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Chemistry: Post your doubts here!

Discussion in 'International A And AS Level' started by XPFMember, Sep 29, 2011.

  1. nerdybookworm

    nerdybookworm

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    anyone here gave wch01 edexcel AS chem yesterday????
     
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  3. i_try9621

    i_try9621

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    Anyone gave CIE P3 practical yesterday?
     
  4. auxy12

    auxy12

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    upload_2017-10-14_17-53-8.png
    CAN ANYONE EXPLAIN HOW TO GET X AND Y?
     
  5. Bishnu Dev

    Bishnu Dev

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    First find out the volume of CO2 which is formed by the combustion....
    volume of CO2 = 170-110 = 60 cm3

    X = volume of CO2 / Volume of Alcohol
    X = 60 / 20 = 3

    Now find volume of water
    Volume of Water = 250 - 170 = 80 cm3
    Y / 2 = Volume of H2O / Volume of Alcohol
    Y / 2 = 80 / 20 = 4
    So Y = 8
     
  6. i_try9621

    i_try9621

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    Anyone please help me with V and W ? Shouldn't Oxygen be replace with O-H bond ? Capture_3.JPG Capture_3.JPG
     
  7. i_try9621

    i_try9621

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    Capture_3.JPG Someone help me with this please? I have a problem with understanding what test 1 and test 5 is for . Also which test is for Amine and Amide here?
     
  8. Thought blocker

    Thought blocker

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  9. i_try9621

    i_try9621

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    I mean from C=O bond to C-OH bond or Am I wrong?
     
  10. i_try9621

    i_try9621

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    I think I found my mistake in there . Just to clarify, this is reduction of Amide to Amine yes?
     
  11. i_try9621

    i_try9621

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    Anyone help me with the questions please?
     
  12. Daniel Jeng

    Daniel Jeng

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    In this question test 1 is for the basic identification of whether the substance is an amide or amine. Since M does not react with the acid, this means that the substance must contain an amide group (it is neutral). Since the only other group we know containing nitrogen is amine, and it would react with the acid, we can safely assume the other substances all contain an amine group. In terms of test 5, it can test for either a hydroxy group, an acid, nucleophilic substitution or hydrolysis. remember that either an acid or an alkali can be used in hydrolysis. For the reaction with M, you should be able to see that the amide has hydrolysed into phenylamine and sodium propanoate.

    EDIT: My bad, this is for the second question
     
  13. RJ72NL

    RJ72NL

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    Anyone doing Chemistry Practical 34 on the 17th October??? Pls help if possible✌
     
  14. Bishnu Dev

    Bishnu Dev

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    It's on 25th October... It's Paper 2 tomorrow
     
  15. Bishnu Dev

    Bishnu Dev

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    I am also waiting for any help possible on Paper 34
     
  16. RJ72NL

    RJ72NL

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    Yes, sorry...my bad.... Anyone?
     
  17. i_try9621

    i_try9621

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    Thanks for that
     

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