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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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    HFC'S anyone?
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    What were the two functional groups? Ester and alkene?
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    What is an alternatice for CFCs i put HFCs but it said biodegradeable...


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    i put HCFCs
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    I messed up the IR spec structure so bad, only got the empirical formula and peaks but it was only 5 marks instead of the 10 it usually is so I'm happy about that


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    (Original post by massi1296)
    i put HCFCs
    are they biodegradeable?


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    What was the Enthalpy change for the rocket fuel?
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    -4596 for enthalpy change
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    (Original post by kiirankapoor)
    are they biodegradeable?


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    in the book it says hfcs or hcfcs are used as an alternative so i think so
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    what did everyone get for the percentage yeild one?? and how did you work it out cos im pretty I messed that up
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    95.5% Percentage yield
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    Am I the only person who didn't have time to finish? The frustrating thing is that I knew how to do the remaining questions
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    (Original post by massi1296)
    in the book it says hfcs or hcfcs are used as an alternative so i think so
    According to google, HCFCs is right. Not too sure about HFCs


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    (Original post by flimbys104)
    95.5% Percentage yield
    I got that too but i wrote 95% should that be okay?


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    (Original post by bunny96)
    Am I the only person who didn't have time to finish? The frustrating thing is that I knew how to do the remaining questions
    I didn't finish in time I did all the long questions though
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    (Original post by purpleshadows)
    what did everyone get for the percentage yeild one?? and how did you work it out cos im pretty I messed that up
    I got 95% or something like that. Mol of the desired product over Mol of reactant which came out at (210/220)x100
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    Depends if you have the full answer in your working out for the 95.5%
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    (Original post by bunny96)
    Am I the only person who didn't have time to finish? The frustrating thing is that I knew how to do the remaining questions
    I finished with 20 mins to spare. I thought it was a really nice paper

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    (Original post by kiirankapoor)
    According to google, HCFCs is right. Not too sure about HFCs


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    if hcfc is then HFCs will be right
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    (Original post by flimbys104)
    -4596 for enthalpy change
    Could you explain how you got that ?


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