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  1. A

    Chem 11

    wasn't it option A?
  2. A

    Chem 11

    it was 24 with october/november 2010 paper 12. WE HAVE A CHANCE.
  3. A

    need serious help with chem!! :/

    Guessing will get you no where. This is how you solve it: The ratio of the volumes is 5:10, so what you do is, (5/15 *12) + (10/15*6) = 8. The answer is A.
  4. A

    Chemistry: Post your doubts here!

    For Q8, The graph plotted for pressure against volume always looks something like this http://www.chemistryexplained.com/images/chfa_02_img0350.jpgPressure is inversely proportional to volume. The answer is D, which shows that volume is directly proportional to temperature (when p is constant...
  5. A

    A level Biology: Post your doubts here!

    The nitrogenous base uracil replaces thyamine in RNA, right? So when uracil is 25, thyamine will be 0. Now we know that option C is thyamine. In DNA, thyamine bonds with adenine. So the percentages of thyamine present has to be very close to adenine. The closest numbers are in B. So the answer is B.
  6. A

    Chemistry: Post your doubts here!

    heyy everyone http://www.xtremepapers.com/CIE/International A And AS Level/9701 - Chemistry/9701_s11_qp_12.pdf questions 17, 22 and 29. for question 29 i get how 2 new chiral carbon atoms are added on creating the diol but how is one chiral atom removed with hot, acidified KMnO4?
  7. A

    Mathematics: Post your doubts here!

    Re: Maths help available here!!! Stuck somewhere?? Ask here! i just started studying for math as so my question might kinda be stupid lol in may/june 2010 question 7 i understand the question and the differenciation part and everything what i dont understand is why the equation is multiplied by...
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