a biodegradable CFC (or something along those lines): I put Fluorinated hydrocarbons (cause the C-F bond can't break in UV light) but I'm really not sure? Anyone know?
    This is the only one I knew I got wrong :P
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    (Original post by kingmango)
    I swear I got like +820 for the 24dm3 question? Anyone else get that?
    I did


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    can infrared spectroscopy be used for fingerprinting ? ...
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    (Original post by MsAqa12345)
    What do you think the grade boundary for an A is guys??
    I Made SUCH stupid mistakes!
    What did you guys get for the molecular formula for m/z peak 128?? I was so confused?
    S4+ for that M/Z peak, around 80 maybe slightly less for an A. Don't like guessing grade boundaries though.
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    (Original post by MsAqa12345)
    What do you think the grade boundary for an A is guys??
    I Made SUCH stupid mistakes!
    What did you guys get for the molecular formula for m/z peak 128?? I was so confused?
    Yeah me too D: I messed up on the IR, enthalpy/Ea questions and the drawing of the mechanisms and 4 boxes one
    I'll be lucky to get a C at this rate

    And for the m/z peak I got
    256
    and S8 and S4

    or something like that
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    (Original post by yasmin.mahfouz)
    I did


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    In my working out I got 820, but I think i put a wrong number on the answer line, will i lose the marks??
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    (Original post by bliam)
    What would happen if you literally put "yeast present"
    I'm not sure, maybe you needed to mention that yeast acts as the catalyst
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    (Original post by BeckiFlute(:)
    Since when was CO2 not a colourless gas but CO was..?! If it had completely combusted, there would have been no smoke. I'm pretty sure it was due to unoxidised reactants being released as gas?
    For that question, I wrote that the compound didn't combust properly because it has a very long chain.
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    (Original post by Gotzz)
    This is the only one I knew I got wrong :P
    Yeah same everything else I'm pretty sure I didn't do that bad on, it was an easy paper in general I thought. What did you put for that question??
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    (Original post by bliam)
    Wait, wait, I'm confused on this question.

    I put:

    Initiation: IBr -> I∙ + Br∙
    Prop1: CH4 + Br∙ -> CH3∙+ HBr
    Prop2: CH3∙+ I2-> CH3I + I∙
    Termination/Overall (Can't remember): CH4 + IBr -> HBr + CH3I

    (I hope)


    I'm not sure but i put:

    IBr --> I + Br

    Prop1: CH4 + Br --> Ch3 + HBr
    2) CH3 + IBr --> CH3I + Br
    Termination --> Br +Br ---> Br2

    and the bond fission etc stuff.
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    (Original post by bliam)
    I said that it was a yellow flame due to incomplete combustion, and the black smoke was to soot being produced

    Oh well, I only need to get a C in it
    You're right

    (Original post by Gotzz)
    Correct name, but for molecular formula I got C5H10O, I checked like twice.
    I got near that haha, C5H9O...
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    I'm so scared about physics tomorrow! Mechanics was great but I have an awful feeling this exam's going to be terrible


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    Glucose question I think the answers for the conditions were

    - 25 to 37 temp
    - Yeast Catalyst (Zymase)
    - Anerobic respiration

    There might be more this is normally the common ones
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    (Original post by sohailkm96)
    Yeah same everything else I'm pretty sure I didn't do that bad on, it was an easy paper in general I thought. What did you put for that question??
    Biodegradable polymers, lmao. I couldn't think of anything and didn't wanna leave it blank you?
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    With the question where it was why does the reaction have 100% atom economy, even though it didnt as Hydrogen was being produced what did people say? I said because hydrogen is also a desired product as it can be sold on or used in process such as the hydrogenation of an Alkene, an example is the manufacture of margarine... Anyone?
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    (Original post by nelemauddin)
    I'm not sure but i put:

    IBr --> I + Br

    Prop1: CH4 + Br --> Ch3 + HBr
    2) CH3 + IBr --> CH3I + Br
    Termination --> Br +Br ---> Br2

    and the bond fission etc stuff.
    Same
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    (Original post by yasmin.mahfouz)
    All same apart from the last one I did a further I radical and CH3 radical


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    I put the termination as "CH4+ IBr -> CH3I + HBr"
 
 
 
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