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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 wndms)
    For mass spec I wrote "Analysing a person's breath".. do you think its acceptable?

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    That's the funniest description ever. :ahee: But I don't see why not.
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    (Original post by walkers38)
    Please teach me how to merge different pdf files in one? I have been wanting to know this all my life?????
    There are quite a few ways to do this. The easiest method is to use this website: http://foxyutils.com/mergepdf/ or to install a virtual .pdf printer.
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    Having looked through this thread, here is an unofficial mark scheme for Q1:


    1(a)(i) C10H22 (1)
    (ii) Any branched isomer of C10H22 (i.e) 2-methylnonane or 2,3-dimethyloctane plus skeletal formula (2)
    (iii) Branched chain has less surface contact - less vdWs' forces etc (2)

    (b)(i) Any equation to show cracking of C15H32 (i.e C15H32 -> C10H22 + C5H10) (1)
    (ii) C-C bond can break anywhere (1)
    (c)(i) Cyclic octane - (i.e an octagon) (1)
    (ii) Cyclic hydrocarbons burn more efficiently (1)
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    (Original post by SinghSTAR)
    My teacher told me that the largest number of C atoms you can get in an alkane ring is 6, so wouldn't the skeletal formula of Octane be a hexagon with two methyl groups extending from it?

    I remember it being discussed not so long ago.

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    http://en.wikipedia.org/wiki/Cyclooctane

    Your teacher talks **** =D
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    (Original post by g.k.galloway)
    ummmm, I thought cis trans related to something to do with masses...I'm not sure if it was applicable to the molecule or not?
    But if it is (I don't know much about it) and Z=Cis, E=trans then yes
    Thanks
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    Any predictions on full UMS grade boundary ?

    Realistically i managed to get around 93/94 marks - Hope that's enough *fingers crossed*
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    ‒4596 or ‒4956 something like that
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    (Original post by irfymahmood)
    what equation did you use, did u use hess law or the formation equation?

    Products - Reactants. Formation
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    (Original post by walkers38)
    ‒4596 or ‒4956 something like that
    i got -4596 working it out just now, presuming i did it the same way in the exam lol.
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    (Original post by ThatScienceGuy)
    Any predictions on full UMS grade boundary ?

    Realistically i managed to get around 93/94 marks - Hope that's enough *fingers crossed*
    I've seen it at 97 quite a few times...so we'll need some epic finger crossing! (I think I got about 95/96 ish)
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    (Original post by nothepreacher)
    too low It would be 84 for an A I supoose
    What do you mean too low?
    LOL.

    I personally feel that I scored 98/100 which those two mistakes on small marked question, but I still feel that it was a challenging paper comparing it in between different students!

    Did you think you done great?
    It was a matter me going through thinking: "This is the type of question that people might wreck!"
    Now?
    I have read the Examiners reports and they inform us a lot on what she should get right to make it into the top boundary of performance!

    I hope you done extraordinary, anyway.
    Yu guys are ALL awesomely motivated, focused and intelligent!






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    (Original post by nothepreacher)
    too low It would be 84 for an A I supoose
    Why?!! That's too high
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    Thumbs up if you want me to do the paper and upload it?
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    (Original post by g.k.galloway)
    I've seen it at 97 quite a few times...so we'll need some epic finger crossing! (I think I got about 95/96 ish)
    It is normally 94/100.


    By the looks of it, it seems you and I - now thinking about it - has full UMS from our predictions!
    Congratulations and huge well done!



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    (Original post by nothepreacher)
    I got 87+-2 Do you think that would definitely be an A?
    Thats bit high an A in january 2013 was 79?
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    (Original post by Saif95)
    Why?!! That's too high
    That's what I thought!
    LOL.



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    (Original post by Ché.)
    What do you mean too low?
    LOL.

    I personally feel that I scored 98/100 which those two mistakes on small marked question, but I still feel that it was a challenging paper comparing it in between different students!

    Did you think you done great?
    It was a matter me going through thinking: "This is the type of question that people might wreck!"
    Now?
    I have read the Examiners reports and they inform us a lot on what she should get right to make it into the top boundary of performance!

    I hope you done extraordinary, anyway.
    Yu guys are ALL awesomely motivated, focused and intelligent!






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    I'm one of those weak students dreading it to be that high for an A considering how many people on here said they found this a pice of cake.
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    (Original post by walkers38)
    Thumbs up if you want me to do the paper and upload it?
    Yes please
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    (Original post by Ché.)
    It is normally 94/100.


    By the looks of it, it seems you and I - now thinking about it - has full UMS from our predictions!
    Congratulations and huge well done!



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    Hopefully...I might have got something else wrong, will have to see - fingers crossed though!

    I wish I knew what I got in my ISAs though (our school doesn't tell us)

    Well done to you
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    is there a mark scheme?
 
 
 
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