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    (Original post by Gulzar)
    Sure thing (have u not revised the first bit? )

    What is a zwitter ion and explain the isolectric point of an amino acid?
    I am using a weird technique, I find that reading from the first page to the end is boring and makes me want to sleep, so to make revision weird and interesting , I read staff from the end to the first page, it actually works better for me


    Zwitterion is a dipolar ionic form of an amino acid by the donation of a hydrogen ion from the carboxyl group to the amino group and both charges are present which results in the overall charge cancelling each other out. Isoelectric point is a point in a PH in which the amino acid exists as a zwitterion.
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    (Original post by kevloui)
    Yea thats great! I havent covered the whole module yet, so I dont know about MMR and stuff, but anything before.
    ok , how did you do in F325, I am going to do it again, I was only 3% off an A!


    Describe two methods on how to make ester and give three main uses of ester (6)
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    (Original post by otrivine)
    I am using a weird technique, I find that reading from the first page to the end is boring and makes me want to sleep, so to make revision weird and interesting , I read staff from the end to the first page, it actually works better for me


    Zwitterion is a dipolar ionic form of an amino acid by the donation of a hydrogen ion from the carboxyl group to the amino group and both charges are present which results in the overall charge cancelling each other out. Isoelectric point is a point in a PH in which the amino acid exists as a zwitterion.
    Seems to be working CORRECT

    My go
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    (Original post by Gulzar)
    Seems to be working CORRECT

    My go
    hahaha , thanks

    Give one use of benzyl ethanoate and state the functional group (2)
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    (Original post by otrivine)
    hahaha , thanks

    Give one use of benzyl ethanoate and state the functional group (2)
    Im afraid I dont know a use (polymer building maybe)

    The funstional group is an ester attached on the benzene ring.
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    (Original post by Gulzar)
    Im afraid I dont know a use (polymer building maybe)

    The funstional group is an ester attached on the benzene ring.
    good!

    An example of the use could be ,perfumes.

    My turn .
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    (Original post by otrivine)
    good!

    An example of the use could be ,perfumes.

    My turn .
    Give the reaction that forms Kevlar. Include the reactants and the name of this type of polymerisation.
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    (Original post by Gulzar)
    Give the reaction that forms Kevlar. Include the reactants and the name of this type of polymerisation.
    Kevlar = is a polyamide and undergoes Condensation polymerisation.

    The reactants involved are:-

    Benzene-1,4-diamine + Benzene-1,4-dicarboxylic acid

    As a result of condensation(removal of water) the two compounds join together to form a long repeat unit and forms kevlar used in bulletproof vests for example.
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    (Original post by otrivine)
    Kevlar = is a polyamide and undergoes Condensation polymerisation.

    The reactants involved are:-

    Benzene-1,4-diamine + Benzene-1,4-dicarboxylic acid

    As a result of condensation(removal of water) the two compounds join together to form a long repeat unit and forms kevlar used in bulletproof vests for example.
    Yep and the formula for the amount of water produced for n reactants is
    2(n-1) WELL DONE
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    (Original post by otrivine)
    Kevlar = is a polyamide and undergoes Condensation polymerisation.

    The reactants involved are:-

    Benzene-1,4-diamine + Benzene-1,4-dicarboxylic acid

    As a result of condensation(removal of water) the two compounds join together to form a long repeat unit and forms kevlar used in bulletproof vests for example.
    Can I ask for your advice please before we continue revision.
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    (Original post by Gulzar)
    Yep and the formula for the amount of water produced for n reactants is
    2(n-1) WELL DONE
    Yes , I did not get that formula? how do we use it?

    Thanks for reminding me about that!

    Define: esterification
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    (Original post by Gulzar)
    Can I ask for your advice please before we continue revision.
    of course !
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    (Original post by otrivine)
    of course !
    I have 246 UMS in my AS chemistry...so 6 up off the A grade.
    Im not doing too well in my practicals for A2
    Do u think I have a chance of getting the A grade in the summer.
    Im ressitting f324 (got a U) and taking f325 as well.
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    (Original post by Gulzar)
    I have 246 UMS in my AS chemistry...so 6 up off the A grade.
    Im not doing too well in my practicals for A2
    Do u think I have a chance of getting the A grade in the summer.
    Im ressitting f324 (got a U) and taking f325 as well.
    What do you have for your practicals so far?

    What is your total UMS for AS+practical for A2?
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    (Original post by otrivine)
    What do you have for your practicals so far?

    What is your total UMS for AS+practical for A2?
    qual- 7/10
    quant 14/15
    eval 7-15 (retaking...its electrode potentials next week :O
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    (Original post by Gulzar)
    qual- 7/10
    quant 14/15
    eval 7-15 (retaking...its electrode potentials next week :O
    lets say 35ums you have for your A2 practicals with these marks.

    so

    246+35= 281 ums

    so you currently hold 281ums and you would need an extra 199 UMS marks to get an A, essentially, if you have to get high A in both F325 and F324 to get an A! My suggestion, is try to push the evalutative to 15/15 and then you would only need to get an A on one paper and a B on the other.
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    (Original post by otrivine)
    lets say 35ums you have for your A2 practicals with these marks.

    so

    246+35= 281 ums

    so you currently hold 281ums and you would need an extra 199 UMS marks to get an A, essentially, if you have to get high A in both F325 and F324 to get an A! My suggestion, is try to push the evalutative to 15/15 and then you would only need to get an A on one paper and a B on the other.
    Oh I wish I could get 15/15
    Ok thanks, Ill try.
    esterification is when an alcohol reacts with a carboxylic acid to produce an ester...with the elimination of a water molecule for every 1:1 ratio of alcohol and carboxylic acid reacting.
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    (Original post by Gulzar)
    Oh I wish I could get 15/15
    Ok thanks, Ill try.
    esterification is when an alcohol reacts with a carboxylic acid to produce an ester...with the elimination of a water molecule for every 1:1 ratio of alcohol and carboxylic acid reacting.
    I am sure you will do it! Keep at it, I wish I could help but I did all my practicals last year so they changed it this year.

    Correct, my turn
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    (Original post by otrivine)
    I am sure you will do it! Keep at it, I wish I could help but I did all my practicals last year so they changed it this year.

    Correct, my turn
    State what molecular conditions are needed for a molecule to hold a stereoisomeric property?

    Btw will it be too hard to get high A's in both papers?
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    (Original post by Gulzar)
    State what molecular conditions are needed for a molecule to hold a stereoisomeric property?

    Btw will it be too hard to get high A's in both papers?
    is it that there should be restricted rotation of (around) the carbon -carbon double bond and that each carbon atom must be attached to four different atoms or groups of atom, also a double bond must be present. Also, there are two types of stereoisomers , E-Z (cis/trans).


    I dont think it should be hard, but you have to work hard. This is all subject to difficulty of paper.
 
 
 
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