Hey there! Sign in to join this conversationNew here? Join for free
    Offline

    21
    ReputationRep:
    Answer to theboleic acid test?

    I wrote Sodium hydrogencarbonate test, because its a carboxylic acid or am i wrong??
    Offline

    1
    ReputationRep:
    (Original post by SuperHuman98)
    Answer to theboleic acid test?

    I wrote Sodium hydrogencarbonate test, because its a carboxylic acid or am i wrong??
    Didn't it have a double bond?
    I think Its bromine water then
    Offline

    1
    ReputationRep:
    (Original post by ICantFindMyName)
    Didn't it have a double bond?
    I think Its bromine water then
    I wrote bromine water too because the question was asking how to prove it was unsaturated, so i figured since the double bond makes the acid unsaturated thats what you would test for
    Offline

    3
    ReputationRep:
    (Original post by britishtf2)
    Good luck. I can't really remember much about it until I am asked about certain questions. Feel free to ask what I got for a question and I'll see if I can help
    Just made the unofficial Mark scheme. Feel free to correct any mistake. Thanks
    Offline

    14
    ReputationRep:
    (Original post by DaVinciGirl)
    Just made the unofficial Mark scheme. Feel free to correct any mistake. Thanks
    Cool. Will check over it.
    Offline

    2
    ReputationRep:
    (Original post by SuperHuman98)
    Also fml for the distillation question I wrote to heat it at 99 degrees celcsius rather than above, fml
    Isn't that the case? Shouldn't you be boiling it at this temperature so the isooctane condenses off into the condenser while octane drips back into the flask?
    Offline

    2
    ReputationRep:
    (Original post by metrize)
    I thought it was 3, i mighr be wrong though
    Thought it was 3 too but oh well haha
    Offline

    0
    ReputationRep:
    Has anyone got the link to the unofficial markscheme?
    Offline

    9
    ReputationRep:
    (Original post by sophie.03)
    Has anyone got the link to the unofficial markscheme?
    http://www.thestudentroom.co.uk/show....php?t=4156405 there you go
    Offline

    10
    ReputationRep:
    (Original post by Rrimmer98)
    Yeah the 'meth whatever it was' one, right?
    I think it was methylpropane
    Offline

    2
    ReputationRep:
    (Original post by DaVinciGirl)
    That is what I got too
    i did that my calulations were not exactly one down so i guessed 1 and rounded it
    Offline

    2
    ReputationRep:
    (Original post by rosemondtan)
    Isn't that the case? Shouldn't you be boiling it at this temperature so the isooctane condenses off into the condenser while octane drips back into the flask?
    yes thats correct i said, it is distilled becuse it vapourises into the condenser and the octane wiill move back in
    Offline

    2
    ReputationRep:
    (Original post by Enderbat1999)
    yes thats correct i said, it is distilled becuse it vapourises into the condenser and the octane wiill move back in
    Yeah quite sure that's it haha it has to be at or slightly lower than the boiling point of isooctane
    Offline

    7
    ReputationRep:
    (Original post by marcobruni98)
    I think it was methylpropane
    I also put that
    Offline

    10
    ReputationRep:
    (Original post by liziepie)
    I also put that
    Lovely stuff
    Offline

    2
    ReputationRep:
    (Original post by SuperHuman98)
    For the first question I might have do 4 or 5 significant figures on my answers will I lose the mark
    Didn't most of the questions say (to an appropriate amount of sig fig)...?
    Offline

    10
    ReputationRep:
    (Original post by AdamWallisjr)
    Didn't most of the questions say (to an appropriate amount of sig fig)...?
    It didn't say anything about significant figures
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by zigocarn)
    Tbf, 59/80 would mean an A is 73%, an A grade for the unit 2 paper in past years is always 80-85%. So I highly doubt it will be 73%, closer to 85%
    paper 2 has gone down to 67% for an A some times, so get your fact right.
    Offline

    2
    ReputationRep:
    Does anyone have any idea what the grade boundaries will be for the papers? This was my final exam so I can't hel but worry lol.
    Offline

    2
    ReputationRep:
    Is there an unofficial mark scheme for the Resit unit 2


    Posted from TSR Mobile
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    What's your favourite Christmas sweets?
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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

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