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    (Original post by Zzzyax)
    the reaction will be slow froming an ester
    why is it slow
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    (Original post by otrivine)
    glutamic acid is refluxed with excess ethanol and and concentrated h2so4 catalyst. Write an equation for this reaction


    glutamic acid is

    h2nch(ch2ch2cooh)cooh
    h2nch(ch2ch2cooh)cooh + 2ch3ch2oh --> h2nch(ch2chcooch2ch3)cooch2ch3 + 2h20 ?
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    (Original post by Zzzyax)
    tollens reagent, formed by NaOH and AgNO3 with NH3
    Good and the observation?
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    (Original post by otrivine)
    the product would be ethanoic acid and nh3+ch2ch3

    very hard
    ch3conhch3 + ch3ooh
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    (Original post by ihatepeople37)
    I will ask again.... What is the reagent and the observation that can distinguish between a ketone and an aldehyde?
    You can either use 2,4-DNP to form an orange precipitate, filter, recrystallize, melt, and compare melting points to known values, OR you can use Tollen's Reagent - forms a silver-grey precipitate/mirror if added to an aldehyde, as it is a weak oxidising agent.
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    How much do we actually have to know about GC / GC-MS?
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    (Original post by ihatepeople37)
    Good and the observation?
    SILVER MIRROR for aldehydes, no reaction for ketones

    no reaction for alcohols because it is not a strong enough oxidising agent, we actually tried to do it in a chemistry lesson in school it did not work
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    (Original post by Zzzyax)
    ch3conhch3 + ch3ooh
    how did you use your knowledge to get

    CH3CONHCH3?
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    (Original post by otrivine)
    why is it slow
    becuase phenol is such a weak acid
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    (Original post by narli)
    anyone got the january 2013 paper and markscheme please?
    I have, but idk how to attach things on here =\ you can pm your email address if you want
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    (Original post by MathsNerd1)
    h2nch(ch2ch2cooh)cooh + 2ch3ch2oh --> h2nch(ch2chcooch2ch3)cooch2ch3 + 2h20 ?
    Correct!
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    (Original post by otrivine)
    how did you use your knowledge to get

    CH3CONHCH3?
    The carboxylic acid group reacts with the amine group forming a peptide/amide link?
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    (Original post by Zaphod77)
    You can either use 2,4-DNP to form an orange precipitate, filter, recrystallize, melt, and compare melting points to known values, OR you can use Tollen's Reagent - forms a silver-grey precipitate/mirror if added to an aldehyde, as it is a weak oxidising agent.
    You absolute tank
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    Jan f324 question paper & ms
    Attached Images
  1. File Type: pdf F324_MS_Jan13.pdf (268.6 KB, 42 views)
  2. File Type: pdf F324-01Jan13.pdf (229.1 KB, 52 views)
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    (Original post by Zzzyax)
    SILVER MIRROR for aldehydes, no reaction for ketones

    no reaction for alcohols because it is not a strong enough oxidising agent, we actually tried to do it in a chemistry lesson in school it did not work
    Sick work
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    Oh yeah just to confirm, is the difference between a peptide and amide link just that a peptide link involves AMINO ACIDS ONLY whereas amide link is just reaction of COOH and NH2??
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    (Original post by otrivine)
    how did you use your knowledge to get

    CH3CONHCH3?
    CH3COO- and CH3NH2, is like forming a peptide bond, CH3COOH is like always a side product in anhydride reactions
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    (Original post by otrivine)
    Correct!
    Thanks! What's saponification?
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    (Original post by Sarangtaec)
    Oh yeah just to confirm, is the difference between a peptide and amide link just that a peptide link involves AMINO ACIDS ONLY whereas amide link is just reaction of COOH and NH2??
    Yep
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    (Original post by Zzzyax)
    CH3COO- and CH3NH2, is like forming a peptide bond, CH3COOH is like always a side product in anhydride reactions
    I see, thanks!

    do you have more ,you always give interesting questions
 
 
 
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