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    Can anyone help me?
    Enthalpy of solution. How low does the positive value have to be for it to count as a 'may' dissolve? :| up to 10kj or lower? :/
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    (Original post by Boompw)
    What are the main topics we really even need from chemical storylines? I read and its just a load of waffle
    Nothing ... If you have cgp revision guide then only use that, forget storylines. If you do not, its generally not important.

    Just make sure you understand the chemistry behind stuff, and you should be ok in the exam.
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    Is 82 out 120 on the specimen paper a decent enough score if looking at A grade people?!?!?! Not sure!
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    (Original post by Adam9)
    I did the 2011 january f335 past paper, and I did good on it from cgp alone .... You needed 80/120 for an A, and I got 99/120.

    However, you may be right if you are referring to the june 2010 paper, coz I have not seen that yet, so it might have a lot of storylines.

    I advise you, however, to ignore your teacher because this is only the third f335 exam since they changed the syllabus in 2009, so they will not be running out of things to ask for just yet, if ever.

    Good luck tomorrow
    Thank you, i'll probably just read storylines vaguely and not stress to much about it - I have the CGP guide somewhere but I've been revising mainly from CI and the revision guide. Do you think the CGP book is better at explaining things than the revision guide?

    Thank you and good luck to you
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    (Original post by Ro27)
    Is 82 out 120 on the specimen paper a decent enough score if looking at A grade people?!?!?! Not sure!
    Have not done the specimen paper, but generally, specimen papers are MUCH harder than the actual exam.

    In jan 2011, an A was 80/120 ... In june 2010, an A was 86/120.

    I would therefore say a specimen paper would propably, as it would be harder, less than 80/120 ... maybe like 70-75/120
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    (Original post by SarahTM)
    Can anyone help me?
    Enthalpy of solution. How low does the positive value have to be for it to count as a 'may' dissolve? :| up to 10kj or lower? :/
    I asked the same question to my teacher and he said that anything upto +55KJ will dissolve.
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    (Original post by Adam9)
    Have not done the specimen paper, but generally, specimen papers are MUCH harder than the actual exam.

    In jan 2011, an A was 80/120 ... In june 2010, an A was 86/120.

    I would therefore say a specimen paper would propably, as it would be harder, less than 80/120 ... maybe like 70-75/120
    January 2011 was a beast, I did it today, dunno how I got 86 lmao!
    Some days my chemistry is good and others, not!
    June 2010 was a lot easier, try it, you'll probably get 100+ in that!!!!!!
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    (Original post by mooniibuggy)
    Thank you, i'll probably just read storylines vaguely and not stress to much about it - I have the CGP guide somewhere but I've been revising mainly from CI and the revision guide. Do you think the CGP book is better at explaining things than the revision guide?

    Thank you and good luck to you
    I did not get the actual revision guide as I thaught it was too vague.

    With the actual revision guide, you should really use the revision guide and chemical ideas.

    However, I find with cgp that cgp alone is enough, as it covers things in great detail.

    But most at my school do not like cgp, so i dunno, maybe its just me



    good luck
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    does the equilibrium lie to the right in the dissociation reaction of strong acids and on the left of the weak ones? if so, why is that?
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    F335 June 2010, question 5 f)
    how do you calculate H+?
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    (Original post by zahre)
    I asked the same question to my teacher and he said that anything upto +55KJ will dissolve.
    Thank youu :]
    I guess my 64 was just a bit high then :]
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    Adam9, which past papers have you done so far? I only have the salters revision guide. I read through everything on 4college.co.uk this morning and read the revision guide the other day but I still feel like it hasn't all gone in yet (over the weeks I have been reading through CI).

    Also, have you learned the toolkit?
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    (Original post by SarahTM)
    Can anyone help me?
    Enthalpy of solution. How low does the positive value have to be for it to count as a 'may' dissolve? :| up to 10kj or lower? :/
    I don't think there is a set value. It depends on the surroundings it is in I think.
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    (Original post by pearlover)
    does the equilibrium lie to the right in the dissociation reaction of strong acids and on the left of the weak ones? if so, why is that?
    For our exam tomorrow.

    For strong acids, never do an equilibrium sign; just a normal ----> will do. As far as we are concerned, full dissociation has occurred.

    For weak acids, do an equilibrium sign, and the equilibrium will lie to the left hand side or the reactant side because barely any of it is dissociated. Remember, we assume in our calculations that none is dissociated.
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    Just got myself confused, what are the reagents and conditions for the coupling reaction? I read in the mark scheme about alkaline conditions but I'm pretty sure this isn't in the revision guide?
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    (Original post by Ro27)
    Is 82 out 120 on the specimen paper a decent enough score if looking at A grade people?!?!?! Not sure!
    It's probably around about borderline A. A grades are normally around about 80ish marks.
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    (Original post by AGM)
    For our exam tomorrow.

    For strong acids, never do an equilibrium sign; just a normal ----> will do. As far as we are concerned, full dissociation has occurred.

    For weak acids, do an equilibrium sign, and the equilibrium will lie to the left hand side or the reactant side because barely any of it is dissociated. Remember, we assume in our calculations that none is dissociated.
    thank you
    do you get the Kw value for water? can you explain about that abit please?
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    What are all the bond shapes and corresponding angles we need to know i.e. tetraheral = 109

    And which ones do we need to know how to draw the shape of. I know the shape of:
    tetrahedral
    bent
    triangular planar
    Pyrmidal
    Octahedral
    Linear

    Are there any others we need to know?
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    (Original post by prakruti)
    F335 June 2010, question 5 f)
    how do you calculate H+?
    -log([H+]) = 7.4

    [H+] ^ {-} = 10 ^ {7.4}

    [H+] = 1 / (10 ^ {7.4})

    [H+] = 3.98 x 10^-8
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    (Original post by JackWoot)
    -log([H+]) = 7.4

    [H+] ^ {-} = 10 ^ {7.4}

    [H+] = 1 / (10 ^ {7.4})

    [H+] = 3.98 x 10^8


    Oh that's perfect!!

    Thankssss
 
 
 
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