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OCR AS - Chemistry Unit F322 - Chains, energy and resource - REVISION! watch

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    (Original post by king1234)
    overall do you think you ahve done good lol
    urm well will find out in aug
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    how was it -1279 it was +1279 for the formation question!!!!!!!!!!!! some one explain:confused:
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    (Original post by bigdaddy1234567)
    how was it -1279 it was +1279 for the formation question!!!!!!!!!!!! some one explain:confused:
    you were given enthalpy change of combustion, so you have to draw a hess cycle
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    (Original post by hatnan)
    you were given enthalpy change of combustion, so you have to draw a hess cycle
    did you have draw hess cycle
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    (Original post by gwengwen)
    for the last question I've drawn out the structure of the alcohol, carboxylic acid and the ester but I didn't put down their names... Do people think I would have lost a mark for not naming them?
    No it just sed identify them so you'll defo get the mark
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    (Original post by Dave 1994)
    No it just sed identify them so you'll defo get the mark
    do you think grade bouadnries will be lower
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    (Original post by hatnan)
    you were given enthalpy change of combustion, so you have to draw a hess cycle
    You don't need to draw a Hess's cycle... Common sense should prevail in the fact that ALL COMBUSTION REACTIONS ARE EXOTHERMIC.

    These people shouldn't even be allowed to do A-level Chemistry. It's just moronic to even ask these questions.
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    (Original post by Yarpie)
    You don't need to draw a Hess's cycle... Common sense should prevail in the fact that ALL COMBUSTION REACTIONS ARE EXOTHERMIC.

    These people shouldn't even be allowed to do A-level Chemistry. It's just moronic to even ask these questions.
    thats what i was thinking did they give us the enthalpy of combustion data or formation
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    It was definitely combustion. It asked for the definition of the enthalpy of combustion as well.
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    (Original post by Yarpie)
    It was definitely combustion. It asked for the definition of the enthalpy of combustion as well.
    im not sure becuase i think it was work out the standard enthalpy of formation from the combustion results lol
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    (Original post by Yarpie)
    It was definitely combustion. It asked for the definition of the enthalpy of combustion as well.
    how did you find the exam lol
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    You always use the data in the table. It was combustion - reactants minus products. I think it was -ve
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    (Original post by Robpattinsonxxx)
    You always use the data in the table. It was combustion - reactants minus products. I think it was -ve
    im sure it said work out the standard entahlpy of formation
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    (Original post by king1234)
    im sure it said work out the standard entahlpy of formation
    It did but it said 'using the combustion bond enthapies in the table'

    In the table there was bond enthalpies for combustion. You always do R-P.
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    (Original post by Robpattinsonxxx)
    It did but it said 'using the combustion bond enthapies in the table'

    In the table there was bond enthalpies for combustion. You always do R-P.
    for 10 marks for that mechanism question how can you get 10 marks lol dont mind me asking
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    (Original post by barzy_j)
    It actually kills me to read this. Where was I and how did I not write this? All I managed to write was increased pressure causes an increase in rate of reaction, I don't think I explained. As for the composition one, I said the temp and concentration or whatever was unchanged so composition stayed the same. 5/4 silly, pathetic marks gone. Argh!
    same i got first part lol but not the second part of question now i understand takes the piss lol:
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    Is there an unofficial mark scheme?
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    Let this thread die
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    (Original post by king1234)
    for 10 marks for that mechanism question how can you get 10 marks lol dont mind me asking

    Which mechanism. The halogenoalkanes?
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    (Original post by Robpattinsonxxx)
    Which mechanism. The halogenoalkanes?
    yes
 
 
 
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