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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 Gotzz)
    This is the only one I knew I got wrong :P
    It was either HFC's, HCFC's or hydrocarbons.
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    for radical substitution i put:
    IBr ---> I + Br

    CH4 + Br ---> CH3 + HBr
    CH4 + I ----> Ch3I + H

    CH3 + H ----> CH4

    is that wrong?
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    (Original post by bliam)
    Did anyone else notice that this time the questions were actually somewhat "helpful" with what you should write as the answers? I feel as though the longer answers had a lot of guidance
    Yeah! That's why I feel 'happy' about this exam but hopefully that doesn't mean high grade boundaries


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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.
    Yay I got that

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    I know right , hmmm.. I think I got something like that too Im worried, want atleast a B?
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    For G did people get C5H9O
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    (Original post by Gotzz)
    Biodegradable polymers, lmao. I couldn't think of anything and didn't wanna leave it blank you?
    I put Fluorinated hydrocarbons as I said before but I really don't know XD Haha nice attempt, it'd be cool if you actually got the mark for it XD
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    (Original post by yodawg321)
    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
    Im still questioning whether Anaerobic conditions will get the mark, because it said two essential conditions, when surely the reaction can happen in aerobic and anaerobic, the anaerobic bit is just a bonus... I may be wrong
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    (Original post by jacksonmeg)
    i did the exact same molecule, (didnt know what 9 carbons was called lmao)
    I wrote 2,3-dimethyloctane... it was the first that came to mind.
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    (Original post by Pataiiii)
    It was either HFC's, HCFC's or hydrocarbons.
    I put HCFCs then crossed it out as they're not biodegradable.
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    What do you guys think the grade boundaries will be like? Jan 2013 was 79 for an A and idk I think that was easier than this paper today
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    (Original post by Kenna)
    S4+ for that M/Z peak, around 80 maybe slightly less for an A. Don't like guessing grade boundaries though.
    Grrr...I wrote that and then crossed it out! Oh Why did I do that??
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    (Original post by joe1545)
    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?
    Dont you have to say because it was the only product formed?
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    (Original post by Pataiiii)
    It was 240dm cubed so it was 240/24 = 10moles then 5 x delta H which give you something in the 800's
    I think the delta H was for 2 moles of NO2 therefore 10/2(240/24) * 164 is how i did it.
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    (Original post by 6995)
    can infrared spectroscopy be used for fingerprinting ? ...
    on a daily basis?
    perhaps if you also said at airports

    by the way i dont even know if finger printing is right.- google it
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    (Original post by TheFootyKing19)
    Naming an alcohol (first few pages)
    - 3-methylpentan2-ol

    And was molecular formula of G:
    C6H12O

    Wasn't it?
    really I got 4 methylpentan 3 ol
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    Paper wasn't too bad!

    Though there seems to be some debate about the Hess' cycle question.

    I remember get -4364 or something like that
    Some people remember getting something like 4500 ( I actually remember getting this value, though calculating again and got the value above)
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    Was the absence of a catalyst for the Boltzmann distribution question and the equilibrium question earlier on? How many marks was the absence of a catalyst worth? I can't remember those questions particularly well, but I've just realised due to rushing I started writing about the addition of a catalyst, whoops.

    Overall I thought it was quite an average paper, so will hopefully will fairly average grade boundaries!


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    (Original post by motivatedshroom)
    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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    Exactly the same feeling :afraid:
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    (Original post by Gotzz)
    Biodegradable polymers, lmao. I couldn't think of anything and didn't wanna leave it blank you?
    I put 'use plant grains in plastics' the examiner is going to be judging me so bad


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