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    (Original post by MasterYi)
    Dam, I can't find the paper. Are you sure it is what you said it is.
    iTS the Jan 2009

    here

    http://www.ocr.org.uk/qualifications...y-a-h034-h434/
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    How would you define addition polymerization in the exam?
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    (Original post by k54g00)
    Any predictions as to what might come up tomorrow?
    Look literally about 4 posts up, mate!
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    (Original post by thers)
    How would you define addition polymerization in the exam?
    Joining two molecules via. the breaking of a double bond?
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    How do we use fragmentation patterns on the mass spectrum to identify fragment ions? Should we memorise some of the ones like CH3+=15 or something?
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    (Original post by MathsNerd1)
    Couldn't you have electrophilic substitution and what am electrophile? also the HDL and LDL and saturated hydrocarbon and such? Also there will be mobile phase and stationary phase and chemical shift?
    pretty sure LDL and HDL isn't in our specification.
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    The reason why the answer has the CH(CH3)2 attached to the oxygen instead of the carbon is because:
    • The peak at Delta=4 for the 1 hydrogen is attached to a HC-O group
    • If that peak was between delta2-3 then your structure may be correct.
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    (Original post by mrmccarl)
    pretty sure LDL and HDL isn't in our specification.
    It is not but you need to describe how are trans fats 'bad' to our body and increase in LDL is one of the answer
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    (Original post by mrmccarl)
    pretty sure LDL and HDL isn't in our specification.
    They're in the book and HDL is responsible for removing the cholesterol from the body wheras LDL's deposit cholesterol on the walls of arteries.
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    (Original post by MasterYi)
    The reason why the answer has the CH(CH3)2 attached to the oxygen instead of the carbon is because:
    • The peak at Delta=4 for the 1 hydrogen is attached to a HC-O group
    • If that peak was between delta2-3 then your structure may be correct.
    did u look at the chemical shifts?

    but how can you use the chemical shift to know which stuff goes where
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    (Original post by AFC_123456789)
    ahh makes sense, thank you. So if you have ch3ch2cho what is the splitting pattern there? Thanks so much
    The first H's on the CH3 would have a splitting pattern on 3. This is because there are 2 H's on the adjacent carbon so n=2 and therefore n + 1 = 3.
    The H's on the CH2 would have a splitting pattern on 4. This is because the carbon to the left has 3 H's bound to it and the carbon to the right has no H's directly bound to it. Therefore n=3 and therefore n +1 = 4.
    The final H on CHO would have a splitting patten of 3. This is because the adjacent carbon is CH2. Therefore n=2 and therefore n + 1 = 3.
    Hope this helps you understand it more!
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    Does anyone else feel quite relaxed for this exam when they know absolutely nothing but need a top mark to get an A? For some reason there is no urgency in me today
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    (Original post by MathsNerd1)
    Does anyone else feel quite relaxed for this exam when they know absolutely nothing but need a top mark to get an A? For some reason there is no urgency in me today
    LOL me too
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    When you're reducing using NaBH4 do you have any other condition required such as heat/reflux?
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    (Original post by LosMutos)
    LOL me too
    Tomorrow will be fun for us Anyone got some questions for me? I need some practice
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    (Original post by otrivine)
    did u look at the chemical shifts?

    but how can you use the chemical shift to know which stuff goes where
    Woah. Do you have the full question with the peaks and everything? Do yu have a data sheet?

    You are supposed to know this right?

    "but how can you use the chemical shift to know which stuff goes where"
    If you don't know then how did you come up with that strucutre of yours.
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    (Original post by chiny94)
    When you're reducing using NaBH4 do you have any other condition required such as heat/reflux?
    Warm and aqueous
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    (Original post by thers)
    Warm and aqueous
    Okay cool thank you
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    (Original post by MasterYi)
    Woah. Do you have the full question with the peaks and everything? Do yu have a data sheet?

    You are supposed to know this right?

    "but how can you use the chemical shift to know which stuff goes where"
    If you don't know then how did you come up with that strucutre of yours.
    No I mean, I understand i use the chemical shift to identify the type of proton environment but how would I know which side to put them like I got the correct structure but my benzene ring is in a different place
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    (Original post by MathsNerd1)
    Tomorrow will be fun for us Anyone got some questions for me? I need some practice
    Write an equation for the nitration of benzene
    Hence calculate the atom economy for the formation of nitrobenzene. [3]
 
 
 
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