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Chemistry: Post your doubts here!

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

  1. Emily793

    Emily793

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    for p4 chemistry what are the topics assesed?? is it all thhe topics in the syllabus or only those parts in bold or only the topics found in the pdf you sent me??
     
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  3. sweetiepie

    sweetiepie

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    all the topics in the syllabus bt that are sum notes to be learnt easily in pdf file :)
     
  4. Emily793

    Emily793

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    ok was trying to escape from all these topics... but impossible!! haha
     
  5. sweetiepie

    sweetiepie

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    hmm yeah :D
     
  6. ArthurBonZavi

    ArthurBonZavi

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    Going for Chemistry paper 4 tomorrow. Good luck to all those taking the same.
     
  7. ArthurBonZavi

    ArthurBonZavi

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    Notes in the syllabus pdf like ?
     
  8. Emily793

    Emily793

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    that file
     

    Attached Files:

    • CHM4.pdf
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  9. Emily793

    Emily793

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    Dear chemistry i hate you so much!!! each molecule of my body is shouting "Hate you chemistry"!!!
     
  10. ArthurBonZavi

    ArthurBonZavi

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    Are you giving your A-level exams tomorrow (Chemistry paper 4) ?
     
  11. Emily793

    Emily793

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    yes i am! thus the post! haha!
     
  12. ArthurBonZavi

    ArthurBonZavi

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    :Bravo:

    Good luck !
     
  13. student

    student

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    Doubt !!

    (b) explain qualitatively in terms of intermolecular forces and molecular
    size:
    (i) the conditions necessary for a gas to approach ideal behaviour
    (ii) the limitations of ideality at very high pressures and very low
    temperatures
     
  14. hassam

    hassam

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    (i) intermolecular forces shud be very weak or negligible as in most of noble gases and molecular size shud be as small as possible lioke hydrogen .....y???? cos KMT postualtes THAT molecular size is insignificant compared to volume taken by the gas.........
    ii)at high pressure molecules are forced very close together so intermolecular forces start to operate, also molecular volume now become significant compared to vol of whole gas......so this contradicts the postulates of KMT....SO gas is no more ideal or it deviates from the ideal behaviiour
     
  15. paridhi shobhana

    paridhi shobhana

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    Hi every1 !!! :) i just had doudt about the esters!!!!! for example if the coumpound is given {Ethyl Methonate} how wud write this compund !!!!!!!! :unknown: plz help !!!!! Thanks in Advance
     
  16. Dayyanah

    Dayyanah

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    see the image
     

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  17. paridhi shobhana

    paridhi shobhana

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    thanks a lot!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :)
     
  18. byhn222

    byhn222

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    can someone PLEASE help with question 1) part c) in this paper?
    http://www.xtremepapers.com/CIE/Interna ... 9_qp_5.pdf

    Would drawing a tripod with a bunsen burner below and a conical flask above, which has the solid CsNo3 in it, while the flask is connected to a Gas syringe give me the marks?
     
  19. yuliana95

    yuliana95

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  20. flashguy412

    flashguy412

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    hey guys i just needed to clear out something since the exam is less than 2 days away.

    ok so you know how in paper 2 there was structural formula related questions. where the questions ask you to write down the structural formula. ok thing is, i usually know my concepts but like my arrangement of the atoms in the structural formula turns out to be different that what is in the marking scheme. mind you, im not saying i write the wrong answer its just that, instead of (for eg): propan-1,3-di-oic acid, ill write: CO2HCH2CO2H. but in the marking scheme itll say HO2CCH2CO2H. now is my answer wrong or does it not matter at all? cos im just worried that i might lose marks this way. can someone please clear this out for me.
     
  21. OakMoon!

    OakMoon! XPC Moderator Staff Member

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    It does matter in most cases. But in some it doesn't. For example in the cases of Alcohol and Aldehydes CHO and COH is a different thing.. In this case too, you should try to write the formula in the latter way. Though, yours is fine too.
     

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