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  1. Anallia

    Mathematics: Post your doubts here!

    can someone please help with question 9b) http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20(9709)/9709_w13_qp_33.pdf
  2. Anallia

    Chemistry: Post your doubts here!

    use the bond energy for Cl-Cl bond given in the data booklet
  3. Anallia

    Chemistry: Post your doubts here!

    it is because the sodium metal attacks an -OH group. Sodium substitutes the hydrogen on the oxygen forming a salt (O-Na+) giving out hydrogen as the other product....whereas in ethanal there is a C=O bond and a C-H bond, there is no -OH group to attack hope this helps :-)
  4. Anallia

    just take in what they say and prove them wrong :)

    just take in what they say and prove them wrong :)
    • Anallia
    • Profile post comment
  5. Anallia

    the sky is not the limit if you're willing to go further

    the sky is not the limit if you're willing to go further
    • Anallia
    • Profile post
  6. Anallia

    Physics: Post your doubts here!

    for 16 efficiency= energy output/energy input ie work done by car/driving force giving us D as the answer 27 in an electric field when two points are at 90 degrees to each other, no work is done therefore the energy is 0 which is A 34 from kirchoff's second law (the sum of emfs=sum of pds)...
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