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  1. H

    Mathematics: Post your doubts here!

    Can you please show how to obtain the answers using trigonometry on the diagram ?
  2. H

    Mathematics: Post your doubts here!

    I mean the argand diagram if you can please ?
  3. H

    Mathematics: Post your doubts here!

    Can you please show it in a diagram ?
  4. H

    Mathematics: Post your doubts here!

    Can someone please show me how to do this ?
  5. H

    Mathematics: Post your doubts here!

    How do you find the least value of |z-w| ?
  6. H

    Mathematics: Post your doubts here!

    Can someone please show me how to do this ?
  7. H

    Mathematics: Post your doubts here!

    Can someone please show me how to do question (ii) ?
  8. H

    Mathematics: Post your doubts here!

    Can some please show me the sketch and shading of this ?
  9. H

    Mathematics: Post your doubts here!

    yes i tried that but i did not get the right answer
  10. H

    Mathematics: Post your doubts here!

    Can you please show me the steps for question (iii) ?
  11. H

    Mathematics: Post your doubts here!

    Calculation by vector product to find normal of plane OAB ?
  12. H

    Chemistry: Post your doubts here!

    Can you explain how this is nucleophilic substitution
  13. H

    Chemistry: Post your doubts here!

    how about with H2O2 ? there are two equations. when do you know which one to use ?
  14. H

    Chemistry: Post your doubts here!

    but it is H+ in the equation, isn't that acidic ?
  15. H

    Chemistry: Post your doubts here!

    in the data booklet there is another equation for MnO4- which is MnO4- + 4H+ + 3e ---> MnO2 + 2H2O why can't we use this one ?
  16. H

    Chemistry: Post your doubts here!

    Acidified solutions of iron(II) salts can be titrated using a dilute solution of potassium manganate(VII), KMnO4. write a balanced ionic equation. which equation should we use for MnO4- ions and why do we use this ?
  17. H

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w09_qp_42.pdf question 5. How do you solve this question and from what chapter is this from ?
  18. H

    Chemistry: Post your doubts here!

    http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w09_qp_42.pdf question 5. How do you solve this question and from what chapter is this from ?
  19. H

    Chemistry: Post your doubts here!

    how do you solve this ?
  20. H

    Chemistry: Post your doubts here!

    the idea of a reaction occurring if it's more than 0.3 V is if is under non-standard conditions. However, this was not mentioned in the question for nitric acid and copper
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