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  1. L

    very tensed !!!!!

    Yeah I believe the standards of difficult for the exams have increased but don't be discouraged because of that. Just work hard throughout the entire year, pray and hope for the best. Besides, if it's a tough paper then maybe the GT will be lower than usual. I mean, I worked hard for Chemistry...
  2. L

    Chemistry: Post your doubts here!

    Does the addition of HCN in the presence of NaCN to an aldehyde or ketone take place under room conditions or heat under reflux? My notes say the latter but the marking schemes say the former and I'm confused..
  3. L

    GRADE IN PHYSICS p3

    For P1, it's somewhere between 28-32, usually 29 or 30 (but it depends on how easy the paper is, so if it's an easy paper it could be 32). For P2, it's about 35-40. For P3, you need about 30-32. But remember, it also depends on how easy the paper is. The minimum for an A in AS level physics is...
  4. L

    AS Chemistry P2 Prep.

    Yeah, just three lines between the C and N would be enough.
  5. L

    Chemistry: Post your doubts here!

    Why can't NaBr react with the water? I made that mistake at first too. :s
  6. L

    AS Chemistry P2 Prep.

    Yes. But be sure to show the bonds too (e.g. C-N triple bond) and chiral C atom if it's a 3 mark question.
  7. L

    Chemistry: Post your doubts here!

    I use both sometimes, but mainly grams. When I feel I am confident with working in moles, I use it. :P But yeah, I'll try to work in moles from now on.
  8. L

    Chemistry: Post your doubts here!

    Yeah there was only one MCQ (W07, P1, Q28) where you were required to know that H2 reduces a carbonyl compound. But you could have figured that out by eliminating all of the other options. Also, my teacher told me that he never told us this for P2 because the CIE wants us to quote NaBH4/LiAlH4...
  9. L

    Paper 12 maths

    I just posted all of the answers for variant 12. :P The answer to the GP was 27.
  10. L

    Chemistry: Post your doubts here!

    Yeah, it's 24 dm^3 per mole, and 1 mole of O2 is 32 g. So basically, 24 dm^3 = 32 g of oxygen at room temperature which is what I did in my calculation. I have always used grams to solve these type of questions and I never get the answer wrong.. I'd be surprised if the examiners wouldn't accept...
  11. L

    Chemistry: Post your doubts here!

    I got it. Basically, I solved the entire question using grams, and then converted grams into dm^3 in the end: H2S : O2 34.1 : 68 8.65 : x x = 12.17 g of Oxygen. g : dm^3 32 : 24 12.17 : y y = 9.13 dm^3 :)
  12. L

    How was physics paper 33

    Yes exactly, so it depends on your percentage difference between the values of k, so there is no definite answer, it just depends on your own values.
  13. L

    Chemistry: Post your doubts here!

    Thanks. I realized my (very silly) mistake, I wrote 16g for O2 instead of 32 g.
  14. L

    Paper 12 maths

    I think we should discuss S1 in some other thread, no? :P Also, here are all the answers (to my knowledge) Q1) Volume = 12 pi Q2) 0.105 Q3) a = +5 Q4) Length CD = 2.5 units. Q5) 45 and 116.6 degrees. Q6) I don't remember exactly but I think the perimeter was 45.x (or something like that) and...
  15. L

    Chemistry: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s05_qp_2.pdf Q2 (d) (iii) My volume is 18.26 dm^3 while the marking scheme's answer is 9.13 dm^3. But that's because the equation in the MS was multiplied by 2. Is this necessary, and is my...
  16. L

    How was physics paper 33

    My teacher told me that there is no specific answer to the relationship question. If the difference between your k values is < 20% and you wrote that there is no direct relationship, then you'll get full marks and vice versa. And I think the k values should have been given to 3 s.f.
  17. L

    Why was this thread closed?

    I did.. but I don't think it contained any "cheating" related stuff there.. maybe I'm wrong.
  18. L

    paper 12 chemistry ...

    I don't think anyone remembers it. :P Anyway, my paper wasn't really good by my standards, I know I've gotten at least 6 wrong (all due to silly mistakes :\) and I'm pretty sure I will get like 3 or 4 others wrong so I'm hoping to get at least 30 or 31. Hopefully P2 and P34 will be good. :|
  19. L

    can someone explain this question?

    voxxines. Your answer is right.
  20. L

    Mathematics: Post your doubts here!

    You know, the chances of your questions getting answered will sky-rocket if you post images of the questions here. :P
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