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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 344302)
    Is breathalyser a use of infrared spec,


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    Yes
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    (Original post by melissablackbird)
    guy, you know the question where we had to draw the products after oxidising, making an ester and dehydration. Would i loose a mark for not including water in the dehydration? Or would it be ok just putting the alkene?
    thats fine
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    what was the activation energy for reverse reaction please
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    (Original post by nothepreacher)
    Can I get an A* in chemistry with an overall B at AS?
    You need minimum 480 UMS overall for the A, and on top of that 90% across all A2 units
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    Someone make a mark scheme.
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    If I put to catch drunk drivers (stupid way of putting it) for uses of IR would it be right?
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    (Original post by 344302)
    That's still an A isn't it?? Grade boundary won't be higher than 81/82 because it's June paper and a lot of weaker candidates sit it


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    got a 27/40 on the coursework so i am kinda stuffed really
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    (Original post by such)
    Yes
    Phew!!


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    (Original post by Liberty.)
    What if you wanted just an A overall and got a B in AS? Would you just need high A's, like 85%?
    yes
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    (Original post by Alotties)
    Yep you could.
    You just need to get over 90% at A2.
    B is 70%, A* is 90%, that adds up to 80% overall and 90% at A* which is what you need for an A*.
    You could get a C at AS and 100% at A2 and still get an A*.
    Sorry that's wrong. You need AT LEAST A at AS then 90% average across the A2 units
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    for definition of homologous series, would a group of molecules with same function group each differing by CH2 be worth 1 or 2 marks
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    (Original post by kelvinbeyioku)
    got a 27/40 on the coursework so i am kinda stuffed really
    What do you think will be an A for the coursework? I got 35/40 and I'm still worrying.
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    (Original post by Loiks94)
    Someone make a mark scheme.

    I am
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    Thank you!!


    Think i lost about 16 marks oops
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    for the radical substitution 7 marker... did anyone else only write about 7/8 lines and leave most of the page blank? i checked through it about 5 times and was sure i'd covered all of the bullet points... this paper seems to have gone really well but i don't know if that's just me not putting enough detail and cutting corners unintentionally....
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    (Original post by Deziah)
    For the flow chart one;
    I got a ketone in the top left box, ester in the top right, and two alkenes in the bottom two boxes. I think they all produce water when they react? So I put +H20 in every box just in case, hopefully they'll ignore that. :-)
    I put H2o in every box too!
    If they mark all my answers wrong for that it will be incredibly harsh!
    I can imagine I'd lose one mark for it though maybe!
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    (Original post by joshyewen)
    I think in the last question about the bolztman distribution. when talking about temperature i also wrote about your point about more successful collisions but also you should draw on your curve the extra proportion of molecules with greater than the activation energy i think haha
    how can you remember most of your answers like even without the paper. I can barely remember mine especially the ones with numeric answers
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    (Original post by nothepreacher)
    Can I get an A* in chemistry with an overall B at AS?
    Yes. You've got to get >480 ums in the whole a level (ie. an A grade) and you've got to get >270 in the AS units...so yes, you could get an A* with a B at AS.
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    (Original post by Liberty.)
    What do you think will be an A for the coursework? I got 35/40 and I'm still worrying.
    Well!?
    You've made in the A grade boundary - as far as the boundaries tell us - by one raw mark OR two UMS.

    You'll be awarded 50/60 for your F323 module.



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    (Original post by LanadelreyHey)
    what was the activation energy for reverse reaction please
    It was the enthalpy of the reaction + the activation energy for forward reaction. 611 if I remember correctly (I'm pretty sure that's right)
 
 
 
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