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  1. S

    Chemistry: Post your doubts here!

    this question is from the AS and A level chemistry coursebook..could someone explain why is the answer B? Which one of the following reactions is accompanied by the largest percentage increase in volume? A 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) B 2NH3(g) → N2(g) + 3H2(g) C CH4(g) + 2O2(g) →...
  2. S

    Chemistry: Post your doubts here!

    guys i really need help with Kc and Kp calculations.. any good notes for that?
  3. S

    A2 Physics | Post your doubts here

    in Q 11 b(ii)..how do we calculate the frequency of the information signal? http://www.xtremepapers.com/papers/...nd AS Level/Physics (9702)/9702_w09_qp_42.pdf
  4. S

    A2 Physics | Post your doubts here

    umm so basically we take resistance of P(red one) to compare it with the other 2 resistors? had there been a thermistor in place of one of the two resistors we could have taken the pd across thermistor?
  5. S

    A2 Physics | Post your doubts here

    this question is from the cie coursebook..please explain b (ii) A strain gauge contains 15 cm of wire of resistivity 5.0 × 10−7 Ω m. The resistance of the strain gauge is 150 Ω. i Calculate the cross-sectional area of the wire in the strain gauge. [2] ii Calculate the increase in resistance...
  6. S

    A2 Physics | Post your doubts here

    in Q10..for V-.. why do we divide 2000 by 4100.. why not the resistance of the thermistor .ie 2100 divded by 4100? http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w09_qp_41.pdf
  7. S

    Physics: Post your doubts here!

    in Q 11 b(ii)..how do we calculate the frequency of the information signal? http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w09_qp_42.pdf
  8. S

    A2 Physics | Post your doubts here

    haha right! now i get it.. thanks :D
  9. S

    Physics: Post your doubts here!

    there is Q11 a (ii) :S June 08 paper 4. http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s08_qp_4.pdf
  10. S

    A2 Physics | Post your doubts here

    i have a query in Q 12 b (ii). see to get the total no of amplifiers we divide 125 by 6. that gives us 20.8 which should be rounded off to 21 hence total gain should be 21 x 23.. in the marking scheme they hav rounded it off to 20 thus a huge difference in the answers. is there any explanation...
  11. S

    Physics: Post your doubts here!

    also, 11 a (ii) of this paper http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s08_qp_4.pdf
  12. S

    Physics: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w07_qp_4.pdf Q11 a. why is a country divided into a number of cells?
  13. S

    A level Biology: Post your doubts here!

    in the application booklet..aspects of human reproduction..page 50. it says next to the picture that it is imp to be able to explain why the tubules, which are all circular in cross-section, appear a variety of different shapes. so whats the answer to it?
  14. S

    Physics: Post your doubts here!

    Q8 iii and 10..can someone draw tthe graph for me please? http://www.xtremepapers.com/papers/...and AS Level/Physics (9702)/9702_s07_qp_4.pdf
  15. S

    Physics: Post your doubts here!

    can someone please explain Q8 iii http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s07_qp_4.pdf
  16. S

    A level Biology: Post your doubts here!

    in the application booklet..aspects of human reproduction..page 50. it says next to the picture that it is imp to be able to explain why the tubules, which are all circular in cross-section, appear a variety of different shapes. so whats the answer to it?
  17. S

    Chemistry: Post your doubts here!

    okay thanks.. if we just write alcohol will it be marked as a wrong asnwer?
  18. S

    Chemistry: Post your doubts here!

    Q4 b. how is it secondary alcohol as mentioned in the marking scheme? OH is on the 4th carbon atom.. is it because the c atom with OH is joined to 2 other c-atoms? http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_23.pdf
  19. S

    Chemistry: Post your doubts here!

    oh okay. thanks a lot! :)
  20. S

    Chemistry: Post your doubts here!

    haha so does your answer match with the marking scheme? :p coming back to the question.. i really dont get it. could you please explain why have they taken 0.04 for the acid and alcohol.their equilibrium moles should be 0.06.?
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