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

  • View Poll Results: How did you find the exam
    Hard A= 72
    42
    15.22%
    It was okay A= 76
    99
    35.87%
    Easy A= 79
    75
    27.17%
    Very Easy A=82
    60
    21.74%

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    (Original post by d.adrian)
    1:00
    Thanks my breadbin.
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    (Original post by Shaadi Baba)
    Thanks mate!
    lol what
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    (Original post by niceguy95)
    He's messing around lol
    this is a well funny convo between you guys, good luck for tomorrow
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    Can anyone tell me what catalysts go with the reactions we need to know?
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    I do not understand questions that ask to calculate percentage yield when the numbers are in tonnes?

    Please help!!
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    Predictions?


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    (Original post by S.Stanbank146)
    I do not understand questions that ask to calculate percentage yield when the numbers are in tonnes?

    Please help!!
    When they are in tonnes you do Actual/Theoretical x100
    to work in tonnes just do normal molar calculations for both compounds but when you use mass lets say its 40 tonnes just use 40x10^6 so its always in grams since moles are in gmol-1
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    (Original post by S.Stanbank146)
    I do not understand questions that ask to calculate percentage yield when the numbers are in tonnes?

    Please help!!
    It's the exact same as when you're calculating it normally, only that instead of it being in grams, it's in tonnes. 1 tonne is 106grams. That means when it says 204 tonnes, just change it into 204 x 106​ grams and you should be fine.
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    would you ever get a secondary alcohol plus a carboxylic acid to form an ester? if you can, how do you do it?
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    (Original post by freddimckinlay)
    would you ever get a secondary alcohol plus a carboxylic acid to form an ester? if you can, how do you do it?
    No, secondary alcohols always make ketones
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    (Original post by shomshomni)
    Can anyone tell me what catalysts go with the reactions we need to know?
    potassium dichromate and H+ for reflux, distil

    acid catalyst for esterification

    acid catalyst for alkene + steam

    Ni for hydrogenation

    Iron for haber process

    Can't remember any more
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    (Original post by reneetaylor)
    Thanks my breadbin.
    r0fl
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    Do we need to know nucleophillic substitution with water? Mechanism?

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    (Original post by shomshomni)
    No, secondary alcohols always make ketones
    ok thank you, so its impossible?
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    (Original post by simifeltham)
    make sure you say the the IR absorption depends on the type of bond present. also the lifetime of ghgs
    ok thanks
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    (Original post by shomshomni)
    No, secondary alcohols always make ketones
    They do, you're not oxidising the secondary alcohol, its undergoing esterification - different
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    (Original post by shomshomni)
    No, secondary alcohols always make ketones
    you're talking about oxidation of alcohols.

    Secondary alcohols can easily form esters with carboxylic acids.

    methanoic acid + propan-2-ol --> 2-propylmethanoate
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    (Original post by Jimmy20002012)
    Is it the more hydrogen bonds in the alcohol, the less volatile the alcohol?


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    Yeah, that's it..they're harder to break
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    Do we need to know exactly how a mass spectrometer works ?
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    Predictions...
    no point stating them because everything WILL come up, look at the past papers if you don't believe me
 
 
 
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