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***2015 LC Chemistry - Higher Level - June 16th***

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  • 16-06-2015 5:26pm
    #1
    135083
    Registered Users Posts: 12 ✭


    Did anyone else find that tough? Think I did better in the mocks!


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    #2
    MmmPancakes
    Registered Users Posts: 712 ✭✭✭MmmPancakes


    That was pretty difficult


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    #3
    ImRebecca
    Registered Users Posts: 155 ✭✭ImRebecca


    135083 wrote: »
    Did anyone else find that tough? Think I did better in the mocks!

    I thought it was the worst chemistry test I ever did! Kissed my A1 goodbye


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    #4
    Chocolalla
    Registered Users Posts: 26 ✭Chocolalla


    I loved ittttttttti


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    #5
    12hello345
    Registered Users Posts: 7 ✭12hello345


    That was so hard worst exam ever was hoping for A definitely only managed a C , ffs I hate the sec


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    #6
    dazzadazza
    Registered Users Posts: 117 ✭✭dazzadazza


    I thought the questions were asked in an awkward way. For example instead of asking for the trends across and down a group they asked for bigger and smaller atoms.

    I still felt like I gave everything a decent shot. I'm thinking B1 A2.


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    #7
    dazzadazza
    Registered Users Posts: 117 ✭✭dazzadazza


    Chocolalla wrote: »
    I loved ittttttttti

    Do you reckon you got that A1?


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    #8
    blue_velvet
    Registered Users Posts: 16 ✭blue_velvet


    Could anyone do the formation of ethanol question?I couldn't get the right equation for combustion of ethanol


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    #9
    Noire
    Registered Users Posts: 47 ✭Noire


    Pretty hard paper, all the experiment questions were pretty tricky imo


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    #10
    dazzadazza
    Registered Users Posts: 117 ✭✭dazzadazza


    blue_velvet wrote: »
    Could anyone do the formation of ethanol question?I couldn't get the right equation for combustion of ethanol

    I think it was C2H5OH + 3O2 ---> 2CO2 + 3H2O


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    #11
    Chocolalla
    Registered Users Posts: 26 ✭Chocolalla


    dazzadazza wrote: »
    Do you reckon you got that A1?

    I hope re , u ??


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    #12
    135083
    Registered Users Posts: 12 ✭135083


    Hopefully still got the A1, but didn't like the paper at all. Was less of a "throw down everything you know off by heart paper" and moreso one where you had to really work them out IMO. What did you guys do for the equilibrium question, multiply Kc by 10 then solve the quadratic?


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    #13
    dazzadazza
    Registered Users Posts: 117 ✭✭dazzadazza


    Chocolalla wrote: »
    I hope re , u ??

    Not too sure about an A1 because there were a few parts where I relied on waffle. I'll settle for an A2 B1 though.


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    #14
    MmmPancakes
    Registered Users Posts: 712 ✭✭✭MmmPancakes


    135083 wrote: »
    Hopefully still got the A1, but didn't like the paper at all. Was less of a "throw down everything you know off by heart paper" and moreso one where you had to really work them out IMO. What did you guys do for the equilibrium question, multiply Kc by 10 then solve the quadratic?

    Yeah, what did you get for 'x'? I think I got like 15.32 or something


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    #15
    The_N4sir
    Registered Users Posts: 213 ✭✭The_N4sir


    That was a harder paper than I thought it would be. Was going for an A1 but i would be happy with a A2/B1 on that paper.

    Anyone else get 20 for the x value in question 11? Cant remember exactky but was a nice whole number


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    #16
    Chocolalla
    Registered Users Posts: 26 ✭Chocolalla


    What talk get for the value oh heat of formation ??


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    #17
    The_N4sir
    Registered Users Posts: 213 ✭✭The_N4sir


    Chocolalla wrote: »
    What talk get for the value oh heat of formation ??

    Around -270 kJ/mol


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    #18
    Blue giant
    Registered Users Posts: 1,336 ✭✭✭Blue giant


    It could have been worse was my first thought. Roughly added up my marks at the end of the exam and I reckon I got a B1/B2. I'm just happy to be finished :D


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    #19
    blue_velvet
    Registered Users Posts: 16 ✭blue_velvet


    dazzadazza wrote: »
    I think it was C2H5OH + 3O2 ---> 2CO2 + 3H2O

    I had that! Just couldn't get the question to work out


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    #20
    Alex Meier
    Closed Accounts Posts: 663 ✭✭✭Alex Meier


    MmmPancakes wrote: »
    Yeah, what did you get for 'x'? I think I got like 15.32 or something

    X = 20

    Number of gaseous moles = 5 mol/L or 50 mol/10L


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    #21
    Ima_mokster
    Registered Users Posts: 39 ✭Ima_mokster


    Worst paper ive seen in terms of wording, was hoping for a definite A1, I'll take an A2 now tbh.. anyone know the initial appearance of phenylmethanol before KMNO4^-1? Paper was much like what I heard about the biology in that it wasn't as accessible as previously imo


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    #22
    OMGeary
    Registered Users Posts: 251 ✭✭OMGeary


    Alex Meier wrote: »
    X = 20

    Number of gaseous moles = 5 mol/L or 50 mol/10L

    Think thats right. I got x to be 2 because I divided by 10, and got 5 overall :)


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    #23
    Deranged96
    Registered Users Posts: 588 ✭✭✭Deranged96


    Hard but not cruel.

    I know of two calculations I messed up already :(

    But sure be grand


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    #24
    expiiplus1
    Closed Accounts Posts: 71 ✭✭expiiplus1


    Why would you multiply by 10 in the equilibrium problem? I'm really nervous about that part of the paper.
    My reasoning was that the only thing that could affect Kc was temperature and that remained the same...


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    #25
    Bah_Humbug
    Registered Users Posts: 45 ✭Bah_Humbug


    kindof crying, never not gotton an A1 in chemistry and then BAM


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    #26
    Iamtheduchess
    Registered Users Posts: 46 ✭Iamtheduchess


    No A1, more like a C1. So disappointed!
    Thankfully had gone over catalysts etc!


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    #27
    MmmPancakes
    Registered Users Posts: 712 ✭✭✭MmmPancakes


    Can someone do the solution to that equillibrium question?


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    #28
    Doctorhopeful
    Registered Users Posts: 200 ✭✭Doctorhopeful


    The_N4sir wrote: »
    That was a harder paper than I thought it would be. Was going for an A1 but i would be happy with a A2/B1 on that paper.

    Anyone else get 20 for the x value in question 11? Cant remember exactky but was a nice whole number

    I got about 12ish, i saw how the quadratic would be 20/60 but the equation didn't work out so i had to use the quadratic formula. Is x=20 would you not have gotten a negative figure for A as A was 30 -2x at equil??


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    #29
    Ima_mokster
    Registered Users Posts: 39 ✭Ima_mokster


    Im pretty sure x=10?


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    #30
    Doctorhopeful
    Registered Users Posts: 200 ✭✭Doctorhopeful


    Hard exam, the way they asked for stuff was really convoluted sometimes. Did 9 Qs but did them well, still think i'm on track for an A, whether it's an A1 or A2 depends on the marking scheme i think. Glad it's over. The experiments were perfect btw, did all three!


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    #31
    The_N4sir
    Registered Users Posts: 213 ✭✭The_N4sir


    Doctorhopeful wrote: »
    I got about 12ish, i saw how the quadratic would be 20/60 but the equation didn't work out so i had to use the quadratic formula. Is x=20 would you not have gotten a negative figure for A as A was 30 -2x at equil??

    I took A as 30-x so I guess i'll have to see what others got


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