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  1. S

    Who so ever gave away a wrong guess(chemisrty P34) should think of what will Allah do to them...!!!

    Wrong on so many levels. 1) Whomsoever; 2) Chemistry; 3) Guess paper...read the first word again...slowly...; 4) Welcome to the Internet.
  2. S

    um confused with chemistry p4 :( 2012 xam

    *stuck
  3. S

    Chemistry P4| A2 only

    You're welcome in advanced.
  4. S

    S2 Mathematics : Masters of statistics 2 please help us

    Hey
  5. S

    Chemo P5 tips

    http://www.elateafrica.org/elate/biology/nutrition/studentactivities2.jpg It's that big beaker full of water/ Please google before asking (i.e: make some effort).
  6. S

    exam time

    It depends on the lab you're in. If they're using syringes with divisions of 0.1cm3, then write that for the first part, and the degree of uncertainty would be half of that (i.e: ±0.05cm3). P.S: This isn't a Bio doubts thread, so post your other questions elsewhere.
  7. S

    Chemistry MCQ?

    Imagine the curve is being depressed by a force from the top left. That makes the X higher (the curve needs to have a high proportion of 'slower' gas molecules), while the Y decreases (along with the Z); (also imagine pulling it up from the X point). Answer is B.
  8. S

    Chemistry MCQ?

    Well, N is reduced from +3 to 0. But the way they ask the question...Maybe it undergoes A redox reaction, so maybe "either reduction or oxidation" (like saying A substitution reaction, so can be electrophilic OR nucleophilic).
  9. S

    Chemistry MCQ?

    True. Practicing these calculations will make you answer the question in about a minute. And it's not Paper 2 or 4, so you don't ACTUALLY have to write down any working. Skip a few steps (do them mentally), and only write things you may confuse like the number of moles.
  10. S

    Chemistry MCQ?

    CxHy + O2 --> CO2 + H2O number of moles of CO2: 35.2g / (12+16+16)gmol-1 =0.8 mol. Same number for H2O. CxHy has 0.2 mol, meaning 4 less (ratio) than CO2 ad H2O, so: CxHy + O2 --> 4CO2 + 4H2O Balancing the Cs, and following the molar...
  11. S

    Applications of Physics and Chemistry.

    For applications for Sciences, CIE published Applications Support booklets a while ago that you could benefit from. They're found as the first files in each subject folder (the _as files). Don't think you need anything more. And for Paper 5, they mostly ask similar questions from year to year...
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