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F334 (19/06/2013 9:00AM) - Salters Chemistry (Chemistry of Materials) Revision Thread Watch

  • View Poll Results: How did you find this paper?
    Very easy (~74 for an A)
    9
    18.75%
    Easy (~71 for an A)
    11
    22.92%
    Average (~65 for an A)
    21
    43.75%
    Hard (~61 for an A)
    6
    12.50%
    Very Hard (~58 for an A)
    1
    2.08%

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    1.70 /69 for the calculation


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    (Original post by super121)
    I guessed and put neutral too

    What did people get for the 6 mark calculation?


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    i got 1.69
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    What did everyone get for that cray cray titration calculation???

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    (Original post by EstebanK0)
    I got the same unit but I got a value of 0.086

    Will I be penalised for giving an answer to 3 decimal places?
    i don't think you will because rates is normally 2sf, i think i got 0.086 too not sure though
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    Predicted grade boundaries ? Around 74/75?


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    (Original post by EstebanK0)
    I got the same unit but I got a value of 0.086

    Will I be penalised for giving an answer to 3 decimal places?
    Don't think it asked for an appropriate number of significant figures, so no


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    (Original post by manpyy)
    i got 1.69
    I got 2.7, but didn't actually know what I was doing, hopefully get method marks though


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    That paper was beaut.
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    (Original post by EstebanK0)
    I put down neutral too. Are we talking about the zwitterion question?
    I put acidic... not sure if it is the right answer, because in the question it said 'in aqueous solution' so i thought the phenol would donate a proton and the carboxylic acid would donate a proton but the amine would take a proton... so in general there is an extra proton in the solution so I said acidic.
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    1.69 (6)
    0.086 s-1 (3)
    Redox Titration:
    Fill burette with MnO4- solution
    use volumetric pipette to transfer c2o4 into conical flask
    heat to 60C and keep at 60C throughout experiment
    Stop adding Mno4 when turns permanent pink colour
    Indicator not needed because turns permanent pink colour
    End point at permanent pink colour

    Did anyone put alkaline for the zwitterion one? i dont see why the OH group of the phenol wouldn't react, as it didn't say there was only 1 mole of water of something

    Did anyone get methanol and methanoic acid

    formula of complex ion was [Fe(C2O4)3)]3-
    shape octahedral

    that's all I can remember right now
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    (Original post by aWildPidgey)
    1.69 (6)
    0.086 s-1 (3)
    Redox Titration:
    Fill burette with MnO4- solution
    use volumetric pipette to transfer c2o4 into conical flask
    heat to 60C and keep at 60C throughout experiment
    Stop adding Mno4 when turns permanent pink colour
    Indicator not needed because turns permanent pink colour
    End point at permanent pink colour

    Did anyone put alkaline for the zwitterion one? i dont see why the OH group of the phenol wouldn't react, as it didn't say there was only 1 mole of water of something

    Did anyone get methanol and methanoic acid

    formula of complex ion was [Fe(C2O4)3)]3-
    shape octahedral

    that's all I can remember right now
    Yep apart from I got methanoic acid and hcl


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    (Original post by Futuristicmedic)
    Yep apart from I got methanoic acid and hcl


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    dammmmn I knew that was wrong
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    (Original post by aWildPidgey)
    1.69 (6)
    0.086 s-1 (3)
    Redox Titration:
    Fill burette with MnO4- solution
    use volumetric pipette to transfer c2o4 into conical flask
    heat to 60C and keep at 60C throughout experiment
    Stop adding Mno4 when turns permanent pink colour
    Indicator not needed because turns permanent pink colour
    End point at permanent pink colour

    Did anyone put alkaline for the zwitterion one? i dont see why the OH group of the phenol wouldn't react, as it didn't say there was only 1 mole of water of something

    Did anyone get methanol and methanoic acid

    formula of complex ion was [Fe(C2O4)3)]3-
    shape octahedral

    that's all I can remember right now
    i agree with you on that complex question and titration question. about that methanoic acid question.... question said two acids are formed so i out methanoic acid and ethanoic acid... dont know if im right ???
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    (Original post by alansmathew)
    I put acidic... not sure if it is the right answer, because in the question it said 'in aqueous solution' so i thought the phenol would donate a proton and the carboxylic acid would donate a proton but the amine would take a proton... so in general there is an extra proton in the solution so I said acidic.
    SAMEEEEEEEEE!

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    (Original post by alansmathew)
    i agree with you on that complex question and titration question. about that methanoic acid question.... question said two acids are formed so i out methanoic acid and ethanoic acid... dont know if im right ???
    not sure, in the revision guide it gives how acidic alcohols, phenols, carboxylic acids are so i assumed that methanol can be classed as an acid?
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    (Original post by Futuristicmedic)
    Yep apart from I got methanoic acid and hcl


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    HCl ? the question said it CH3OH and CH3OH were oxidised to form two acids... I dont see how HCl is a product of the oxidation... when the two initial substance dont have Cl in them.
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    Gonna make a Poll for grade boundaries
    • Thread Starter
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    I put methanoic and erm...can't remember.
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    (Original post by aWildPidgey)
    not sure, in the revision guide it gives how acidic alcohols, phenols, carboxylic acids are so i assumed that methanol can be classed as an acid?
    Methanols are alcohols... not sure how they can be classed as acids.
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    (Original post by aWildPidgey)
    Gonna make a Poll for grade boundaries
    The invigilator said at the end that she looked through the paper and found it pretty tough.
 
 
 
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