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  1. waleedsmz

    Big problemin chemistry

    metal carbonates are not bases. acid+alkali= salt + water it's a salt
  2. waleedsmz

    help in bio!

    reliable and accurate are just vocabulary! reliable means you count on the results more, but it doesn't make it more accurate! Repeating doesn't make the testing procedure more accurate, instead it makes it reliable ;)
  3. waleedsmz

    Ques for Bio P6

    The X-axis is the variable that you're testing for. for example, if you're given PH and time for enzyme activity. PH will be x-axis, time will be on the Y.
  4. waleedsmz

    Help ! MAth Nov 08 P4 , A Stupid Sequence Problem !

    Is this sum rule included in the syllabus? It's the first time for me to see it!
  5. waleedsmz

    help in bio!

    Reliability means that the experiment becomes more reliable. Examples: Repeating the experiment and calculating and average makes the result more reliable. Using same conditions in an experiment makes it more reliable. A control experiment means repeating an experiment with all conditions...
  6. waleedsmz

    Chemistry Revision

    Re: Chemistry Paper 6 Revision I haven't seen the flame tests anywhere! From where did you get those? I think they're out of the syllabus
  7. waleedsmz

    Chem Paper 6 Question

    honestly, I have no idea! :D but the yellow ppt isn't barium iodide! From where did you get the Barium anyway?
  8. waleedsmz

    Chem Paper 6 Question

    as for part D, the residue is lead carbonate, so when potassium iodide is added in an acidic medium ( made by nitric acid ) , a yellow ppt of lead iodide will be formed. It's as if you're testing for iodide ions, just backwards. ;)
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