Join TSR now and get all your revision questions answeredSign up now
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    Hi how are you


    Benzene, is a cyclic hydrocarbon and contains only carbon and hydrogen only. It is a trigonal planar (molecule/structure) and bond angle around each carbon atom is 120. Benzene has 4 outer shells of electrons, three of these electrons are shared between a carbon atom and one of the hydrogen atom, this called sigma bond and is sited above and below the plane of the carbon (C-C) bond. The 4th outer shell of electron is the 2p orbital in which the p orbital overlaps and creates a region of high electron density. The benzene is delocalised as the electrons are shared between the 6 carbon atoms , through out the whole structure. Also, in benzene the c-c bond length is the same.
    you got full marks,

    what causes optical isomerism? [2]
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    you got full marks,

    what causes optical isomerism? [2]
    ok thanks!


    If a chiral carbon is present in which the carbon is attached to 4 different atoms/groups of atoms and also that the 2 images are non-superimposable images of each other.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by AishaTara)
    got a feeling its going to be a killer paper :/
    Do you mean that it will be hard?
    Offline

    3
    ReputationRep:
    (Original post by otrivine)
    Do you mean that it will be hard?
    after the nice jan paper, yeah :/
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    ok thanks!


    If a chiral carbon is present in which the carbon is attached to 4 different atoms/groups of atoms and also that the 2 images are non-superimposable images of each other.
    excellent answer, worth 3, infact,

    my turn!
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    excellent answer, worth 3, infact,

    my turn!
    Thanks


    Stage the reagents and conditions needed for going from 3-chloropropan-1-ol to 3-aminopropan-1-ol (3)
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by AishaTara)
    after the nice jan paper, yeah :/
    Its better being slightly hard than having a grade boundary of 51/60 for an A!
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    Thanks


    Stage the reagents and conditions needed for going from 3-chloropropan-1-ol to 3-aminopropan-1-ol (3)
    ( excess) NH3, ethanol? is it gently heated or something?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    ( excess) NH3, ethanol? is it gently heated or something?
    yes well done!


    Give 2 uses of polyesters (2)
    Offline

    2
    ReputationRep:
    (Original post by AishaTara)
    got a feeling its going to be a killer paper :/
    the jan f325 was quite hardcompared to previous f325 papers, so the f324 so be a little easier than previous, and dont forget, about the extra time, which might mean everything gets harder?
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    yes well done!


    Give 2 uses of polyesters (2)
    clothes, plastics

    1) what is the structural formula of a lactic acid monomer
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    clothes, plastics

    1) what is the structural formula of a lactic acid monomer
    clothes is correct, not sure about plastics, I would put carpets.


    2-hydroxpropanoic acid

    HOCH(CH3)COOH
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    clothes is correct, not sure about plastics, I would put carpets.


    2-hydroxpropanoic acid

    HOCH(CH3)COOH
    conditions/reagents for hydrolysis of
    1)polypeptides
    2) polyesters
    3)polyamides
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    conditions/reagents for hydrolysis of
    1)polypeptides
    2) polyesters
    3)polyamides
    hydrolysis of polypeptides, conditions , add HCL(aq) and heat under reflux for24 hours 6 mol dm-3, also alternatively under alkaline conditions usually with NaOH(aq)


    Hydrolysis of polyesters, addition of h2o/H+ , heat under reflux , alkaline conditions


    hydrolysis of polyamides, addition of aqueous HCL/ H2O and heat under reflux or again under alkaline conditions
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    hydrolysis of polypeptides, conditions , add HCL(aq) and heat under reflux for24 hours 6 mol dm-3, also alternatively under alkaline conditions usually with NaOH(aq)


    Hydrolysis of polyesters, addition of h2o/H+ , heat under reflux , alkaline conditions


    hydrolysis of polyamides, addition of aqueous HCL/ H2O and heat under reflux or again under alkaline conditions

    correct, all of them can be done in acid or alkali conditions, water needs to be present always, water solvent
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    correct, all of them can be done in acid or alkali conditions, water needs to be present always, water solvent
    thanks

    Define:zwitterion


    Define:isoelectric point
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    thanks

    Define:zwitterion


    Define:isoelectric point

    dipolar ionic form of an alpha amino acid, contains both positive and negative charges which cancel out leaving no overall charge,

    the pH level where the zwitterion exists
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    dipolar ionic form of an alpha amino acid, contains both positive and negative charges which cancel out leaving no overall charge,

    the pH level where the zwitterion exists
    yep, very nice!


    my turn
    Offline

    2
    ReputationRep:
    (Original post by otrivine)
    yep, very nice!


    my turn

    whats the name of a fatty acid which is represented as 6:1(3) ?
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Zzzyax)
    whats the name of a fatty acid which is represented as 6:1(3) ?
    ok my method

    6=number of carbon atoms
    1= number of double bonds
    3=is the the position of double bond

    therefore,

    hexan-3-oic acid
 
 
 
Poll
Which web browser do you use?

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.