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  1. L

    Chemistry: Post your doubts here!

    How do you draw the apparatus to collect water and then N2O? 1c: papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Chemistry%20(9701)/9701_s12_qp_52.pdf
  2. L

    Chemistry: Post your doubts here!

    Does anyone know how to solve the molecular mass question? 9701/52/MJ/15 Q2di
  3. L

    Chemistry: Post your doubts here!

    For CIE A level Chem, is there a simple way to remember when to use reflux when not to use? The mark schemes aren't very consistent...
  4. L

    Chemistry: Post your doubts here!

    nehaoscar, so in the exam should I write volumetric apparatus or burette? Thanks.
  5. L

    Chemistry: Post your doubts here!

    Hi guys, can anyone tell me what volumetric apparatus is? In MJ15/53 the answer for measuring 5cm^3 of liquid is to use volumetric apparatus, there's no mention of burette..
  6. L

    Mathematics: Post your doubts here!

    A die is biased. The mean and variance of a random sample of 70 scores on this die are found to be 3.61 and 2.70 respectively. Calculate a 95% confidence interval for the population mean score. http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_s14_qp_71/...
  7. L

    Chemistry: Post your doubts here!

    Can anyone explain to me why the potential of the electrode decreases as [Ag+] decreases? 1)b)ii) http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w05_qp_4.pdf Shouldnt it increases because in Ag+ + e => Ag, decreasing Ag+ would shift equilibrium...
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    Mathematics: Post your doubts here!

    (i) Deng wishes to test whether a certain coin is biased so that it is more likely to show Heads than Tails. He throws it 12 times. If it shows Heads more than 9 times, he will conclude that the coin is biased. Calculate the significance level of the test. (ii) Deng throws another coin 100...
  9. L

    Mathematics: Post your doubts here!

    A die is biased. The mean and variance of a random sample of 70 scores on this die are found to be 3.61 and 2.70 respectively. Calculate a 95% confidence interval for the population mean score...
  10. L

    A level Biology: Post your doubts here!

    Hi guys, can anyone explain to me how the collection of mature oocytes work in IVF? In 2014 summer/43, the collection of mature oocytes: But in 2007/winter, "outline the techniques of IVF", here they want to stimulate ovulation??? What is HCG/GNRH agonists and why is there no superovulation...
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    Mathematics: Post your doubts here!

    Hi guys can anyone help me with this question? manya squareroot each root you got from a that's the answer.
  12. L

    Mathematics: Post your doubts here!

    Hi friends, can anyone show me how to do Question 4 of 9709_s14_qp_31? It is about differential equations- I don't know why the answer has k in the answer instead of just +c. Thanks! :)http://maxpapers.com/syllabus-materials/mathematics-9709-a-level/attachment/9709_s14_qp_31/
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