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  1. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s13_qp_12.pdf Number 40?? Answer is D Anyone?? Please??
  2. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s13_qp_12.pdf Number 40?? Answer is D
  3. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w09_qp_12.pdf Number 20? answer is A how do u know the number of carbon double bonds?
  4. Youssef Tawil

    Chemistry: Post your doubts here!

    you did something wrong , the equation of reaction is PbCl4 +2NaBr--> Pbcl2+Br2+ 2NaCl. moles of PbCl4 is 6.98/349= 0.02 1:1 ratio = 0.02 mole of Br2 multiply 0.02 by mr of Br2 = 0.02X(79.9+79.9)= 3.196
  5. Youssef Tawil

    Chemistry: Post your doubts here!

    A carbocation is the intermediate , it is electrophilic addition of alkenes and the intermediate is carbocation. C is wrong as it is free radical substitution of alkanes, B is wrong as it is nucleophilic substitution of primary halogenoalkane so it is SN2 (no formation of carbocation)
  6. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w08_qp_1.pdf Number 30?? answer is C ?? Please anyone???
  7. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w10_qp_12.pdf Number 8 ?? Answer D . If u can do this and explain it ur a genius! Hardest question! Please anyone explain it
  8. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_s12_qp_11.pdf Number 40 , answer is D why is 2nd statement incorrect?
  9. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s12_qp_11.pdf Number 40 , answer is D why is 2nd statement incorrect?
  10. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w13_qp_13.pdf Number 3 ?? Answer is B Number 10?? Answer is A
  11. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w12_qp_12.pdf Number 11?? Anyone?? Answer is A how???
  12. Youssef Tawil

    Chemistry: Post your doubts here!

    Anyone please explain these
  13. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w11_qp_13.pdf Number 12 ?? answer is D
  14. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s12_qp_12.pdf Number 28????? answer is C
  15. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_12.pdf Number 11 ?? anyone please??? Answer is C
  16. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s06_qp_1.pdf Number 10??? answer is 4/3 how????
  17. Youssef Tawil

    Chemistry: Post your doubts here!

    JUNE 2007 PAPER 1 NUMBER 9????
  18. Youssef Tawil

    Chemistry: Post your doubts here!

    n Q8: you know B and C are wrong because they contain a OH group so will form hydrogen bonds, A is also wrong as NH2 can form hydrogen bonds leaving D which is the correct answer Q19: it asks for a transition element COMPOUND so it is vanadium pentoxide which is used in the contact process...
  19. Youssef Tawil

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w11_qp_12.pdf Number 26 , Answer A Anyone? please?
  20. Youssef Tawil

    Chemistry: Post your doubts here!

    when you add NaOH to a ester , you get a carboxilate salt and alcohol. step 1: You break the ester linkage step 2: write the alcohol and carboxylic acid step 3: remove H from carboxylic acid and add Na so you get a alcohol and the carboxilate salt Therefore answer is B
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