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  1. Dukula Jayasinghe

    Chemistry: Post your doubts here!

    Do u have facebooook????????????????
  2. Dukula Jayasinghe

    Chemistry: Post your doubts here!

    d dONT Man. It will be utterly useless.
  3. Dukula Jayasinghe

    Chemistry: Post your doubts here!

    Send me your whatsapp number in private. Ill draw and show u.
  4. Dukula Jayasinghe

    CHEMISTRY PAPER 34 On 31st MAY

    This is the one i guess
  5. Dukula Jayasinghe

    CHEMISTRY PAPER 34 On 31st MAY

    OVERALL, where is KI in hassan's list?
  6. Dukula Jayasinghe

    CHEMISTRY PAPER 34 On 31st MAY

    But CuSO4 will be hard. So most probably, just kinetics question, enthalpy question and the final thing ANALYSIS shit
  7. Dukula Jayasinghe

    CHEMISTRY PAPER 34 On 31st MAY

    Ok guyz. According to Hassan's picture posted, sir said 60% chance of rates , 40% chance of titration. Tyoe iodometric with CuSo4 in google Also small enthalpy might come if it is rate, but a bigger one might come if it is titration. Qualitative Analysis Notes : Mn2+ or Al3+ wont be present it...
  8. Dukula Jayasinghe

    CHEMISTRY PAPER 34 On 31st MAY

    I cannot. Its illegal. Only thing confirmed is H2O2. Al3+ and Mn2+ ions are not present 99% chance. NOT PRESENT
  9. Dukula Jayasinghe

    Ummm, I have them in a CR-book. :)

    Ummm, I have them in a CR-book. :)
  10. Dukula Jayasinghe

    Ofcourse. How to send u? I write in book? u from sri Lanka?

    Ofcourse. How to send u? I write in book? u from sri Lanka?
  11. Dukula Jayasinghe

    Um. No , I find the Motion a bit confusing.

    Um. No , I find the Motion a bit confusing.
  12. Dukula Jayasinghe

    By the way, are u good in physics ? I hate it very much.Needs help!

    By the way, are u good in physics ? I hate it very much.Needs help!
  13. Dukula Jayasinghe

    Thnx, Not much of a genius. Yeah, follow the instructions i said to u. Draw the structures...

    Thnx, Not much of a genius. Yeah, follow the instructions i said to u. Draw the structures (displayed) where appreciable.I do the organic questions first cos I am better at those, then the 30-40 questions, after that the 1-20 questions. Calculations at last!
  14. Dukula Jayasinghe

    Chemistry: Post your doubts here!

    (Q10) Moles of O2 = 300 / 24000 = 0.0125 mol Now find the mass of O2 = 0.0125 x 32 = 0.4g Emprical formulae method X : O 1g : 0.4g / 16 1g / Mr(Y) : 0.025 You know Ca, Mg, K and Na forms oxides with CaO, MgO, K2O, Na2O For Ca and Mg the same number of moles as of O2 should be present to make...
  15. Dukula Jayasinghe

    Chemistry: Post your doubts here!

    The answer is 8 kPa. This is a bit hard question. Use of PV=nRT is necessary. First calculate number of Heilium moles initialy. Use PV=nRT. PV=nRT 12 x 1000 x 5 x 0.001 = n(He) x R x T n (He) = (12 x 5) / (RT) Then calculate number of Neon moles initially. PV=nRT 6 x 1000 x 10 x 0.001 = n(Ne)...
  16. Dukula Jayasinghe

    Chemistry: Post your doubts here!

    (Q7) E=mc(Temperature change) assuming 1g ~ 1cm3 E = 100 x 4.18 x (78-20) E= 24244 J Now since propanone is limiting u take its moles into consideration here Change in enthalpy = -(E/0.025) = -969.76 KJmol-1 (Q8) Down the group, thermal stability of group II carbonates increases and solubility...
  17. Dukula Jayasinghe

    CHEMISTRY PAPER 34 On 31st MAY

    I too find it hard. Just put some values accoding to ur approximations and theoritical knowledge.Thanks
  18. Dukula Jayasinghe

    Cambridge International Examinations Topical Past Papers

    Guyz, the papers are at www.gceguide.com
  19. Dukula Jayasinghe

    Chemistry: Post your doubts here!

    Oh this one. See, now when these acids react with calcium, there are several structural formulae. So for ethanoic acid it will be (CH3COO)2Ca. This will be C4H6O4Ca. Now this doesnt match up with the answer. So 1 is incorrect. 2 & 3 are hence correct. This is not AS question. This is a higher...
  20. Dukula Jayasinghe

    Yes sir!

    Yes sir!
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