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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 kiirankapoor)
    I got that too but i wrote 95% should that be okay?


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    OH god ECF!

    I got 0.095 I knew something went wrong but then i released that i only had about 15 minutes left so i moved to the next question...

    LOST so many marks..
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    Here is an unofficial mark scheme for Q3

    3(a) Alkene and ester (2)

    (b) C=C bond present (1)

    (c) Orange/brown to colourless (1)

    (d)(i) Stereoismers have the same structural formula but different arrangement of atoms in space (1)
    (ii) I is Z-isomer, J is E-isomer (1)

    (e)(i) Enthalpy change when one mole of a substance undergoes complete combustion (2)
    (ii) 4.18 x (54.0 - 20.2) x 50 = 7.06 kJ/mol (2)
    (iii) 1.34/268 = 0.005mol (2)
    (iv) 7.064/0.005 = -1419 kJ/mol (3)
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    For IR spec question, how many marks would i get out 5 if i worked out

    *emp formula
    * molecular formula
    * gave evidence that C=O existed,
    BUT drew both structures as ketones!
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    is it correct if i wrote " Airport security check" for use of Infrared?
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    (Original post by nothepreacher)
    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.
    See!?
    I felt it was righteous!
    However, I do take the perspective of others - and in context to that very moment of examination - and think: "There is an estimate of 30,000+ candidates entered for a single examination paper sitting per season!"

    The amount of candidates who get the full UMS are around 0.05% of the total student population - around 130-ish.
    S, it wouldn't be above 80 unless I am judging wrong on behalf of the thought that the paper wasn't too verbose to distract us from answering sufficiently.


    I hope it is lower or the students like yourself!
    Maybe you have done better than you have expected too!
    This paper = WIDEST RANGE OF ANSWERS.

    The greatest of luck!



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    (Original post by walkers38)
    For IR spec question, how many marks would i get out 5 if i worked out

    *emp formula
    * molecular formula
    * gave evidence that C=O existed,
    BUT drew both structures as ketones!
    4/5 I guess? You only missed out one of the things they were looking for.
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    Did anyone else put 'POLY LACTIC ACID' for the give an another biodegradable alternative to CFCs??
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    (Original post by g.k.galloway)
    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
    Ah!
    They don't, do they?
    STUBBORN AND STRICT!
    LOL.

    Thank you ever so much, also.



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    Was anyone else drawing their cyclooctane so many times so it does not look like a circle?
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    (Original post by Fullycorporate)
    Here is an unofficial mark scheme for Q3


    3(a) Alkene and ester (2)
    (b) C=C bond present (1)
    (c) Orange/brown to colourless (1)
    (d)(i) Stereoismers have the same structural formula but different arrangement of atoms in space (1)
    (ii) I is Z-isomer, J is E-isomer (1)
    (e)Enthalpy change when one mole of a substance undergoes complete combustion (2)
    (ii) 4.18 x (54.0 - 20.2) x 50 = 7.06 kJ/mol (2)
    (iii) 1.34/268 = 0.005mol (2)
    (iv) 7.064/0.005 = 1419 kJ/mol (3)


    -1419 it was exothermic
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    Obviously if possible it would be nice if its like 95 for full UMS, could really do with getting as much UMS this year to make it easier to aim for that A* next year. From what I heard an A* in chemistry is getting 90% overall, so like 540/600 UMS in A2. But I have no idea if thats right, could someone confirm please? Thanks
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    (Original post by Annie-May)
    -1419 it was exothermic
    Yep, fixed it.
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    (Original post by Ché.)
    See!?
    I felt it was righteous!
    However, I do take the perspective of others - and in context to that very moment of examination - and think: "There is an estimate of 30,000+ candidates entered for a single examination paper sitting per season!"

    The amount of candidates who get the full UMS are around 0.05% of the total student population - around 130-ish.
    S, it wouldn't be above 80 unless I am judging wrong on behalf of the thought that the paper wasn't too verbose to distract us from answering sufficiently.


    I hope it is lower or the students like yourself!
    Maybe you have done better than you have expected too!
    This paper = WIDEST RANGE OF ANSWERS.
    The greatest of luck!



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    are you an examiner?
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    (Original post by amin666)
    is it correct if i wrote " Airport security check" for use of Infrared?
    Doesn't sound right. The millimetre wave scanners use high radio frequencies (below IR), and the controversial full body scanners use X-rays.
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    (Original post by Annie-May)
    -1419 it was exothermic
    how may marks i loose if i didn't change it to kj/mol?
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    (Original post by MelissaBlackbird)
    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)
    Its the larger value - the smaller value which give 223 i think.
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    (Original post by theCreator)
    Obviously if possible it would be nice if its like 95 for full UMS, could really do with getting as much UMS this year to make it easier to aim for that A* next year. From what I heard an A* in chemistry is getting 90% overall, so like 540/600 UMS in A2. But I have no idea if thats right, could someone confirm please? Thanks
    It is, on average!
    Actually, 94.




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    (Original post by Fullycorporate)
    Here is an unofficial mark scheme for Q3


    3(a) Alkene and ester (2)

    (b) C=C bond present (1)

    (c) Orange/brown to colourless (1)

    (d)(i) Stereoismers have the same structural formula but different arrangement of atoms in space (1)
    (ii) I is Z-isomer, J is E-isomer (1)

    (e)(i) Enthalpy change when one mole of a substance undergoes complete combustion (2)
    (ii) 4.18 x (54.0 - 20.2) x 50 = 7.06 kJ/mol (2)
    (iii) 1.34/268 = 0.005mol (2)
    (iv) 7.064/0.005 = -1419 kJ/mol (3)
    i was unsure about (e)iv)... do you put a negative sign in front because the energy is lost from the system? took about 5 mins of debating yes or no and i left it with a negative sign...
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    (Original post by Saif95)
    Was anyone else drawing their cyclooctane so many times so it does not look like a circle?
    yesssss!!!!!!! LOL
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    (Original post by Fullycorporate)
    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)
    I wrote efficient combustion for the cylic ydrocarbon, would that still be right??
 
 
 
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