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    (Original post by MathsNerd1)
    Correct


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    Give the monomers of Kevlar and state its use (3)
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    (Original post by otrivine)
    Give the monomers of Kevlar and state its use (3)
    Benzene-1,4- diamine and benzene-1,4-dicarboxylic acid. It's used in body armour, eg bulletproof vests.


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    (Original post by MathsNerd1)
    Benzene-1,4- diamine and benzene-1,4-dicarboxylic acid. It's used in body armour, eg bulletproof vests.


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    Perfect !

    My turn

    By the way how was ur special day yesterday? did you get nice gifts
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    (Original post by otrivine)
    Perfect !

    My turn

    By the way how was ur special day yesterday? did you get nice gifts
    Thanks and it was quite nice, just a little quiet celebration was enough for me.

    Okay explain the limitations of GC and why do they combine it with MS, eg the advantages (4)


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    (Original post by MathsNerd1)
    Thanks and it was quite nice, just a little quiet celebration was enough for me.

    Okay explain the limitations of GC and why do they combine it with MS, eg the advantages (4)


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    Limitations of GC= Not all the components in the mixture are separated as some components are hidden beneath other components with a higher concentration, Components (lot) may have the same area under the peak , retention time , detection of component may be the same.

    They combine GC with MS so that it can give a more clearer and reliable result as into identify the compound/substance, this gives an accurate indication of what the mixture/component may be and has many uses such as, used in space probes, airport security, environmental analysis and for detecting drugs in atheletes
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    (Original post by otrivine)
    yes

    1) 2 carbon environments

    2) in the proton NMR you would expect a quartet (3 adjacnet hydrogen atoms) and triplet( 2 adjacent hydrogen atoms)
    Correct!
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    (Original post by otrivine)
    Limitations of GC= Not all the components in the mixture are separated as some components are hidden beneath other components with a higher concentration, Components (lot) may have the same area under the peak , retention time , detection of component may be the same.

    They combine GC with MS so that it can give a more clearer and reliable result as into identify the compound/substance, this gives an accurate indication of what the mixture/component may be and has many uses such as, used in space probes, airport security, environmental analysis and for detecting drugs in atheletes
    Correct.


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    (Original post by reneetaylor)
    Correct!
    thanks


    Describe how a GC-MS is used (4)
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    (Original post by MathsNerd1)
    Correct.


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    I am starting to hate Chromatography!!


    Give the substance used for liquid stationary phase in TLC and define mobile phase (3)
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    (Original post by otrivine)
    thanks


    Describe how a GC-MS is used (4)
    I'm going to but in on this one...
    Spoiler:
    Show
    1. The GS is able to separate the components of a substance
    2. The Mass Spec is able to positively identify the substance through the molecular ion peak which tells you the mass number
    3. Together you can positively identify a compound


    Have a missed anything?

    My question is what happens if you change the conditions of a fuel cell? (oops just realised this is unit 5 but answer anyway)
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    (Original post by master y)
    I'm going to but in on this one...
    Spoiler:
    Show
    1. The GS is able to separate the components of a substance
    2. The Mass Spec is able to positively identify the substance through the molecular ion peak which tells you the mass number
    3. Together you can positively identify a compound


    Have a missed anything?

    My question is what happens if you change the conditions of a fuel cell?
    3/4 good, but mention that you are comparing the values using a spectral data base!

    my turn
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    (Original post by otrivine)
    I am starting to hate Chromatography!!


    Give the substance used for liquid stationary phase in TLC and define mobile phase (3)
    Isn't it just a solvent? And isn't it the phase that moves in chromatography?


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    (Original post by otrivine)
    thanks


    Describe how a GC-MS is used (4)
    A GC-MS consists of gas chromotography and mass spectometry, which are two types of analytical techniques.

    Gas chromotography splits the sample into constituent components
    Mass spectometry splits molecules according to mass and allows them to be presented on a data sheet for comparison.

    GC-MS can be used in space, on analysing substances found on planets
    GC-MS can be used in measuring pollution levels, for example measuring substances found in water
    GC-MS can be used for forensics, to analyse DNA found at a crime scene
    GC-MS can be used for drug testing, for example in sports, to see whether substances which will increase athletic ability in competitive games.
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    (Original post by otrivine)
    3/4 good, but mention that you are comparing the values using a spectral data base!

    my turn
    What is the difference between proteins and polyamides?
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    (Original post by otrivine)
    3/4 good, but mention that you are comparing the values using a spectral data base!

    my turn
    difference between the interaction of the molecules (in terms of bonding) with a solid stationary phase and a liquid stationary phase.
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    (Original post by master y)
    What is the difference between proteins and polyamides?

    Proteins , are made of monomers of amino acid

    Proteins have different variable (R) group

    Polyamides is a condensation polymerisation reaction in which consists of 2 diamine and 2 carboxylic acid.

    Polyamides is an amide linkage and proteins are formed from monomers of amino acid by condensation and a peptide bond is formed between amino acids.
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    (Original post by reneetaylor)
    A GC-MS consists of gas chromotography and mass spectometry, which are two types of analytical techniques.

    Gas chromotography splits the sample into constituent components
    Mass spectometry splits molecules according to mass and allows them to be presented on a data sheet for comparison.

    GC-MS can be used in space, on analysing substances found on planets
    GC-MS can be used in measuring pollution levels, for example measuring substances found in water
    GC-MS can be used for forensics, to analyse DNA found at a crime scene
    GC-MS can be used for drug testing, for example in sports, to see whether substances which will increase athletic ability in competitive games.
    yes , your examples secured the majority of marks, 4/4
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    (Original post by reneetaylor)
    difference between the interaction of the molecules (in terms of bonding) with a solid stationary phase and a liquid stationary phase.
    correct

    my turn
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    (Original post by otrivine)
    Proteins , are made of monomers of amino acid

    Proteins have different variable (R) group

    Polyamides is a condensation polymerisation reaction in which consists of 2 diamine and 2 carboxylic acid.

    Polyamides is an amide linkage and proteins are formed from monomers of amino acid by condensation and a peptide bond is formed between amino acids.
    spot on! how do you know this stuff so well.... TELL US YOUR SECRETS! :P
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    (Original post by master y)
    spot on! how do you know this stuff so well.... TELL US YOUR SECRETS! :P


    I finished revision and just doing papers, like legacy

    Define Rf
 
 
 
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