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Chemistry DONE!!!

Discussion in 'Cambridge IGCSE' started by Utsm, May 23, 2013.

?

A*

  1. 130-140

    8 vote(s)
    10.3%
  2. 140-150

    27 vote(s)
    34.6%
  3. 150-160

    28 vote(s)
    35.9%
  4. more than 160

    19 vote(s)
    24.4%
Multiple votes are allowed.
  1. Utsm

    Utsm

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    Guys now that we are done with chemistry share ur opinions on gt for A*:)
     
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  3. $$AK$$

    $$AK$$

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    mark out of 200??
     
  4. mustafaata1

    mustafaata1

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    yes, out of 200
     
  5. waleed302

    waleed302

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    Which variant?
     
  6. oahmed64

    oahmed64

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    in the question about magnesium salts,was the volume of acid needed to neutralise noted or not?
     
  7. samar444

    samar444

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    it was noted
     
  8. Wolfgangs

    Wolfgangs

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    For the question that involves rusting. There was a question about what happens to the pH of the water when base is added to it, what was it's answer? And in what way can it help reduce the rusting which I wrote "It takes off dissolved oxygen so less chances of rusting". What did you guys write?
     
  9. sara fayed

    sara fayed

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    ionic equation what did you do guys in it variant 31
     
  10. Wolfgangs

    Wolfgangs

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    Ca^2+ + H2O + CO2
     
  11. abdulrhaman munther

    abdulrhaman munther

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    Guys yeah .. What did you write about the pH?
    What about the solution of MgCl?
    And how do we remove the indicator?
     
  12. thamer hsm

    thamer hsm

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    the answer for solution of magnesium chloride is as follows.
    put 25cm^3 of HCl in a beaker and warm. Add powdered magnesium oxide by means of a spatula and stir by a glass rod. Stop the addition when no more magnesium oxide dissolves and then filter.The filtrate obtained is magnesium chloride solution.

    I'm not sure but that's what i wrote.
     
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  13. samar444

    samar444

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    t
    the same
     
  14. Iridescent

    Iridescent

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    The pH increases due to the addition of base.
    Yes, as oxygen is removed, rusting cannot take place.
     
  15. oahmed64

    oahmed64

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    guys the question of the soluble salt that was made by titration,the question that asked how to remove the indicator.
    in the question did he say that the volume of the acid needed to neutralise the base was NOTED or not?
     
  16. Pikooooooooo

    Pikooooooooo

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    yes the question said, that the volume of acid needed was noted!
     
  17. oahmed64

    oahmed64

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    and there was one ionic equation of displacment of a metal from a salt,what were the reactants again i remember it involved zinc
     
  18. Pikooooooooo

    Pikooooooooo

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    right silver nitrate i guess and zinc~
     
  19. ganesh

    ganesh

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    W
    What abt mgco3 and hcl
     
  20. thamer hsm

    thamer hsm

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    that's also correct garnesh but i felt magnesium oxide was better
     
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  21. Pikooooooooo

    Pikooooooooo

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    yes true, but using either MgO, MgCO3 or Mg(OH)2 is also correct... :) !
     
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