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  1. loveyuan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s13_qp_42.pdf i need help in 8ai >< thanks
  2. loveyuan

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_s11_qp_33.pdf question number 9iii why x is approaches to 10 instead of 20？？？？
  3. loveyuan

    Chemistry: Post your doubts here!

    Yeah completed . I have A2 exam coming soon .
  4. loveyuan

    Chemistry: Post your doubts here!

    hi , for an example http://www.cie.org.uk/images/157296-november-2012-question-paper-43.pdf question number 7 iii I can solve the 7 i and ii and from the question i know there will have 2 -CH3 group and 2-CH2 group and one of the element beside C and H is O and according to chemical shift...
  5. loveyuan

    Chemistry: Post your doubts here!

    Anyone can teach me how to use the chemical shift given in the official data booklet ? It is confusing , it is so much different from the one given in the text book .
  6. loveyuan

    Chemistry: Post your doubts here!

    Thanks :) appreciated :)
  7. loveyuan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w07_qp_4.pdf Question number 6 iii and iv anyone?? >.<
  8. loveyuan

    Mathematics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_w13_qp_32.pdf question number 4 anyone ？><
  9. loveyuan

    Mathematics: Post your doubts here!

    http://www.google.com.my/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CBsQFjAA&url=http%3A%2F%2Fwww.utm.ac.mu%2Fresource%2Fdocuments%2Fformatted%2520probability%2520and%2520statistics%2520-%2520bis.pdf&ei=ru3tU92pCdfs8AXD1YGIDg&usg=AFQjCNG7F7V8lfqolpMgSXZ9Ww4YfymVCg&bvm=bv.7323134...
  10. loveyuan

    Chemistry: Post your doubts here!

    oh~ so no need to count mass of nitrogen it is ? how about question 6 ?
  11. loveyuan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20%289701%29/9701_s08_qp_1.pdf question 2 and 6 please help T_T
  12. loveyuan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20%289701%29/9701_s08_qp_1.pdf question 2 and 6 please help T_T
  13. loveyuan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20%289701%29/9701_s08_qp_1.pdf No 39 it is statement 2 is correct ? i though only ONE chiral center formed? since another C from the alkene is already chiral
  14. loveyuan

    Chemistry: Post your doubts here!

    D6 when h2so4 added the -Coo bond ester bond break down and acid and alcohol form + col KMnO4 the double bond all gone and form 4 -OH group sodium can react with acid and alcohol . each of the acid and alcohol replace by sodium so 6 of the hydrogen atom
  15. loveyuan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w07_qp_1.pdf 9\\21(no sunlight wheyyy)\\33\\37 pleaseeeee
  16. loveyuan

    Chemistry: Post your doubts here!

    number of the mole of alcohol = 30/46 number of mole of acid = 30/60 limiting reagent is acid since its no of mole is smaller so mass of theorical yield of ester - 30/60 x 88 = 44 perecentage = 22/44 x 100% = 50%
  17. loveyuan

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20%289701%29/9701_s07_qp_1.pdf question 22 ans A . why ?!
  18. loveyuan

    Chemistry: Post your doubts here!

    they were discussing the same question at previous page ya :D
  19. loveyuan

    Chemistry: Post your doubts here!

    27 the above is COO bond so it is ester once sulfuric acid added , the ester hydrolysis to acid and alkali so the the answer will be a acid . then hydrogenation occur and all double bond gone. 29 NaCN is the catalyst for this reaction so D . 34 1 . sulfuric acid is strong acid so reaction...
  20. loveyuan

    Chemistry: Post your doubts here!

    thanks a lot :D
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