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  1. Jia Yean

    AS Level Chem Practical Paper 35

    May I know what do you mean by that? Is this part of qualitative analysis? I'm a bit confused :confused:
  2. Jia Yean

    Statistics P6 : post your doubts here!

    Standard deviation = [499.2/15 - (72/15)^2 ]^1/2 = 3.2 Mean = 104.8 Σ(x − 104.8)/15 + 104.8 = 104.8 Σ(x − 104.8) = 0. Since std deviation is always the same, Std dev = 3.2 [Σ(x − 104.8)^2 /15 - (0/15)^2]^1/2 = 3.2 Σ(x − 104.8)^2 = 153.6 :)
  3. Jia Yean

    AS Level Chem Practical Paper 35

    Hino : I have never come across hydrogen peroxide in the qualitative analysis of CIE AS Level so far. I only remember using it when testing for some sort of rate of reaction experiment. :(
  4. Jia Yean

    lol thx! :)

    lol thx! :)
  5. Jia Yean

    AS Level Chem Practical Paper 35

    Hi there!! I'm having Chemistry practical exam (Paper 3) on the 25th of October. Are there any tips or special techniques that can be shared? I have a question though..- Regarding the "maximum error". For each burette reading, max error = 0.05 cm3 (half the smallest division) Thus, overall...
  6. Jia Yean

    May/June 2012 Question Papers + Marking Schemes + Examiner Reports + Grade Thresholds

    I am unable to open the link for the examiners report for A and AS level. :S
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