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  1. T

    Mathematics: Post your doubts here!

    I need topic wise past papers for Pure 3 and Statistics 1. I kept looking everywhere but I couldnt find anything. I hope someone could help!!
  2. T

    Physics: Post your doubts here!

    Q.P http://maxpapers.com/wp-content/uploads/2012/11/9702_w12_qp_13.pdf M.S http://maxpapers.com/wp-content/uploads/2012/11/9702_w12_ms_13.pdf Can someone please explain Q 25? And for Q 38, I get how gamma radiation will not be stopped by a few millimeters of lead, but inst alpha radiation...
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    Chemistry: Post your doubts here!

    Heres the intermediate. As you can see the oxygen carries a negative charge and since it has a lone pair it acts as a nucleophile.
  4. T

    Physics: Post your doubts here!

    Q.P http://maxpapers.com/wp-content/uploads/2012/11/9702_s14_qp_11.pdf M.S http://maxpapers.com/wp-content/uploads/2012/11/9702_s14_ms_11.pdf Can someone please help with question 33? Why cant we say R is much greater than R(A) ??
  5. T

    Physics: Post your doubts here!

    For determining whether a collision is elastic or not? Can i look at the relative speed of approach and separation even though the masses are different? or do the masses have to be the same?
  6. T

    Physics: Post your doubts here!

    Does anyone have good notes regarding the problems and improvements for experiments?? This is for P3 practical. Thanks in Advance !
  7. T

    Mathematics: Post your doubts here!

    http://maxpapers.com/wp-content/uploads/2012/11/9709_s12_qp_41.pdf For question 7, why can't I assume that the tensions on both parts of string (BC and BA) are same? I mean the string is not attached to any point between A and C, it is only pulled by a force of 8N. Should i assume that tension...
  8. T

    Mathematics: Post your doubts here!

    Q.P: http://maxpapers.com/wp-content/uploads/2012/11/9709_s14_qp_42.pdf M.S: http://maxpapers.com/wp-content/uploads/2012/11/9709_s14_ms_42.pdf Can someone explain question 7 (iv)?? I mean i get the -T(A)-2=0.5a but i really cant get the other equation?
  9. T

    Chemistry: Post your doubts here!

    For the substitution of alchohols to form halogenoalkanes, Sulphur dichloride oxide (SOCl2) can be used as a reagent. But the problem is what are the conditions for the reaction?? I've tried searching the internet but i got nothing. Can someone please help.
  10. T

    Chemistry: Post your doubts here!

    When Magnesium burns (in Oxygen/Steam) It burns with a white flame. For the observation of the reaction, should I use this or should I say Magnesium glows?? Because books mention how Magnesium burns with a white flame while Marking scheme says Magnesium glows??
  11. T

    Mathematics: Post your doubts here!

    AM = OM - OA OM= 1/2 OX , OM= 1/2 (4i + 4j + 10k) , OM= (2i + 2j + 5k) OA= 8i AM= (2i + 2j + 5k) - (8i) = (-6i +2j + 5k) AC will simply be: ( -8i + 8j )
  12. T

    Mathematics: Post your doubts here!

    I went throught it, but im still not sure how the shape of my graph would look like?can you please draw the shape?
  13. T

    Mathematics: Post your doubts here!

    http://maxpapers.com/wp-content/uploads/2012/11/9709_w14_qp_12.pdf MS ---> http://maxpapers.com/wp-content/uploads/2012/11/9709_w14_ms_12.pdf Q11(iii) Mark scheme says there is an inflexion at ( π ) in the graph, how am i supposed to know there was an inflexion at that point??? I mean if you...
  14. T

    Chemistry: Post your doubts here!

    This is what the Hess Cycle would look like (Teacher showed it to me):
  15. T

    Chemistry: Post your doubts here!

    This is true, but this is under the circumstance where Nitrogen forms 3 bonds and Sulfur forms 2 bonds. Sulfur does form two bonds with nitrogen in the structure displayed in question and hence it does have two lone pairs of electrons like you said. But if you look at the Nitrogen it only forms...
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    Chemistry: Post your doubts here!

    THANKS A LOT ! THAT HELPED SO MUCH!!
  17. T

    Chemistry: Post your doubts here!

    Q.P: http://freeexampapers.com/A-Level/Chemistry/CIE/2013-Nov/9701_w13_qp_21.pdf M.S : http://freeexampapers.com/A-Level/Chemistry/CIE/2013-Nov/9701_w13_qp_21.pdf -In question 2b(ii) Do the isomers of the 3 Cyclic compounds represent cis-trans isomerism? If so, then how does cis-trans isomerism...
  18. T

    Chemistry: Post your doubts here!

    That helped a lot! Thank you.
  19. T

    Chemistry: Post your doubts here!

    Thanks a lot! I understood 9 and 13, but for 12 I also thought it was AlCl3 until I checked the mark sheme which gave the correct answer as MgCl2
  20. T

    Chemistry: Post your doubts here!

    http://freeexampapers.com/A-Level/Chemistry/CIE/2007-Jun/9701_s07_qp_1.pdf I need help in q) 9 , 12 and 13
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