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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 AqsaMx)
    Attachment 538295

    Can anyone explain why CH3CH2COCl hydrolysed more readily than CH3CH2CH2Cl??
    CH3CH2COCl has a carbonyl group, so the electronegative oxygen atom draws carbon's electrons away from it. This means that the carbocation of CH2CH2CH2Cl is less positive than that of CH3CH2COCl, therefore it is less attractive to nucleophiles, such as the oxygen atom of water in hydrolysis.

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    anyone know anything about converting things to molar mass in titrations? panicking about the f321 retake tomorrow and want to ensure I covered every thing
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    (Original post by AqsaMx)
    Can someone explain why the reaction between phenol and Na is classed as a redox/reduction reduction, is it become the Carbon oxidation number decreases??
    It's redox because sodium loses an electron (and is oxidised) and the proton of the OH group of phenol gains an electron and is reduced to hydrogen.
    2CH6H5OH +2Na > 2CH6H5O-Na+ + H2

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    Can anyone explain y u would multiply the concentration by 100?? In the last question
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    (Original post by pineneedles)
    The water isn't used to produce the ester. 0.54 moles of the ester are produced, so an additional 0.54 moles of water are produced in the reaction, bringing the total amount of water in the equilibrium mixture up to 5.54 moles

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    Oh I see, what's the water used for then?
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    Thread for retakes:
    http://www.thestudentroom.co.uk/show....php?t=4069237
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    (Original post by AqsaMx)
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    Can anyone explain y u would multiply the concentration by 100?? In the last question
    What was the answer to the last question?
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    (Original post by AqsaMx)
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    Can anyone explain y u would multiply the concentration by 100?? In the last question
    It was diluted in a solution 100 times its volume. Which means it's concentration reduced by 100 times


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    How was f321 chaps?

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    (Original post by zirak46)
    How was f321 chaps?

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    Thought I did well and turns out I made lots of silly mistakes. Really kicking myself for it

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    (Original post by Hunnybeebee)
    Thought I did well and turns out I made lots of silly mistakes. Really kicking myself for it

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    This is how I feel as well.

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    Got any hard questions or anything to be explained? I need to do some work for chem
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    (Original post by marioman)
    Not sure if these have been posted yet.

    June 2015 F321: Paper | Mark Scheme
    June 2015 F322: Paper | Mark Scheme
    June 2015 F324: Paper | Mark Scheme
    June 2015 F325: Paper | Mark Scheme
    You deserve all the reps sir! thank you so much!
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    (Original post by Serine Soul)
    Got any hard questions or anything to be explained? I need to do some work for chem
    F325 January 2013, last question is a fun one.
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    Found out today I got 38/60 :/ that Mr polymer Q and NMR Q are soooo hard
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    (Original post by marioman)
    F325 January 2013, last question is a fun one.
    Water of crystallisation? I've done that over 5 times to make sure I get it :lol:
    (Original post by itsConnor_)
    Found out today I got 38/60 :/ that Mr polymer Q and NMR Q are soooo hard
    I did that for a mini mock a couple of months and got like two marks out of 7
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    On Q3ci June 2012 it gives you the structure of oxandrolone and asks you to name its functional groups. I wrote ester and hydroxyl groups but it says in MS that answer is alcohol and hydroxyl is wrong. Can anyone tell me why this is? I'd always thought hydroxyl functional group and alcohol functional group were the same.
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    (Original post by science24601)
    On Q3ci June 2012 it gives you the structure of oxandrolone and asks you to name its functional groups. I wrote ester and hydroxyl groups but it says in MS that answer is alcohol and hydroxyl is wrong. Can anyone tell me why this is? I'd always thought hydroxyl functional group and alcohol functional group were the same.
    The mark scheme says "ignore" which doesn't mean that it's wrong - it's just not what they wanted. I assume they wanted 'alcohol' to differentiate it from phenol but I'm not 100% sure.
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    (Original post by marioman)
    The mark scheme says "ignore" which doesn't mean that it's wrong - it's just not what they wanted. I assume they wanted 'alcohol' to differentiate it from phenol but I'm not 100% sure.
    Okay, I see. It's definitely not a phenol though. This is the structure:
    https://www.google.co.uk/search?q=wh...lone+structure
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    Anyone have any tips for revision and for the exam to get the highest marks? I revise and do past papers etc but I'm constantly being caught out by ocr on silly questions and the the lost marks do add up

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