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OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD watch

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    (Original post by Serine Soul)
    No, not unless the hydroxyl group is attached to a benzene ring (phenol)
    ohhh so if it was a phenol it would gain a Na+ aswell even if it doesn't say the NaOH was in excess?
    I saw this on a question I was doing and the extra OH was on a phenol
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    (Original post by tcameron)
    ohhh so if it was a phenol it would gain a Na+ aswell even if it doesn't say the NaOH was in excess?
    I saw this on a question I was doing and the extra OH was on a phenol
    Yeah, I think so

    What was the answer?

    And phenols are able to react with Na and NaOH, but not Na2CO3
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    (Original post by TrentAlistar)
    Its definitely gonna be that hard. In 2013 the exam board got reviewed and they complained that the chemistry exams are too predictable and there are too many people getting high marks so they are mixing it up a bit. The only papers that are gonna be any reflection of what its gonna be like this year are June 14 and 15.

    Don't panic. Look at reaction mechanisms that aren't on the specification but count as application of knowledge.Just check you understand them. If it comes up then you've already seen it and you can reel them off.
    http://www.chemguide.co.uk/mechmenu.html#top

    Look at these NMR Qs
    Particularly the hardest ones.
    https://www.tes.com/teaching-resourc...stions-6259747

    maybe mess around with spectrum simulator at http://www.nmrdb.org/ Draw in a compound and test whether you can guess the number and position of peaks of h and C13 before you look. I think it's gonna be an alkene or an amide this year(maybe even a triglyceride or an azo dye). Everything else has come up.

    Also, there are little tidbits in the book that might get examined. Like shorthand notation of fatty acids. Why substitution occurs and addition doesn't in benzene rings. Bonding in carbonyls. Basically, anything you haven't seen before is likely to come up as its last year of examination on this spec.

    Hope that helps.
    Some very good ideas suggested here !

    I also highly recommend reviewing your AS work because they will include some synoptic reactions e.g. elimination/dehydration of alcohols. Just look at a few F322 past papers.
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    (Original post by Serine Soul)
    Yeah, I think so

    What was the answer?

    And phenols are able to react with Na and NaOH, but not Na2CO3
    just to write the equation when OH- is added to a molecule which was containing an ester bond and a phenol
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    Hi does anyone have an f324 2015 attachment please I remember failing it for my mock
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    (Original post by tcameron)
    just to write the equation when OH- is added to a molecule which was containing an ester bond and a phenol
    Ah, in that case, Na+ isn't involved at all, a carboxylate ion and alcohol is formed
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    (Original post by Yellowdiamond15)
    Hi does anyone have an f324 2015 attachment please I remember failing it for my mock
    Just look on the last page
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    Last year's paper was actually hard... It had the questions I essentially failed on in my mocks lol
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    help with question C please?
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    Trying to do as much F324 as possible while trying to do well in my other exams. Panicking and crying describes it all :'(
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    (Original post by Serine Soul)
    Just look on the last page
    (Original post by Serine Soul)
    Last year's paper was actually hard... It had the questions I essentially failed on in my mocks lol
    Thank you, it was really hard especially the back page I'm normally okay with analysis questions but I left it blank
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    (Original post by Hunnybeebee)
    Trying to do as much F324 as possible while trying to do well in my other exams. Panicking and crying describes it all :'(
    pretty much me right now...
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    (Original post by tcameron)
    help with question C please?
    You want a repeating sequence with the right proportions of each monomer.
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    (Original post by tcameron)
    pretty much me right now...
    Think I've had 8 panic attacks in the last hour
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    (Original post by tcameron)
    help with question C please?
    When polymerising, H must be next to F or G because H contains two -OH groups and each of F and G contains two -COOH groups. You know that the proportion of F and G in the polymer is approximately equal, therefore your chain goes something like: -G-H-F-H-G-H-F-
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    Can someone please explain to me why substitution reactions occur in Benzene but addition reactions do not?
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    (Original post by Hyelni_x)
    Can someone please explain to me why substitution reactions occur in Benzene but addition reactions do not?
    Benzene has a pi-cloud of delocalised electrons above and below the plane (low electron density) and so cannot polarise/induce a dipole in electrophiles (in terms of electrophilic substitution)

    I think that answers it?
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    (Original post by Hunnybeebee)
    Trying to do as much F324 as possible while trying to do well in my other exams. Panicking and crying describes it all :'(
    same.. 😭


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    (Original post by marioman)
    When polymerising, H must be next to F or G because H contains two -OH groups and each of F and G contains two -COOH groups. You know that the proportion of F and G in the polymer is approximately equal, therefore your chain goes something like: -G-H-F-H-G-H-F-
    not equal, 25% f, 25% g, 50% h.

    so it's be something like -F-H-G-H- as one example.
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    Can anyone give me a model answer to explain the n+1 rule? In the NMR questions in the MS it says 'explain n+1 rule' but not sure how? I know that the no. of protons in one proton environment cause the protons to split ie CH3 will cause the CH2 next to it to become a quadruplet, but how to word it nicely?
 
 
 
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