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  1. J

    How was Chemistry 42?

    i think there were 4-5 chirals..
  2. J

    How was Chemistry 42?

    Actually i have an idea on the buffer question..i didnt manage to solve it there but im guessing we had to get H+ conc from pH, then use Ka to find conc. of acid for that H+, then use the conc. of acid given to derive the volume needed of the solution, then add the remainder with salt solution...
  3. J

    AS BIOLOGY P-33

    That is what i did, and my result was coming with S1, wth :/
  4. J

    How was Chemistry 42?

    go to the paper compiled by xtreme and check for "gt" for each year attachment.
  5. J

    How was Chemistry 42?

    h2s04 and hno4 both conc. heat to 55 for alkylbenzene hno3 dilute RTP for phenol
  6. J

    How was Chemistry 42?

    i cant recall whether he was asking about the cross links or polymer...but if it was addition how come he never showed us any double bonds :/
  7. J

    How was Chemistry 42?

    condensation. He gave it away by saying small molecule is formed [which is h20 btw]
  8. J

    AS BIOLOGY P-33

    whoever made the p33 guess i love you man :) and is there going to be a guess paper for chemistry and physics? also, what did you guys get, did it hydrolyze starch or sucrose? mine hydrolyzed sucrose :/
  9. J

    How was Chemistry 42?

    idk if light blue ppt is important to list or not, but since it was aqeous an intermediate of Cu[h2o]2[nh3]4 would be formed.... also the split happens because of dz2 and dx2-y2 which are close to bonding pairs causing them to go to higher energy level, whereas these orbitals are not present...
  10. J

    How was Chemistry 42?

    with NH3 the copper solution would go from light blue to light blue ppt to deep blue solution
  11. J

    How was Chemistry 42?

    idk if it couldve been arene...arene with OH attached would've gone far off deshielded to 9-10 PPM? :/ Khair im sure mine isnt right either so chill hi hai :p With cold NAOH only the COOH would react, with hot NAOH COOH and 2 benzene OH would react and hydrolysis also.
  12. J

    Chemistry: Post your doubts here!

    usually 3, unless specified otherwise
  13. J

    AS Biology paper 22 May 13th 2013

    I highly doubt the grade threshold will EVER come up to 50. Maximum 43, IMHO.
  14. J

    A level Biology: Post your doubts here!

    Hey guys in this paper http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Biology%20%289700%29/9700_s07_qp_4.pdf could someone please help me out with 8b part II? and also tell me what vertical and horizontal transmissions are?
  15. J

    Chemistry Paper 4-theory- doubts =D

    I would like to add a little point to that: the reason they split the D-orbitals in such a way is that Dx Dy Dz are not on the line whereas Dx2y2 and Dz2 are. On the line meaning they are directly in the way of the ligand and transition elements bond, whereas the others are not. :P
  16. J

    Chemistry Paper 4-theory- doubts =D

    Well its basically that sometimes second electron affinity can be positive, sometime it can be negative, it just depends on the compound AFAIR :P
  17. J

    Chemistry Paper 4-theory- doubts =D

    Not always the case, its just a possibility.
  18. J

    Important Question: Physics P4

    I honestly don't think that much AS knowledge is applied for physics and biology, maybe chemistry with organic and physical, but thats about it :/ ofcourse really core concepts like speed acceleration etc are important but EVERYONE knows those...
  19. J

    AS Practical Paper 34 - Apparatus?

    Oh yes ofcourse :O I will ask my teachers about it too :P And i hope you're right about no electricity coming up in physics, thats usually the trickiest ones they give!
  20. J

    Chemistry: Post your doubts here!

    You just saved me from a world of worry my friend :P
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