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  1. H

    Chemistry: Post your doubts here!

    in 2002 october november An aqueous solution of iron(III) chloride is used to dissolve the excess of copper metal from printed-circuit boards the mark scheme allowed both Cu2+ and Cu+ despite the voltage being less than 0.3 V ,when using Cu+ .
  2. H

    Chemistry: Post your doubts here!

    why can't we use Cu+ instead of Cu2+ ?
  3. H

    Chemistry: Post your doubts here!

    When concentrated nitric acid, HNO3, is added to copper turnings, a brown gas is evolved. Use data from the Data Booklet to construct an ionic equation for this reaction. which equation of copper should i use and why ?
  4. H

    Physics: Post your doubts here!

    explanation for question 6 please http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_s04_qp_4.pdf
  5. H

    Mathematics: Post your doubts here!

    can you explain why it isn't 5.5 ?
  6. H

    Mathematics: Post your doubts here!

    marking scheme says that the midpoints are 5, 15...
  7. H

    Mathematics: Post your doubts here!

    can you help find the midpoints ? please explain.
  8. H

    Mathematics: Post your doubts here!

    if you actually calculate each probability you get a different answer. for example probability of meal served on time and kitchen is a mess = (1/5)*(3/5)=0.12. why are the answers different ?
  9. H

    Mathematics: Post your doubts here!

    how did you get 0.1 ?
  10. H

    Mathematics: Post your doubts here!

    Thank you What is the probability of meal served on time and kitchen in a mess ?
  11. H

    Mathematics: Post your doubts here!

    if it was 2.8<=x<3, is the midpoint 2.8+2.9/2 ?
  12. H

    Mathematics: Post your doubts here!

    Can you show me how to do it for this one ?
  13. H

    Mathematics: Post your doubts here!

    How about this one ? Will the first midpoint be 3 or 2.5 ?
  14. H

    Mathematics: Post your doubts here!

    where did 1 come from ? isn't it 0<=x<=100 so shouldn't it be 0+100/2 ?
  15. H

    Mathematics: Post your doubts here!

    first midpoint is 50.5 not 50
  16. H

    Mathematics: Post your doubts here!

    How do you find the midpoint of each ?
  17. H

    Maths, Addmaths and Statistics: Post your doubts here!

    How do you find the midpoint of each ?
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