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  1. papajohn

    Physics: Post your doubts here!

    1a) Path difference (S2M-S1M) b/w the waves from Si amd S2 is an odd number ( 1 3 5...) multiple of half wavelenght 2) Same amplitude at M The part b is indeed the most difficult question in the history of CIE ;) B) Distance S2M =128 (from Pythagoras thereom) Path difference S2M - S1M...
  2. papajohn

    When is your Chemistry paper 1. Mine is in 10 June. Plenty of time :-).

    When is your Chemistry paper 1. Mine is in 10 June. Plenty of time :-).
  3. papajohn

    Chemistry: Post your doubts here!

  4. papajohn

    Chemistry: Post your doubts here!

    Alkanes are fuel .
  5. papajohn

    Chemistry: Post your doubts here!

    O/N_2004_P1 -- Q9 A is incorrect because there is hydrogen bond exist in alocohol and is stable. The carboxylic and ketoes in options C and D are liquid because of intereating involving induces dipoles. We left with the alkane gas and if you remember, it is only reaction they are good at. Q12...
  6. papajohn

    Chemistry: Post your doubts here!

    Since it was partial oxidation of the primary alcohol, the aldehyde was produced. Number of moles of ethanol: 2.30/46 is 0.05 One mole of ethanol produce 1 mole of aldehyde CH3CHO The theoretical mass of the aldehyde will be 0.05*44 is 2.2 g The actual mass produce is 70%.
  7. papajohn

    Chemistry: Post your doubts here!

    Q10, Correct me if i m wrong The enthalpy of atomisation is just converting the substance to the atom of gaseous state.. For example C(s)------> C(g) For Hydrogen H2(g)----> 2H(g) To find the CH bond we need to draw the Hess law ...
  8. papajohn

    Chemistry: Post your doubts here!

    I misread it :). I hope not to do in CIE exam
  9. papajohn

    Sense of humor :-)..

    Sense of humor :-)..
    • papajohn
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  10. papajohn

    Dont call me Eygyptian,they buried their mummies :-(

    Dont call me Eygyptian,they buried their mummies :-(
    • papajohn
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  11. papajohn

    Thats ma nigga style :-) noffin just simply meaning `No`

    Thats ma nigga style :-) noffin just simply meaning `No`
    • papajohn
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  12. papajohn

    Nay

    Nay
    • papajohn
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  13. papajohn

    Thanks for your valuable contribution :-)

    Thanks for your valuable contribution :-)
    • papajohn
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  14. papajohn

    Currently Listening To?

    Can someone please help me to increase my likes to 100 :).. 3 likes to go.:)
  15. papajohn

    You are applying to Nust on the basis of the the SAT. That good.

    You are applying to Nust on the basis of the the SAT. That good.
  16. papajohn

    Chemistry: Post your doubts here!

    I had a question in my head about the chemistry practical of titration. The problem is that i performed the experiment and there is huge fluctuation i.e 19 cm3 and 25 cm3. The teacher told me that it should be correct to 0.1 cm3. The problem is that why there is great difference b/w my result. I...
  17. papajohn

    XPC Confession

    Somebuddy remenber me??:whistle:
  18. papajohn

    Physics: Post your doubts here!

    Question 7 part b...Please help usama321 and others. http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w05_qp_2.pdf
  19. papajohn

    Physics: Post your doubts here!

    Please can anyone solve me the question of Pacific book Volume 2 self evaluation 10.7 page no 278 Q:3. I tried very hard but cant solve it. Even the electrical engineer whom i give to solve cant solve it.
  20. papajohn

    Physics: Post your doubts here!

    For physics and chemistry, How many correct to significant figure do we have write answer?
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