Turn on thread page Beta
    Offline

    0
    ReputationRep:
    Unofficial mark scheme?
    Offline

    2
    ReputationRep:
    (Original post by Questioner1234)
    Yeah
    So if i remember rightly it would've been...
    m/mr
    0.88/328.2=0.00268 (0.0027)
    5 moles of gas produced, so 5x24=120
    120x0.0027=0.324 (0.32dm*3)
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Ben_14)
    So if i remember rightly it would've been...
    m/mr
    0.88/328.2=0.00268 (0.0027)
    5 moles of gas produced, so 5x24=120
    120x0.0027=0.324 (0.32dm*3)
    That's the answer I got.
    Offline

    7
    ReputationRep:
    Grade boundaries?


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by PrimeLime)
    That's the answer I got.
    Awesome
    Offline

    2
    ReputationRep:
    (Original post by dont leave blank)
    Grade boundaries?


    Posted from TSR Mobile
    Probably quite high 59/80 A?
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Ben_14)
    Probably quite high 59/80 A?
    I was hoping for high UMS...
    I do think it was quite a standard paper though so expecting grade boundaries to be somewhat normal.
    Offline

    2
    ReputationRep:
    (Original post by PrimeLime)
    I was hoping for high UMS...
    you and me both! Tbh, the paper was lovely. Some of the questions might of led you to waffle on a bit, but there was really anything that was overly difficult. Thats not to say i think i aced it though lol Made quite a few stupid mistakes :/
    Offline

    2
    ReputationRep:
    (Original post by Ben_14)
    should've been something along the lines of

    -50x4.12x6.2/0.025 (pretty sure that was the moles value)
    then divide by a 1000 to convert joules to KJ
    so the answer was -55kJ mol^-1?
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Ben_14)
    you and me both! Tbh, the paper was lovely. Some of the questions might of led you to waffle on a bit, but there was really anything that was overly difficult. Thats not to say i think i aced it though lol Made quite a few stupid mistakes :/
    I made WAY more stupid mistakes then I usually do. It's always a bad feeling messing up a nice paper. I know why though. I managed my time very well UNTIL I spent 10 minutes trying to figure out what they wanted in the graph question only to mess it up anyway.
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by goodies)
    so the answer was -55kJ mol^-1?
    Well, 'the' answer was roughly that, yes. Keep in mind different people had different temperature rises.
    Offline

    0
    ReputationRep:
    messed up so bad on the last page. In tilly I put the volume as 25cm3 but then the conc. Was the same so I changed it to 20 which is SO stupid of me!! I'm also a little thrown off with the temperature change why do a lot of you have 6.6? I extrapolated and got 1.2...
    Offline

    2
    ReputationRep:
    (Original post by Aylaar)
    messed up so bad on the last page. In tilly I put the volume as 25cm3 but then the conc. Was the same so I changed it to 20 which is SO stupid of me!! I'm also a little thrown off with the temperature change why do a lot of you have 6.6? I extrapolated and got 1.2...
    How did you get 1.2??? the temperate was 24 initially then went up to over 30. and 30-24=6.
    Offline

    5
    ReputationRep:
    Anyone got the paper to have another look at?
    Offline

    0
    ReputationRep:
    (Original post by goodies)
    How did you get 1.2??? the temperate was 24 initially then went up to over 30. and 30-24=6.
    I extrapolated and got 1.2 ? Everyone else in my school did too
    Offline

    1
    ReputationRep:
    I was sorta confused with the graph - were you meant to do two lines of best fit and where they crossed were the points you needed? (Usually it's just a curve, a vertical line when you add the reactant and then you extrapolate to the line.) I'd never seen one with two lines of best fit and paniced!
    I think I got 6.2 for the temp change and 21.5 for the vol!
    Offline

    2
    ReputationRep:
    For the graph did you guys ignore the first result as it was anomalous? I ignored it and got 5.4 as temp rise
    • Thread Starter
    Offline

    3
    ReputationRep:
    (Original post by Daedalys)
    I was sorta confused with the graph - were you meant to do two lines of best fit and where they crossed were the points you needed? (Usually it's just a curve, a vertical line when you add the reactant and then you extrapolate to the line.) I'd never seen one with two lines of best fit and paniced!
    I think I got 6.2 for the temp change and 21.5 for the vol!
    I got 6.2. Although later I realised that wasn't my temperature rise and so had to change my graph to match it XD (obviously couldn't go back and change all my calculations! There were only 10 seconds or so left!!). As a results my two lines had a very strange intersection; I'd be amazed if the examiner lets me off with it..
    22.5 for the volume, but then again, my lines were not really of the best fit...
    Oh well, I'm dropping the stupid subject next year. Only have to scrape an A in chem, so no need for high UMS fortunately. But if I was applying for medicine I'd probably be depressed right now LOL.
    Offline

    1
    ReputationRep:
    I thought that exam was horrible... why were there so many tricky calculation questions? I'm really hoping they give me lots of method marks as I think most of my calculation results weren't right... I just got in such a tangle!

    Anyone got/ going to get from teachers, an unofficial mark scheme? Someone's teacher did it for the maths exam and it calmed me down.
    I prefer to know if I've done badly than to worry!
    Offline

    1
    ReputationRep:
    I got 1.2 as well
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: August 14, 2015

1,971

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.