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  1. A

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s03_qp_1.pdf Question 8
  2. A

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s11_qp_13.pdf question 16 and 17
  3. A

    Chemistry: Post your doubts here!

    River water in a chalky agricultural area may contain Ca2+, Mg2+, − 2 3 CO , − 3 HCO , Cl − and − 3 NO ions. In a waterworks, such water is treated by adding a calculated quantity of calcium hydroxide. What will be precipitated following the addition of calcium hydroxide? A CaCl2 B CaCO3 C...
  4. A

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w05_qp_1.pdf Question 34
  5. A

    Chemistry: Post your doubts here!

    Thank you so much :D
  6. A

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w04_qp_1.pdf Question 10 can anyone help me please
  7. A

    Mechanics-Kinematics Questions

    particles A and B are moving along horizontal straight lines which lie in the west east direction. At a certain time, A passes a point P moving to the east with speed 5ms^-1 and constant acceleration 1ms^-2. Simultaneously, B passes a point Q east of P with speed 4ms^-1 towards the west but with...
  8. A

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_w05_qp_1.pdf Question 12
  9. A

    math mechanics questions

    starting from rest at one set of traffic lights a car accelerates from rest to a velocity of 12m/s. It maintains this speed for 42 seconds until it decelerates to rest at the next set of red lights 60 seconds after leaving the first set. If the acceleration and deceleration are equal find the...
  10. A

    Chemistry: Post your doubts here!

    which ions are present in a solution of ethanol in an excess of concentrated sulphuric acid? 1) CH3CH2O^-1 2) CH3CH2^+OH2 3) HSO4^-1
  11. A

    math mechanics questions

    An electric train accelerates uniformly from rest to speed of 20ms-1 which it maintains until the brakes are applied it's them brought too rest by a uniform retardation equal in magnitude to twice its former acceleration . The total distance covered is 7.8 km and the total time taken is 7...
  12. A

    math mechanics questions

    I ) answer is 20seconds and iii) is 10m/s
  13. A

    math mechanics questions

    Part I and iii are incorrect
  14. A

    math mechanics questions

    And here is the other question I'm stuck on
  15. A

    math mechanics questions

    The ratio question is question 12
  16. A

    Chemistry: Post your doubts here!

    June 2007 question 34 and with explanation please to fully understand
  17. A

    math mechanics questions

    These are 2 separate question which I couldn't solve so may you help me to solve these 2problems
  18. A

    math mechanics questions

    a particle with constant accerleration along a straight line passing through points A,B and C with speed 2ms^-1 , 5ms^-1 and 8 ms^-1 respectively show that the ratio between the distances AB and BC is 7:13
  19. A

    mathmatics a leveal

    a particle with constant accerleration along a straight line passing through points A,B and C with speed 2ms^-1 , 5ms^-1 and 8 ms^-1 respectively show that the ratio between the distances AB and BC is 7:13
  20. A

    Chemistry: Post your doubts here!

    Two equilibria are shown below. reaction I 2X2(g) + Y2(g) gives 2X2Y(g) reaction II X2Y(g) gives X2(g) + 1/2Y2(g) The numerical value of Kc for reaction I is 2. Under the same conditions, what is the numerical value of Kc for reaction II?
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