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

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    Hard A= 72
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    Easy A= 79
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    Do we need to know what happens in kyoto and montreal protocal???? If so what happens?? Thanks
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    Hi,


    -CH2CH2CH=CHCH2CH2-


    What would be the Z isomer of this ?

    No Idea
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    Can someone pleeeeeeeeeease explain to me how to identify structural Isomers from Mass Spectrometry, Like how do you know which fragment peaks to take and than what do you do with them.

    I will seriously love you forever if someone does thankyouuuu
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    (Original post by ray96)
    Hi,


    -CH2CH2CH=CHCH2CH2-


    What would be the Z isomer of this ?

    No Idea
    Maybe this? Excuse my terrible paint drawing
    Attached Images
     
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    What do we have to know about the protocols
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    (Original post by ApplePearOrange5297)
    Can someone pleeeeeeeeeease explain to me how to identify structural Isomers from Mass Spectrometry, Like how do you know which fragment peaks to take and than what do you do with them.

    I will seriously love you forever if someone does thankyouuuu
    The peaks show you ions, for example a peak at 29 would be CH3CH2+. There may then be another peak at 43 which would be CH3CH2CH2+. There's no calculation to find out what it is you just have to guess by adding different masses. However they usually use 15 (CH3+) , 29 and 43 for a hydrocarbon. The very last peak shows the mr of the whole thing, however if there is a tiny tiny peak after it, ignore the tiny peak. Refer to this image for help about this
    Name:  mplus1peak.GIF
Views: 162
Size:  2.2 KB

    In the screenshot the m+ peak would be the mr of the final product.

    So for example a m+ peak at 58 would be CH3CH2CH2CH3 which is butane.
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    What do we have to know about the protocols
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    (Original post by Felttip)
    What do we have to know about the protocols
    Nothing really. Justfor example if we get 4/5 marker on green chemistry, just say:

    - counties can develop protocols etc

    And maybe:
    - Kyoto protocol = increased use of renewable energy by 5% by 2012
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    (Original post by theo3335796)
    Maybe this? Excuse my terrible paint drawing
    Yup. That's right!
    • Thread Starter
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    Say you know the molecular formula of a compound and get given the mass spectrum of it, and the is a fragmentation peak, would it just be a case of trial and error to work it out?


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    (Original post by niceguy95)
    Carbon capture storage consists of 2 stages

    Co2 is injected deep into the ocean

    It react with metal oxides to form stable carbonates

    Regarding This topic, it is what scientists do to reduce global warming

    Other methods include providing scientifical evidence global warming is occurring to the government

    Also following the Kyoto protocol
    Btw, they're not two stages of CCS, they're just two types.
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    (Original post by theo3335796)
    The peaks show you ions, for example a peak at 29 would be CH3CH2+. There may then be another peak at 43 which would be CH3CH2CH2+. There's no calculation to find out what it is you just have to guess by adding different masses. However they usually use 15 (CH3+) , 29 and 43 for a hydrocarbon. The very last peak shows the mr of the whole thing, however if there is a tiny tiny peak after it, ignore the tiny peak. Refer to this image for help about this
    Name:  mplus1peak.GIF
Views: 162
Size:  2.2 KB

    In the screenshot the m+ peak would be the mr of the final product.

    So for example a m+ peak at 58 would be CH3CH2CH2CH3 which is butane.
    Ahhh Thank you

    But how would you identify an isomer from the ion peaks? Like this question how do you know from the m/z 29 value, the isomer is butane and not 2methylpropane.Name:  image (17).jpg
Views: 295
Size:  501.0 KB
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    (Original post by needtosucceed=))
    did u do f325 in january? we did it as a mock in class and it was killer! same ive got 2 on tuesday :/ are u aiming for an A overall?
    i did in january. it was the worst ever score i have gotten in an exam.horrendus.
    did u do it?
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    an someone explain why only two isomers can be formed in Question 4B(iii) - i do not get why only two isomers and not more ? thank you. It the june 2010 paper

    http://www.ocr.org.uk/Images/65130-q...-resources.pdf
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    june 2010 paper question 4b iii so confused why only two isomers are formed and not more ?
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    (Original post by motivatedshroom)
    Thanks for setting up the forum! I just scraped an A on f321 exam with 72/90 UMS points. Very happy it's an A but I wish I scored more UMS points.

    Does anyone know the definitions for:
    -E/Z isomerism.
    -Cis/trans isomerism.

    Also I'd be really grateful if someone could please explain the difference. I'm a bit confused. Thanks.
    I missed an A by 2 ums I got 70
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    (Original post by ssflcb)
    june 2010 paper question 4b iii so confused why only two isomers are formed and not more ?
    theres no other isomers you can draw..theyre the only 2 possible
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    (Original post by scorpio22)
    i did in january. it was the worst ever score i have gotten in an exam.horrendus.
    did u do it?
    nope I did f324 in january, we did the january paper for f325 as a mock in class. Hoping this junes paper should be a lot better considering how bad januarys was
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    Is it still possible for me to get an A? I got a high B in unit 1 and a C in all coursework, but I'm retaking F325, F322, and F324
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    (Original post by ApplePearOrange5297)
    Ahhh Thank you

    But how would you identify an isomer from the ion peaks? Like this question how do you know from the m/z 29 value, the isomer is butane and not 2methylpropane.Name:  image (17).jpg
Views: 295
Size:  501.0 KB
    If it was 2 methyl propane you wouldn't get peaks at 15, 29 and 43.
    It would be CH3CHCH3CH3 ( 2 methyl propane ) which does not support the absorption's.

    For example you may get CH3CHCH2+ which is 42, which is not one of the peaks.

    you just have to break it down and look at the individual ions as to what it could be.
 
 
 
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