Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta

OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD watch

    Offline

    1
    ReputationRep:
    (Original post by huey1)
    Hi, watch this video and it will explain how to last question https://www.youtube.com/watch?v=UuEfvamQrP4

    Please can you send me F324 and F324 2015 paper as i desperately need them?
    Hi thanks I will do
    Really sorry but it was from our teacher so I don't have access to it myself, if i find it i will post on here
    Offline

    3
    ReputationRep:
    (Original post by Hunnybeebee)
    acc gonna fail F324 from NMR, and going to fail F325 100% :'(
    Tell me about it!! I have my I S AA tomorrow and its the evluative on identifying 2 weak acids -__- my last attempt to bump my grade up and IDK wth to do pm somebody
    Offline

    16
    ReputationRep:
    (Original post by 28Ikky)
    Tell me about it!! I have my I S AA tomorrow and its the evluative on identifying 2 weak acids -__- my last attempt to bump my grade up and IDK wth to do pm somebody
    Doing F325 revision as we speak. I'm really starting to think that it's just practice and practice, but I thought that last year and OCR really wrecked it for me in F321
    Offline

    0
    ReputationRep:
    Hi I am tutoring someone for F325 resit. I am a PhD student but really need the June 2015 past paper and mark scheme if someone can please get it from their school? I am happy to provide help with any specific questions on here.
    Offline

    13
    ReputationRep:
    (Original post by mechanism)
    Guys - does anyone know how to do the last question F324 June 2015? I really can't get my head around it.
    https://www.youtube.com/watch?v=UuEfvamQrP4
    This may help with that
    Offline

    0
    ReputationRep:
    (Original post by 28Ikky)
    Tell me about it!! I have my I S AA tomorrow and its the evluative on identifying 2 weak acids -__- my last attempt to bump my grade up and IDK wth to do pm somebody
    Any tips on what to revise
    Offline

    3
    ReputationRep:
    You know cos the paper is synoptic with AS, does anybody know how much AS I should revise? Would it be worth me going over a few papers?
    Offline

    3
    ReputationRep:
    Also, I achieved an A at AS, does anybody know what is the lowest grade I can achieve on F326 to still get an A* or an A provided I achieve high marks on the exams??
    Offline

    3
    ReputationRep:
    (Original post by AqsaMx)
    Also, I achieved an A at AS, does anybody know what is the lowest grade I can achieve on F326 to still get an A* or an A provided I achieve high marks on the exams??
    480 ums to get an A

    Lets say you got 240 at AS, and you get A in f324 and f325, tallying up to 240+120+72 = 432

    Youd need 40 ums out of 60 for an A in f326, which is like 33 out of 40 (high C)
    Offline

    3
    ReputationRep:
    (Original post by zirak46)
    480 ums to get an A

    Lets say you got 240 at AS, and you get A in f324 and f325, tallying up to 240+120+72 = 432

    Youd need 40 ums out of 60 for an A in f326, which is like 33 out of 40 (high C)
    33 is a b? But thank you
    Offline

    3
    ReputationRep:
    (Original post by AqsaMx)
    33 is a b? But thank you
    I think grade boundaries were 37 for A and 34 for B, i may be mistake, best to be safe and think its higher
    Offline

    15
    ReputationRep:
    (Original post by Sade_101)
    Can someone help with this question please:

    A 25.0 cm3 portion of a solution containing Fe2+ and Fe3+ ions was acidified and titrated against potassium permanganate (VII) solution. 15.0 cm3 of a 0.0200 mol dm-3 solution of potassium manganate (VII) were required. A second 25.0cm3 portion was reduced with zinc and titrated against the same manganate solution. This time 19.0cm3 of the oxidant was required.
    a) calculate the concentrations of Fe2+ and Fe3+ ions in the solution
    b) what percentage of the total iron content of the solution was Fe3+

    So far I've done:
    MnO4- + 8H+ + 5Fe2+ ---> Mn2+ + 4H2O + 5Fe3+
    mole of MnO4 = 3x10-4 mol and mole of Fe2+ = 1.5x10-3 mol (1:5 mole ratio)
    concentration of Fe2+ = 0.06 moldm-3

    I have no idea how to work out the concentration of Fe3+
    What is the actual answer? I got Fe3+ = 0.032 moldm-3 for this but could be wrong
    Offline

    3
    ReputationRep:
    (Original post by zirak46)
    I think grade boundaries were 37 for A and 34 for B, i may be mistake, best to be safe and think its higher
    It was 33 for B, but if I got 33, I can't get an A* even if I get above 90 on both exams?
    Offline

    1
    ReputationRep:
    has anyone done a qual on transition metals? have it tomorrow
    Offline

    2
    ReputationRep:
    Does anyone know how strict examiners when asking for the conditions required for a reaction? (i.e. if I were to write H2SO4 instead of concentrated H2SO4, would I then lose credit?)
    Offline

    19
    ReputationRep:
    (Original post by rory58824)
    Does anyone know how strict examiners when asking for the conditions required for a reaction? (i.e. if I were to write H2SO4 instead of concentrated H2SO4, would I then lose credit?)
    I would think so, as H2SO4(aq) probably wouldn't work.
    Offline

    4
    ReputationRep:
    (Original post by rory58824)
    Does anyone know how strict examiners when asking for the conditions required for a reaction? (i.e. if I were to write H2SO4 instead of concentrated H2SO4, would I then lose credit?)
    I thought they usually say ignore concentrated or dilute but you'd need to say aq for ester hydrolysis? I might be wrong!


    Posted from TSR Mobile
    Offline

    2
    ReputationRep:
    (Original post by Saywhatyoumean)
    I thought they usually say ignore concentrated or dilute but you'd need to say aq for ester hydrolysis? I might be wrong!


    Posted from TSR Mobile
    I've seen some mark schemes which may say (conc.) H2SO4 for example, but like alow said, stating H2SO4 (aq) would be wrong in a reaction such as oxidising an primary alcohol.

    I think it might just be best to remember everything and not leave anything out!
    Offline

    5
    ReputationRep:
    Most of the time it says ignore Ref to Concentration on the mark scheme. Although I have seen times where it says conc but I'm not sure I've ever seen dilute?

    So when it asks for reagents I just put concentrated and either way it'll normally be right.
    Offline

    15
    ReputationRep:
    (Original post by rory58824)
    Does anyone know how strict examiners when asking for the conditions required for a reaction? (i.e. if I were to write H2SO4 instead of concentrated H2SO4, would I then lose credit?)
    Most of the time they ignore it
    I've only seen when it's required for esters and for the reduction of nitrobenzene - pretty sure you must state concentrated H2SO4 and concentrated HCl for those ones
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: September 26, 2016
Poll
Do you agree with the proposed ban on plastic straws and cotton buds?

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.