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  1. H

    Bio and Chem ATP!

    plz can someone give me the link to quality Bio ATP and Chem ATP notes? Thank you
  2. H

    Maths, Addmaths and Statistics: Post your doubts here!

    I figured a way to do these kind of questions. So unit vector in direction 3i+4j= (1/5)(3i+4j) velocity vector= 20(1/5)(3i+4j)= (12i+16j) km/h hoped this helped you
  3. H

    Maths, Addmaths and Statistics: Post your doubts here!

    Why is everyone posting the calculator version CIE? Isnt it syllabus D in Pakistan?
  4. H

    Biology; Chemistry; Physics: Post your doubts here!

    could anyone plz post the link to the best Bio ATP notes here? thank you
  5. H

    Biology; Chemistry; Physics: Post your doubts here!

    yep. theres a choice. nope not learning them as there's pretty useless info about logic gates around.
  6. H

    Chemistry acid/base help

    this contradicts everything. First of all, the flask contained the alkali, but at neutralisation, there would be a slight excess of acid, right? Secondly, is tap water acidic or alkaline? Thirdly, any one in his right mind would of course use a dry flask instead of a wet one, containing no drops...
  7. H

    Chemistry acid/base help

    what reading? pH? all we want to do is neutralise the flask/burette
  8. H

    Chemistry acid/base help

    Oct/Nov 2011 says; Wash with tap water then with distilled water......
  9. H

    Chemistry acid/base help

    what's the logic behind that?
  10. H

    Chemistry acid/base help

    so supposing a conical flask/burette has recently been used for titration and is washed out with acid/alkali, what steps are carried out before the flask/burette can be reused?
  11. H

    Biology; Chemistry; Physics: Post your doubts here!

    what in elimination? on what basis did you eliminate the others?
  12. H

    Formation of Stars in Physics?

    sorry to bump this thread, but in stars the major energy conversion taking place is nuclear to heat right?
  13. H

    Biology; Chemistry; Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20O%20Level/Biology%20%285090%29/5090_w12_qp_11.pdf
  14. H

    Biology; Chemistry; Physics: Post your doubts here!

    anybody know o/n 2012 p12 q 37 about the homogeneous bacteria? Bio
  15. H

    Biology; Chemistry; Physics: Post your doubts here!

    because it never does. some weird clash b/w phy and bio but still, in bio light never converges at the retina; only a point before, so that a diminished, reversed and inverted image forms on the retina.
  16. H

    Biology; Chemistry; Physics: Post your doubts here!

    Chemistry question, so supposing a conical flask/burette has recently been used for titration and is washed out with acid/alkali, what steps are carried out before the flask/burette can be reused?
  17. H

    Biology; Chemistry; Physics: Post your doubts here!

    Help plz Bio w12 p11 Q37 I can't figure it out
  18. H

    Biology; Chemistry; Physics: Post your doubts here!

    ^oops, paper 11 not 12
  19. H

    Biology; Chemistry; Physics: Post your doubts here!

    Hello there, I'm having some trouble with the O/L Oct Nov 2012 Bio P12 Q37 What are homogenized bacteria?
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