Turn on thread page Beta
    • Thread Starter
    Offline

    9
    ReputationRep:
    I cant really remember the order and these are just my answers so wont be perfect but here goes... ok i really cant remeber much please comment below

    1a a catalyst speeds up the rxn by way of an alternative route which has a lower activation energy

    1b experiment 2 steeper line but levelled off at same point
    experiment 3 levelled off at half of 1 and not very steep

    1c collision theory: more particles available so frequency of succesful collisions increases

    titrations:
    a I put something bout so theres no water left in burette but am sure that's wrong
    c fill in table
    b concordant was 23.95?

    d like 766.4mg??

    e about 97.8%


    polymers and isomers?


    double page spread of mechanisms:

    1. nucleophillic substituion

    2. elimnation, role of OH, base


    6 marker on substance that deccolourised bromine water:
    emprirical formula C3H5 molecular formual C6H10
    i drew cyclohexene and hexene with two doubel bonds and its electrophillic addition


    6 marker on tests: used tollens reagent to identify butanal the acidified potassium dichromate to identify secondary alchol butan 2 ol
    then i talked about IR spectroscopy and OH and CO groups and where these peaks would be for ketone and tertiary alchol


    equilibria:
    Kc =
    i got like 0.311
    and then 3.22 for the opposite way round of the reaction

    MC
    Which molecule could act as a nucleophile: PF3
    Which molecule is not polar: CBr4
    What’s the major product of the reaction: think it was C, Cl was connected to the Carbon the methyl group was attached
    Offline

    7
    ReputationRep:
    1c is according to the collision theory, why an increased concentration of the reactant can increase the rate of reaction (something like this


    decolourised bromine one i got c6h10=6*12+10=82 so i drew something with two double bonds.


    elimination the role is a base (i think
    • Thread Starter
    Offline

    9
    ReputationRep:
    (Original post by vivienne0402)
    1c is according to the collision theory, why an increased concentration of the reactant can increase the rate of reaction (something like this
    thanks
    Offline

    3
    ReputationRep:
    For the elimination the role of oh is a base
    Offline

    3
    ReputationRep:
    Does anyone remember what they got for the empirical formula and molecular formula for the first 6 marker?
    • Thread Starter
    Offline

    9
    ReputationRep:
    (Original post by Humzy_1)
    For the elimination the role of oh is a base
    ok thanks was not sure of that!
    Offline

    19
    ReputationRep:
    If it helps, I remember the mark distribution was 6,9,6,15,6,9,6,8,15
    Offline

    9
    ReputationRep:
    Would I get the mark for putting 0.312 in the equilibria one?
    Offline

    3
    ReputationRep:
    For the question on Citric acid i got 764mg and 97 percent purity?
    Offline

    7
    ReputationRep:
    (Original post by Humzy_1)
    Does anyone remember what they got for the empirical formula and molecular formula for the first 6 marker?
    i got c3h5 and c6h10
    • Thread Starter
    Offline

    9
    ReputationRep:
    (Original post by nyxnko_)
    If it helps, I remember the mark distribution was 6,9,6,15,6,9,6,8,15
    wow ok that may help
    (Original post by Thanu123)
    For the question on Citric acid i got 764mg and 97 percent purity?
    anyone else get either of those cos im not sure
    Offline

    11
    ReputationRep:
    (Original post by Thanu123)
    For the question on Citric acid i got 764mg and 97 percent purity?
    I got that!! And a 1. Something percentage uncertainty
    Offline

    7
    ReputationRep:
    (Original post by Clarareeves2001)
    wow ok that may help
    anyone else get either of those cos im not sure
    i got 764mg and 97% as well
    • Thread Starter
    Offline

    9
    ReputationRep:
    (Original post by vivienne0402)
    i got 764mg and 97% as well
    ok have no idea what i did there then thanks
    Offline

    5
    ReputationRep:
    (Original post by Clarareeves2001)
    I cant really remember the order and these are just my answers so wont be perfect but here goes... ok i really cant remeber much please comment below

    1a a catalyst speeds up the rxn by way of an alternative route which has a lower activation energy

    1b experiment 2 steeper line but levelled off at same point
    experiment 3 levelled off at half of 1 and not very steep

    1c collision theory: more particles available so frequency of succesful collisions increases

    titrations:
    a I put something bout so theres no water left in burette but am sure that's wrong
    c fill in table
    b concordant was 23.95?

    d like 764mg??

    e about 97% or something


    polymers and isomers?


    double page spread of mechanisms:

    1. nucleophillic substituion

    2. elimnation, role of OH, base


    6 marker on substance that deccolourised bromine water:
    emprirical formula C3H5 molecular formual C6H10
    i drew cyclohexene and hexene with two doubel bonds and its electrophillic addition


    6 marker on tests: used tollens reagent to identify butanal the acidified potassium dichromate to identify secondary alchol butan 2 ol
    then i talked about IR spectroscopy and OH and CO groups and where these peaks would be for ketone and tertiary alchol


    equilibria:
    Kc =
    i got like 0.311
    and then 0.322 for the opposite way round of the reaction CBr4 had no dipoles c was mean energy on curve
    Your answer to 1b was incorrect. They all level off at the same number but at different rates. 2 was the fastest reaction and 3 was the slowest, on the table it says 50 for all of them.
    Offline

    3
    ReputationRep:
    (Original post by Bright Student)
    Your answer to 1b was incorrect. They all level off at the same number but at different rates. 2 was the fastest reaction and 3 was the slowest, on the table it says 50 for all of them.
    Not too sure but i think the concentration of it was 0.5 so a half of what it was in experiment 1
    Offline

    3
    ReputationRep:
    The 6 marker on test tube reactions was kinda weird. Felt like the wording was kinda strange.

    What were u meant to write?
    Offline

    11
    ReputationRep:
    (Original post by Thanu123)
    Not too sure but i think the concentration of it was 0.5 so a half of what it was in experiment 1
    I did the 0.5 one was half of the original one and then for the one where the catalyst was a powder I did it goes to the same as the original line but at a quicker rate
    Offline

    9
    ReputationRep:
    What do you think the grade boundaries will be like out of 160
    Posted on the TSR App. Download from Apple or Google Play
    Offline

    11
    ReputationRep:
    (Original post by Thanu123)
    The 6 marker on test tube reactions was kinda weird. Felt like the wording was kinda strange.

    What were u meant to write?
    Fehlings and tollens and not sure about the rest
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: June 22, 2018

1,332

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.