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    On any of the unit 3 chem past papers, were there any questions or parts related to theory? If there were can someone please post the topics? I was doing the jan 2011 paper and there was a question on kinetics collision theory.

    I thought this ppr only tested practical knowledge...

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    (Original post by Relaxedexams)
    On any of the unit 3 chem past papers, were there any questions or parts related to theory? If there were can someone please post the topics? I was doing the jan 2011 paper and there was a question on kinetics collision theory.

    I thought this ppr only tested practical knowledge...

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    There is no need to worry. Actually in that question the answer was obvious. More area mean more rate of reaction.

    But yeah you are right. They might put in a question from theory. Nothing to do but at least attempt it
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    (Original post by NilFBosh)
    There is no need to worry. Actually in that question the answer was obvious. More area mean more rate of reaction.

    But yeah you are right. They might put in a question from theory. Nothing to do but at least attempt it
    Yea, I'm hoping that the paper has a lot of calculations and a titration question. Hopefully, nothing from IR spectra
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    (Original post by Relaxedexams)
    Yea, I'm hoping that the paper has a lot of calculations and a titration question. Hopefully, nothing from IR spectra
    IR spectra is easy. A range of peaks like for alcohol and aldehydes will be given. The question might be show that the compound is an alcohol. So in the graph search for the peaks and cross check with the range given for alcohol. Other follow up questions are on organic


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    (Original post by NilFBosh)
    IR spectra is easy. A range of peaks like for alcohol and aldehydes will be given. The question might be show that the compound is an alcohol. So in the graph search for the peaks and cross check with the range given for alcohol. Other follow up questions are on organic


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    Thanks a lot man. That sounds ok :-D
    I was expecting drawing the graph and stuff ( don't even know if that is in the spec)

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    (Original post by Relaxedexams)
    Thanks a lot man. That sounds ok :-D
    I was expecting drawing the graph and stuff ( don't even know if that is in the spec)

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    No drawing graphs in IR.
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    In a seperating funnel where will d more dense solution be and why.
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    (Original post by Anujan Murugesu)
    In a seperating funnel where will d more dense solution be and why.
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    Didn't see any question abt separating funnels in any pastpaper.

    But to answer ur question more dense solution will be on top of the less dense solution (no pun intended)


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    (Original post by NilFBosh)
    Didn't see any question abt separating funnels in any pastpaper.

    But to answer ur question more dense solution will be on top of the less dense solution (no pun intended)


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    Check the jan 2010 ppr.

    More dense at the top? :confused:
    I put more dense at bottom which is logical but the mk schme says more dense is at the top...how is this?

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    (Original post by Relaxedexams)
    Check the jan 2010 ppr.

    More dense at the top? :confused:
    I put more dense at bottom which is logical but the mk schme says more dense is at the top...how is this?

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    Check google. On Wikipedia, in the article abt separating funnel, there was a diagram of oil on top of water. Googled for the respective densities and saw that oil was more dense and made my conclusion


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    (Original post by NilFBosh)
    Check google. On Wikipedia, in the article abt separating funnel, there was a diagram of oil on top of water. Googled for the respective densities and saw that oil was more dense and made my conclusion


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    Your conclusion is right, what is the logic behind it?

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    (Original post by Relaxedexams)
    Your conclusion is right, what is the logic behind it?

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    Not quite sure...
    Just remember more dense on top.


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    (Original post by NilFBosh)
    IR spectra is easy. A range of peaks like for alcohol and aldehydes will be given. The question might be show that the compound is an alcohol. So in the graph search for the peaks and cross check with the range given for alcohol. Other follow up questions are on organic


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    Your right. I did that question in class today and the only thing related to ir spectra was to copy an already given range

    Hope we get something like that.
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    Which practicals do you guys expect. I think:-

    -Test for ions
    -Organic (Halogenoalkane reaction)
    -Energetics
    -Maybe kinetics and ir spectra (they only asked them once)
    -Something new like mass spectral analysis?

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    (Original post by Relaxedexams)
    Which practicals do you guys expect. I think:-

    -Test for ions
    -Organic (Halogenoalkane reaction)
    -Energetics
    -Maybe kinetics and ir spectra (they only asked them once)
    -Something new like mass spectral analysis?

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    obviously gas/ions tests as first questions and some questions on organics
    Others not too sure
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    (Original post by Relaxedexams)
    Your conclusion is right, what is the logic behind it?

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    OIL is less dense than water so it floats.
    HENCE the less dense substance is on top. and the more dense is below.
    in simple words the lighter substance is on the top as the heavier substance sinks.
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    (Original post by thextractor007)
    OIL is less dense than water so it floats.
    HENCE the less dense substance is on top. and the more dense is below.
    in simple words the lighter substance is on the top as the heavier substance sinks.
    I forgot oil was less dense than water

    But check Jan 2010 paper. In the separating funnel question, the more dense liquid is at the top. How is that? :confused:

    Is it something to do with the funnel?
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    I hope kinetics is in this paper, a lot of calculations, and drawing a distillation or reflux apparatus, and graph plotting. Nothing on IR Mass spectra please!
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    (Original post by kevsamuel)
    I hope kinetics is in this paper, a lot of calculations, and drawing a distillation or reflux apparatus, and graph plotting. Nothing on IR Mass spectra please!
    We are on the same boat

    One doubt:-

    In the separating funnel, the more dense liquid is at the top. Why is that? What is the reasoning behind it? :confused:
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    (Original post by Relaxedexams)
    I forgot oil was less dense than water

    But check Jan 2010 paper. In the separating funnel question, the more dense liquid is at the top. How is that? :confused:

    Is it something to do with the funnel?


    i guess its because it says its" the aqueous layer" so maybe the alcohol was dissolved in the water- hence making the whole solution of the bottom layer denser

    BY THE WAY I CHECKED GOOGLE OIL IS NOTTT MORE DENSE THAN WATER
 
 
 
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