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Biology; Chemistry; Physics: Post your doubts here!

Discussion in 'Cambridge O Levels' started by scouserlfc, Sep 13, 2011.

  1. Rimsa

    Rimsa

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    thanku :)
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  3. multixamza01

    multixamza01

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    glad to help.
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  4. shahzaib roudani 12

    shahzaib roudani 12

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    wheresthe specimen for chemistry
  5. ashiqbal

    ashiqbal

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    you lucky guy!
  6. Spidey21

    Spidey21

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    yes this should work pretty fine looking at what the question asks...but i would recommend not taking a chance on your three year hardwork and writing like this
    plants (producers) ----> Cow ( primary consumer) ---------> Lion ( secondary consumer) ----------> Bacteria (decomposers)

    :D :p :D :p
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  7. beeloooo

    beeloooo

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    explain why observed ratios often differ from expected ratios, especially when there are small numbers
    of progeny; plz any1 answer diz properly :)
  8. Spidey21

    Spidey21

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    progeny??
    let me share what i know...
    if your talking about yeild??
  9. fatikhalid

    fatikhalid

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    where did u confirm?
  10. nafis shahRiyar

    nafis shahRiyar

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    exactly what should be studied for ATP in the night before the exam??o_O
  11. convent2012

    convent2012

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    how many of the electrons in a molecule of ethane, C2H6 are not involved in bonding?? how ???
  12. convent2012

    convent2012

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    decane ------> ethane ------> poly(ethene) " how molecular size changes during this process ??? "
  13. multixamza01

    multixamza01

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    it' better to practice past papers beforehand , and do a quick go through of the entire thing once .

    Make a dot - cross diagram. Check .

    Something like this :
    3H - C - C -H3 => 3H : C : C : H3 ( 3H : C - means 3 single covalent bonds between C-H)

    =>No electrons are not involved in sharing .


    Decreases ( decane ----> ethane )
    Decreases (ethane -----> ethene )
    Increases [ ethene -----> poly(ethene)]
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  14. Spidey21

    Spidey21

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    well i recommend you go through the experiments in the book and the basic things used in the experiments, even the basics, i guess that will help you out...and yes obviously...do some prayer for yourself for a good paper...:D
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  15. fatikhalid

    fatikhalid

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    practice past papers!..o_O
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  16. fatikhalid

    fatikhalid

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    (i) describe the use of an astable circuit
    (ii) describe how the frequencey of an astable circuit is related to the values of the resistive and capacitative components
  17. fatikhalid

    fatikhalid

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    state the meaning of the terms processor , output device and feedback
  18. SalmanPakRocks

    SalmanPakRocks XPC Moderator Staff Member

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    Subject?
  19. fatikhalid

    fatikhalid

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    physics
  20. convent2012

    convent2012

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    help me in chemistry n2004 p2 a1 part c !
  21. SalmanPakRocks

    SalmanPakRocks XPC Moderator Staff Member

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    Decreases, Descreases, Increases

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