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    Organic solvents will be on top


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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?
    No. In the seperating funnel you will have water and 2-chloro-2-methylpropane from the reaction products as shown in the equation. Now 2-chloro-2-methylpropane is less dense than water so it will be at the top. AS it has a density of 0.842 while water which has a density of 1 will be at the bottom as it is more dense.
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    (Original post by NilFBosh)
    Not quite sure...
    Just remember more dense on top.


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    More dense is at the bottom
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    (Original post by Relaxedexams)
    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:
    Your statement is wrong. MORE DENSE WILL BE AT THE BOTTOM
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    Hey guys. this will come in handy.


    118138031-Edexcel-Chemistry-Unit3B-Notes.pdf
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    (Original post by thextractor007)
    No. In the seperating funnel you will have water and 2-chloro-2-methylpropane from the reaction products as shown in the equation. Now 2-chloro-2-methylpropane is less dense than water so it will be at the top. AS it has a density of 0.842 while water which has a density of 1 will be at the bottom as it is more dense.
    Thanks a lot! N the remaining alcohol dissolves in water so it stays down, or is it removed prior to using the seperating funnel.

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    (Original post by thextractor007)
    Your statement is wrong. MORE DENSE WILL BE AT THE BOTTOM
    I didn't consider water. I thought only the alcohol n halogenoalkane were in the funnel. Thaz y I was wondering y the more dense halogenoalkane was on top of the less dense alcohol. Thanks for clearing it up.

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    (Original post by maysmaysmays1)
    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
    That is what I said "I forgot oil was less dense than water"

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    (Original post by NilFBosh)
    Organic solvents will be on top


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    That is because usually in the funnel, there is water n an organic solvent. Organic solvents usually are less dense than water, so they are on top. Right?

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    OMG
    I wish my school did the 3B paper instead of doing numerous number of practicals ><
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    (Original post by nataliekwong)
    OMG
    I wish my school did the 3B paper instead of doing numerous number of practicals ><
    Are you from the UK?

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    (Original post by Relaxedexams)
    Are you from the UK?

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    Yes haha
    Now I wish I wasnt
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    Hi guys, I just cannot find the June 2012 paper for Chem Unit 3, does anyone have it ? Can you please link it if you do ? Thankss a lot!
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    (Original post by hiba_khalid)
    Hi guys, I just cannot find the June 2012 paper for Chem Unit 3, does anyone have it ? Can you please link it if you do ? Thankss a lot!
    Here u go
    http://www.edexcel.com/migrationdocu...e_20120509.pdf


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    THANK YOU SO MUCH! thankss a lot
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    Please tell me I haven't missed out.... in unit 3, what sort of questions can kinetics be on?
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    (Original post by nilfbosh)
    ir spectra is there in unit 3. It came in the jan 13 paper.
    Alcohol reactions
    halogenoalkane reactions
    im freaking out , can someone please tell me exactly whats in 3b asap??!?!?!?
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    I really wanna know whats in exactly in 3b from unit 1 and 2 plzzz
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    (Original post by Mimi85)
    I really wanna know whats in exactly in 3b from unit 1 and 2 plzzz
    The following i guess:
    Group 1 and 2-test of cations
    Group 7 and others-test of anions
    Titration calculations and sodium thiosulfate titration
    Test of saturated and unsaturated organic compounds
    Energetics-how to measure the rate of a reaction
    Reading the indicators and choosing them appropriately
    Enthalpy changes calculations i.e Hess's law
    Making halogenoalkanes from alcohols and vice versa
    Heating under reflux
    Simple distillation
    ideas on why this was added to that and why the former was cooled before adding,etc
    Drawing separating funnel and deciding which layer will be on top of which.
    Possible rate of reaction graphs.
    Specific heat capacity of solutions
    Ideas on why certain reactants are added in patches to other reactants.
    Differentiating between aldehydes and ketones with Fehling's solution

    Thats probably it
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    Name:  ImageUploadedByStudent Room1367913926.291245.jpg
Views: 213
Size:  159.3 KBCan u guys tell me why the mouth of the beaker cannot be stoppered? Thx!


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