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OCR Chemistry Salters B F332 10th June 2016 (Old specification) Watch

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    (Original post by KINGYusuf)
    Guys was one of the reaction mechanisms we had to draw Electrophilic Addition? With HCl or something

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    It was nucleophilic substitution l think?
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    Isn't alkene + hydrogen halide Electrophilic addition?

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    I got nucelophilic substitution too
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    But it was like ethene and HCl???

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    Guys was it Electrophilic Addition or NS?
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    I was on about the alcohol with Hcl which was nucleophilic substitution
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    I got nucleophilic substitution too but now I can hardly remember the question, wasn't the halide substituting for the OH group that came of ?
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    (Original post by smm90)
    Where has the Br come from? The question was about irradiated chlorine and methane to produce CCl4 or something..
    sorry i meant HCl

    Been revising for F334 haha
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    (Original post by _MAT_)
    Yeah they'd accept both
    Im just scared its going to be one of those really fussy OCR things that they do like not accepting peptide for amide :/
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    (Original post by KINGYusuf)
    Isn't alkene + hydrogen halide Electrophilic addition?

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    I think the exam asked to add H-Cl to Methanol, so it would have been nucleophillic substitution as the H-Cl has a permanent negative dipole which will attack the positive carbon in the methanol

    But what you said about the alkene and halogenoalkane is correct
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    (Original post by jordan_chung18)
    I think the exam asked to add H-Cl to Methanol, so it would have been nucleophillic substitution as the H-Cl has a permanent negative dipole which will attack the positive carbon in the methanol

    But what you said about the alkene and halogenoalkane is correct
    how many marks was that?
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    (Original post by mismash)
    how many marks was that?
    I think it was 3 marks so i wouldnt worry about it I found the paper quite hard overall due to the numerous GCSE questions that i hadn't done for 2 years... How'd you find it overall?
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    (Original post by jordan_chung18)
    I think the exam asked to add H-Cl to Methanol, so it would have been nucleophillic substitution as the H-Cl has a permanent negative dipole which will attack the positive carbon in the methanol

    But what you said about the alkene and halogenoalkane is correct
    i thought it was a halogenoalkane undergoing n.sub with OH-?
    i feel like ive missed so many marks
    i dont even remember if i underlined nucleophilic and substitution - like i remembering choosing them in my head but i dont remember underlining them...
    5 marks gone then
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    (Original post by jordan_chung18)
    Im just scared its going to be one of those really fussy OCR things that they do like not accepting peptide for amide :/
    Yeah but I sincerely doubt this will be one of those things, the only reason why peptide isn't accepted is because we're not taught peptide in chemistry and the technical, chemistry name is amide. Since it's just quoting stuff from an article I think they'll be fine about it.
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    (Original post by Kira Yagami)
    what did you put about infradred spectrum and how co2 can be identified?
    You had to mention that each compound have a unique fingerprint region and looking at the bond absorption if C-O is present then it tells you there is co2
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    (Original post by Doctor.Zoo)
    What did people get for the difference in density question???
    I said that Ice is less dense because when water freezes bonds get closer together leaving empty spaces so that the density of water decreases or something along those lines and you also had to talk about the formation of hydrogen bonding
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    (Original post by Bzang)
    You had to mention that each compound have a unique fingerprint region and looking at the bond absorption if C-O is present then it tells you there is co2
    I wrote about absoprotion in due to c=o bond and each bond abosrbs a specific frequency of IR .... something like that

    I was going to talk about the FP region but a question was asked about it later.
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    (Original post by AlbertoMerckx)
    few I got a little worried there, especially by the conservation of mass, How could you end up with less mass then what you started with?
    You didn't start with it and mass is also lost as energy I got 3. Something as well
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    (Original post by KINGYusuf)
    Guys was it Electrophilic Addition or NS?
    I don't think it was an Alkene input Nucleophilic sub cause I remember it had an alcohol attached to it and at the end you got methane chloride and water
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    (Original post by Kira Yagami)
    I wrote about absoprotion in due to c=o bond and each bond abosrbs a specific frequency of IR .... something like that

    I was going to talk about the FP region but a question was asked about it later.
    Yeah something like that but just so I don't loose any mark I just mentioned it
 
 
 
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