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OCR Chemistry F322~ 4th June 2013~ AS Chemistry Watch

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    (Original post by FLLF)
    Could somebody help me? On this paper: http://www.ocr.org.uk/Images/58629-q...-resources.pdf
    For Q7, the mark scheme says the m/z value of the rightmost peak is 46... but it's 47 according to the graph?
    some spectrums have a tiny little peak next to the molecular ion peak - ignore it. its the bigger one thats the m+
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    (Original post by Sam_1996)
    That the small M+1 peak cause be the carbon 13 isotope.You ignore that
    (Original post by needtosucceed=))
    some spectrums have a tiny little peak next to the molecular ion peak - ignore it. its the bigger one thats the m+
    Thanks!
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    Hi guys, simple question here.
    Can we make esters with secondary alcohols? If so, any difference in naming them?
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    (Original post by Sam_1996)
    Has anyone done the specimen?
    If you have did you find the mark scheme was wrong in a few places?
    Didn't do it but in the specimens I done (F324 and F325 specimens), they were mistakes in the mark scheme so I believe you are right.
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    Halogenation, hydrogenation and hydrogen halogenation of alkenes and adding steam to alkenes are all addition reactions right? (Which ones are nucleophillic and which are electrophillic)? :/
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    (Original post by Polypocus)
    Hi guys, simple question here.
    Can we make esters with secondary alcohols? If so, any difference in naming them?
    yea you can, they wont ask you to name them though (but yea the naming is different)
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    (Original post by sladyy96)
    Halogenation, hydrogenation and hydrogen halogenation of alkenes and adding steam to alkenes are all addition reactions right? (Which ones are nucleophillic and which are electrophillic)? :/
    They are all electrophillic additon.
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    (Original post by Namod)
    Didn't do it but in the specimens I done (F324 and F325 specimens), they were mistakes in the mark scheme so I believe you are right.
    Yes I need to know this as well if it was but-2-ol and ethanol acid would we get but-2-yl ethanoate
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    (Original post by sladyy96)
    Halogenation, hydrogenation and hydrogen halogenation of alkenes and adding steam to alkenes are all addition reactions right? (Which ones are nucleophillic and which are electrophillic)? :/
    Yes they are all electrophillic additions
    Nucleophillic substitution reaction is hydrolosis
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    (Original post by needtosucceed=))
    yea you can, they wont ask you to name them though (but yea the naming is different)
    Okay thanks!
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    Do we need to explain why branching in halogenoalkanes effects their rate of hydrolysis?
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    (Original post by Loiks94)
    Yes I need to know this as well if it was but-2-ol and ethanol acid would we get but-2-yl ethanoate
    whats wrong with that?
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    Hey can anyone please help me? Im stuck on the may 23rd 2012 paper, question 2d? I don't understand how they draw that, I get the first bit of the ester, but where does the extra CH2 come from? If anyone could answer? Would appreciate it thanks
    This is what comes up in the mark scheme http://www.ocr.org.uk/Images/135164-...urces-june.pdf
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    (Original post by FLLF)
    Could somebody help me? On this paper: http://www.ocr.org.uk/Images/58629-q...-resources.pdf
    For Q7, the mark scheme says the m/z value of the rightmost peak is 46... but it's 47 according to the graph?
    In the mass spectrum there is sometimes a smaller peak after the molecular ion, it is usually obvious because it will be so tiny, it's something to do with the presence of the isotope 13 but we don't need to know about that, look for the tallest peak of the highest m/z value if that makes sense! That's why it is 46 not 47
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    (Original post by Sam_1996)
    Has anyone done the specimen?
    If you have did you find the mark scheme was wrong in a few places?
    Yeah! Think the combustion equation was wrong! Ha
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    (Original post by FLLF)
    Do we need to explain why branching in halogenoalkanes effects their rate of hydrolysis?
    yea it has come up once. you can deduce how its affected using data they give you on the rate of hydrolysis so its not something you have to necessarily memorise
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    (Original post by FLLF)
    Do we need to explain why branching in halogenoalkanes effects their rate of hydrolysis?
    i don't think so , i think we just have to know about how polarity and bond enthalpy affects the rate of hydrolysis
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    (Original post by Polypocus)
    Hi guys, simple question here.
    Can we make esters with secondary alcohols? If so, any difference in naming them?
    We just need to know for primary alcohols
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    (Original post by FLLF)
    Do we need to explain why branching in halogenoalkanes effects their rate of hydrolysis?
    Yes it was in the Jan 2011 paper
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    (Original post by needtosucceed=))
    yea it has come up once. you can deduce how its affected using data they give you on the rate of hydrolysis so its not something you have to necessarily memorise
    Is that like primary halogenalkanes hydrolyse faster than secondary and terisary?


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