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OCR B F335 - Chemistry by Design - 13th June 2012

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    (Original post by Princess Kawaii)
    Yup..oh okay...I got that wrong then haha

    what did u get for the ratio question...was 7.14 right?
    Sorry - I got 0.14 but it's not even a ratio!
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    (Original post by InkyOne)
    Sorry - I got 0.14 but it's not even a ratio!
    yeah i got that too
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    (Original post by Beffnaay)
    What did people get for the salt to acid ratio?!
    1:8 maybe? i cant remember!
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    (Original post by InkyOne)
    Sorry - I got 0.14 but it's not even a ratio!
    0.14 to 1 is equal to 1 to 7.14 (right?) so I think they are both technically right
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    (Original post by georgie94)
    0.14 to 1 is equal to 1 to 7.14 (right?) so I think they are both technically right
    Yes.
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    (Original post by aim28)
    I put -38, do you know what the right answer was??
    The right answer is -38 i think. I have seen the paper today and looked through the questions and i am pretty sure that is what i put now as i have no clue how you could get +38. Looking back at the paper there were some tricky bits but it wasnt as bad as a first thought, lucky for me i think i have managed to fluke some answers.
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    (Original post by Dixie)
    so is everyone thinking that the grade boundaries will be low for this like 81 and below?
    It was 80 for the january paper (I think- its definitely been 80 before anyway!) so I'm hoping lower (mid to high 70s??) as this was definitely a lot harder
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    (Original post by I failed badly)
    The right answer is -38 i think. I have seen the paper today and looked through the questions and i am pretty sure that is what i put now as i have no clue how you could get +38. Looking back at the paper there were some tricky bits but it wasnt as bad as a first thought, lucky for me i think i have managed to fluke some answers.
    As you have looked at the paper can you put some of the middle questions on here!!! Or a mark scheme!!!
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    for the 3rd ionisation of Zn did we have to put the state symbol of gas because I completely forgot that!!!
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    (Original post by bertiejess)
    for the 3rd ionisation of Zn did we have to put the state symbol of gas because I completely forgot that!!!
    I think so, it said 'include state symbols' and that really confused me... I think I put they were aqueous which is wrong but I had complete brain fade
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    (Original post by Princess Kawaii)
    can anyone explain how u were supposed to find the concnetration of Nitrogen using the Oxygen concentration?

    And then for the ratio question what did people get?

    I got 7.14 But I didnt write that and for some reason wrote 7:1
    The concentration of oxygen worked out by doing 0.2 (parts of oxygen) divided by 24 and that gave 8.3.....
    The nitrogen was found by doing 0.8 (ratio of 4:1) divide by 24 to give 3.3x10^-2 or something


    This was posted from The Student Room's iPhone/iPad App
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    hey, but off topic but does anyone do edexcel biology? is there a thread for the B5 exam...cant find one on here. Sorry for the hijack
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    (Original post by master_blaster66)
    yeah i got that too
    they asked for a ratio?! I just put down 0.14 thinking that's the right answer :O I think i'm blind. I didn't even read the question properly
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    (Original post by sunshinesmile10)
    hey, but off topic but does anyone do edexcel biology? is there a thread for the B5 exam...cant find one on here. Sorry for the hijack
    22nd June?

    http://www.thestudentroom.co.uk/show...2#post38129469

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    (Original post by InkyOne)
    Sorry - I got 0.14 but it's not even a ratio!
    i got 0.14:1 too but you should be fine because in past mark schemes the anwser was just one number not a ratio, which is wrong but at least you get the marks!
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    (Original post by 14loubylou)
    i got 0.14:1 too but you should be fine because in past mark schemes the anwser was just one number not a ratio, which is wrong but at least you get the marks!
    Yeah, that's why i didn't put a ratio - did in the past but was marked down, but I think that was just my teacher being fussy...
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    Who has got the paper then?
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    well they did show you one divided by the other
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    lol, and here i am meant to be doing chemistry at imperial next year!

    It is going to be sooo embarising when i dont get in for actually failing chemistry!
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    about the ratio thing i looked at past papers and the correct answers were not ratios so i didn't put a ratio. Not that i knew how to do that even if i had to but i feel like 0.14 should be correct

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