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    (Original post by Leeki)
    Guys! This is for edexcel unit 1 paper that was sat yesterday.... Urm there was a question where you had to work out the mass of something given that 250 Cm^3 of hcl? (I think) and the temp was 50 degree ?? Can't remmeber something like that and I got 14g isn't that too much??
    (Original post by JustAGuyy)
    Just out of interest,

    For anyone who did the Edexcel AA chemistry paper on Friday, for the 'how much solid is needed to raise the temperature of 250 cm3 of water by 15? Degrees, did anyone get 11.4g or 11. Something?
    Looking in here, no one has!
    It was worth 3 marks so some of the explanations on here seem a bit straight forward for 3 marks!

    Thanks!
    7.45g for sure

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    Any peeps here doing ccea as section B on wednesday?
    Im struggling to write notes on the organic techniques as i dont know how much detail is required!
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    For oxidation of alcohols, do you have to say both K2Cr2O7 AND H2SO4?

    OCR A

    Thanks
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    (Original post by chuckster111)
    For oxidation of alcohols, do you have to say both K2Cr2O7 AND H2SO4?

    OCR A

    Thanks
    Yes

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    (Original post by pauux)
    Is there a thread for the OCR Chemistry F322 exam?? I can't find it
    Yep, just follow the link
    http://www.thestudentroom.co.uk/show....php?t=3351409
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    Thankss
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    Can someone explain why alkenes are more reactive than alkanes. Is it because of the pi bond. Can someone explain the pi bond bit to me. Thanks
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    (Original post by Super199)
    Can someone explain why alkenes are more reactive than alkanes. Is it because of the pi bond. Can someone explain the pi bond bit to me. Thanks
    The double bond has a high electron density and is susceptible to electrophilic attack

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    (Original post by C0balt)
    The double bond has a high electron density and is susceptible to electrophilic attack

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    Did you ever read the official edexcel reason why pi is weaker? Made me laugh lol

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    (Original post by samb1234)
    Did you ever read the official edexcel reason why pi is weaker? Made me laugh lol

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    In the book? I never open it lol It's collecting dust
    Well i saw mark scheme saying not much overlap which is..:dontknow:

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    (Original post by C0balt)
    The double bond has a high electron density and is susceptible to electrophilic attack

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    ah thought so . What about the sigma bond - anything I have to know about that.
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    (Original post by Kitty201322)
    I have nine days to revise unit two for bio and chem D: just great and hoefully it does push it up I hope grade boundaries are low x
    I have 9 days to revise unit 2 law chemistry and biology :'((( x
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    (Original post by C0balt)
    In the book? I never open it lol It's collecting dust
    Well i saw mark scheme saying not much overlap which is..:dontknow:

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    Yeah it was something like that. Best ms answer was when they felt the need to put 'allow the number 4 to be drawn either way' in the notes lol

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    (Original post by samb1234)
    Yeah it was something like that. Best ms answer was when they felt the need to put 'allow the number 4 to be drawn either way' in the notes lol

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    Well this made me laugh

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    (Original post by C0balt)
    Well this made me laugh

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    Hahahah fs
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    (Original post by C0balt)
    Well this made me laugh

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    Haha. Do they really feel the need to tell the marker to accept misspellings like surely that is obvious

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    (Original post by samb1234)
    Haha. Do they really feel the need to tell the marker to accept misspellings like surely that is obvious

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    And I wonder how common "sunshine yello percipitate" was to make it get onto the public mark scheme

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    Can someone explain to me what the difference is between positional and functional group isomers? I'm finding it hard to understand it properly from the book.


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    (Original post by meloj)
    Can someone explain to me what the difference is between positional and functional group isomers? I'm finding it hard to understand it properly from the book.


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    Positional - one or more atoms are in a different place eg 2-bromoheptane and 4-bromoheptane the bromine is attached to a different carbon.

    Functional group - same atoms but in different functional groups eg you might have propanal and propanone both of which have exactly the same atoms but different functional groups

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    If you have CH2F2 and are asked to draw the partial charges, what do you do with the hydrogen atoms since they're less electronegative than carbon?
 
 
 
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