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    How did everyone find it? I found the Foundation paper absolutely enjoyable to do, however, HFHF was a total nightmare... does anybody know, do they deduct marks if you forget to put a '+' sign in front of an enthalpy calculation, where dH is +ve? Also, do they award full marks for a question if you've written the correct answer, but drawn the incorrect/no cycle?
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    Hey! i did both the papers today aswel, thought they were both ok, but im retaking and its my last chance so its a good job i did! what did u get for that 1st enthalpy calculation on HFHF? i got 860 or summut around there i think, and i put it as -ve but i dunno if it was, that was the only q i think i messed up on, aprt from stupid mistakes! i dont think they deduct marks for not putting the sign on a +ve thingy, but i dunno about the cycles! i shud think most of the marks wil b given if the right answer is there!
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    (Original post by annaholden)
    Hey! i did both the papers today aswel, thought they were both ok, but im retaking and its my last chance so its a good job i did! what did u get for that 1st enthalpy calculation on HFHF? i got 860 or summut around there i think, and i put it as -ve but i dunno if it was, that was the only q i think i messed up on, aprt from stupid mistakes! i dont think they deduct marks for not putting the sign on a +ve thingy, but i dunno about the cycles! i shud think most of the marks wil b given if the right answer is there!
    Hey i got that for the first enthalpy too ... The second one i got +80, except i didn't put the '+' sign :mad: ... Also i did draw the cycles out (well, of some sort, anyway) but they were extremely scruffy and had crossings out all over the place :rolleyes: :confused:

    For the question with the diamond and graphite, what did you put for pressure? I said it should be high pressure as high pressure favours the forward reaction 'cos the density of diamond is more, it takes up less space... or summink along those lines... :confused:
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    i sat chains and rings and it was good stuff! only thing that threw me a bit was the isomers of butene thing.. i cud only think of 1 more that they hadnt done..
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    (Original post by mongoose)
    How did everyone find it? I found the Foundation paper absolutely enjoyable to do, however, HFHF was a total nightmare... does anybody know, do they deduct marks if you forget to put a '+' sign in front of an enthalpy calculation, where dH is +ve? Also, do they award full marks for a question if you've written the correct answer, but drawn the incorrect/no cycle?
    Totally agree about the HFHF being a nightmare!!! Was expecting it to be the easiest paper! Thought chains and rings was great... thank god!
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    (Original post by mongoose)
    Hey i got that for the first enthalpy too ... The second one i got +80, except i didn't put the '+' sign :mad: ... Also i did draw the cycles out (well, of some sort, anyway) but they were extremely scruffy and had crossings out all over the place :rolleyes: :confused:

    For the question with the diamond and graphite, what did you put for pressure? I said it should be high pressure as high pressure favours the forward reaction 'cos the density of diamond is more, it takes up less space... or summink along those lines... :confused:

    i got the 80 aswel! and same about the + sign, but i dont think that shud matter!
    and the pressure one i put the same, with the same reason! yey!

    was jsut thinking tho,, u know that 11 mark question, about intermolecular forces, what did u do? coz i drew out the shapes o2 water and methane n tlked about that more than the intermolecular forces between the molecules, i dunno tho, what did u do?
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    (Original post by annaholden)
    i got the 80 aswel! and same about the + sign, but i dont think that shud matter!
    and the pressure one i put the same, with the same reason! yey!

    was jsut thinking tho,, u know that 11 mark question, about intermolecular forces, what did u do? coz i drew out the shapes o2 water and methane n tlked about that more than the intermolecular forces between the molecules, i dunno tho, what did u do?
    For the essay Q i was quite well prepared as a similar essay Q appeared in the mock i did For methane i wrote that the only significant IM forces were van der Waal's forces/instantaneous dipole-induced dipole forces, and for water that the most significant IM forces were Hydrogen bonds. OMG ... was the question a comparison question??? 'Cos i didn't compare their relative strengths :confused: What was the precise question again???

    For part B wrote about ice being less dense than water, and water having a high surface tension/viscosity.......

    ....So anybody know whether they give full marks in HFHF if you've written the answer correctly, but drawn out the incorrect/no cycle?
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    (Original post by mongoose)
    For the question with the diamond and graphite, what did you put for pressure? I said it should be high pressure as high pressure favours the forward reaction 'cos the density of diamond is more, it takes up less space... or summink along those lines... :confused:
    that was an interesting question. if you read the question it said something like " use the information given at the start of the question to predict what -pressure -temp required etc."

    and at the start it said "At high pressure this equilibrium is set up"
    so i said that high pressure is required to maintain the equilibrium
    and for the temp i said high temp required because forward reaction is endothermic

    is that corect??

    also which was more stable- i said graphite because something about exothermic in reverse reaction.

    oh yeah and how DARE they put a question on teh friggin BACK PAGE (for far how fast apper) omg..i only saw that question with literally 5mins to go.. jesus.
    anf what did everyone put for the very last qestion
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    (Original post by hihihihi)
    that was an interesting question. if you read the question it said something like " use the information given at the start of the question to predict what -pressure -temp required etc."

    and at the start it said "At high pressure this equilibrium is set up"
    so i said that high pressure is required to maintain the equilibrium
    and for the temp i said high temp required because forward reaction is endothermic

    is that corect??

    also which was more stable- i said graphite because something about exothermic in reverse reaction.

    oh yeah and how DARE they put a question on teh friggin BACK PAGE (for far how fast apper) omg..i only saw that question with literally 5mins to go.. jesus.
    anf what did everyone put for the very last qestion
    What was the question? I didn't think the back page was too bad. I was quite surprised there was no extended-answer question though.
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    (Original post by mongoose)
    What was the question? I didn't think the back page was too bad. I was quite surprised there was no extended-answer question though.
    the question wasnt bad but it was just that i didnt SEE the question because i didnt check to turn it over (stupid i know!!) until like 5mins to go.
    the question was on suggest why the H2 combustion reaction was likely to explode or something
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    (Original post by hihihihi)
    the question wasnt bad but it was just that i didnt SEE the question because i didnt check to turn it over (stupid i know!!) until like 5mins to go.
    the question was on suggest why the H2 combustion reaction was likely to explode or something
    lol. Yes, i remember that Q... can't remember what i wrote, i woffled on with some random explanation! T'was only one mark :mad: bta a point here and there could mean an entire grade
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    Got a nosebleed at the end of the HFHF paper. Most of the Chains and Rings paper ended up covered in blood. I did consider attempting to write in it to give the examiner the impression I was a psychopathic loonie...but thought against it. Evil invigilators didn't even offer me a tissue. Hmph.
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    (Original post by PermaBored)
    Got a nosebleed at the end of the HFHF paper. Most of the Chains and Rings paper ended up covered in blood. I did consider attempting to write in it to give the examiner the impression I was a psychopathic loonie...but thought against it. Evil invigilators didn't even offer me a tissue. Hmph.
    wow what a coincidence- someone from that exact exam this morning got a nose bleed, during the exam from what i saw as he was sitting infront of me- however he was given tissues and escorted somehwere- toilet i guess
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    (Original post by hihihihi)
    the question wasnt bad but it was just that i didnt SEE the question because i didnt check to turn it over (stupid i know!!) until like 5mins to go.
    the question was on suggest why the H2 combustion reaction was likely to explode or something
    I put that because the reaction was very exothermic there would be alot of energy released in a very short period of time causing the air to heat up very quickly and rapidly expand causing an explosion........ complete crap but by the time i'd reached the last question i was losing the will to live!
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    correct answers get full marks regardless of working

    a + sign isnt needed if the delta H is positive
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    (Original post by hihihihi)
    that was an interesting question. if you read the question it said something like " use the information given at the start of the question to predict what -pressure -temp required etc."

    and at the start it said "At high pressure this equilibrium is set up"
    so i said that high pressure is required to maintain the equilibrium
    and for the temp i said high temp required because forward reaction is endothermic

    is that corect??

    also which was more stable- i said graphite because something about exothermic in reverse reaction.

    oh yeah and how DARE they put a question on teh friggin BACK PAGE (for far how fast apper) omg..i only saw that question with literally 5mins to go.. jesus.
    anf what did everyone put for the very last qestion

    hi pressure has no effect on equilibrium involving solids, but high pressure was needed simply to compress graphite

    graphite was more stable because reaction was endo so would need a high Ea compared to exo reaction to form diamond
 
 
 

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