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  1. J

    Mathematics: Post your doubts here!

  2. J

    Mathematics: Post your doubts here!

    Thx for ur help!! Appreciate it very much^^ Hmmm...on/9709/2008/03 question 8 and mj/9709/2008/03 quest8 too..:((
  3. J

    Mathematics: Post your doubts here!

    Help:( May /June 2010/31 question 4.and m/j/2010/32 question 10..thx!!!
  4. J

    Chemistry: Post your doubts here!

    Sulfur dioxide, SO2 , is added to wines to prevent oxidation of ethanol by air. To determine the amount of SO2, a sample of wine is titrated with iodine, I2. In this reaction, one mole of SO2 is oxidised by one mole of I2. What is the change in oxidation number of sulfur in this reaction? A...
  5. J

    Chemistry: Post your doubts here!

    2 Equations involving four enthalpy changes are shown. Na(g) → Na+(g) + e– Na(g) → Na2+(g) + 2e– Na(s) → Na(g) Na(s) → Na2+(g) + 2e– ∆H= W ∆H = X ∆H = Y ∆H = Z What is the second ionisation energy of sodium?A 2W B X – W C Y – W D Z – Y help:((
  6. J

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_12.pdf Question 6 :why does x will higher?? Q10....thx very much!
  7. J

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_12.pdf Question 31...can anyone explain why 2 is not the answer...?
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