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  1. jeffwu95

    Some harder questions.

    ooo looks hard :) thanks
  2. jeffwu95

    Total Dissolved Solids Calculation

    Why exactly would you need to add HNO3? isnt addition of HNO3 just for the detection of carbonates
  3. jeffwu95

    Total Dissolved Solids Calculation

    b)The question specifies chemical test so dont say like AAS, i guess you could add Cl ions (HCl) to precipate the lead into lead chloride
  4. jeffwu95

    Total Dissolved Solids Calculation

    a)So In this water, it will contain both suspended solids and dissolved solids, the procedure to determine the concentrations of TDS is to filter out the suspended solids with filter paper then to evaporate the remaining water to obtain just the dissolved solids (ie how boiling salty water will...
  5. jeffwu95

    2010 scegs probability

    Can someone confirm, im not great at perms and combs You make the mother a fixed seat as it is a round table so there are 5 seats left, and the father can sit on either seat beside the mother so (times 2) Excluding the mother, father, and Chelsea there are 3 people left which can occupy the seat...
  6. jeffwu95

    (Finalised) Official BOS Mathematics Trial Examinations.

    Re: Official BOS Mathematics Trial Examinations: Spring Edition. Imma come! but ill probably fail :D
  7. jeffwu95

    oxidation states??

    If there is a deficiency of electrons clearly the oxidation state would be positive, however for the oxidation state to change (increase/decrease) a change in the number of electrons of the species would have to occur
  8. jeffwu95

    eddy currents.

    My physics teacher said that the board of studies were stupid and it should slow down even with slots
  9. jeffwu95

    i went usyd today. so much walking D:

    i went usyd today. so much walking D:
  10. jeffwu95

    yea recently its fun but so bludgey

    yea recently its fun but so bludgey
  11. jeffwu95

    haha hey man! from macquarie fields ye? :p

    haha hey man! from macquarie fields ye? :p
  12. jeffwu95

    Can you get marked down for not answering questions with a particular answer?

    Always say laminated iron core and iron ferrites
  13. jeffwu95

    Perms and combs question

    Thanks! so smart (y)
  14. jeffwu95

    Perms and combs question

    The answer is 864
  15. jeffwu95

    Perms and combs question

    i attempted to do that, and also included if there was just one woman, but i dont get the answer
  16. jeffwu95

    Perms and combs question

    In how many ways can 5 men and 5 women be arranged in a circle so that the men are separated? In how many ways can this be done if two particular women must not be next to a particular man? I need help with the second part :)
  17. jeffwu95

    how much extra study is really needed for 4u?

    around 10 hrs per week on 4u
  18. jeffwu95

    Cssa 2012 results

    just got back results got 1/15 for last question hahaha
  19. jeffwu95

    LOL yea! 10 bux hahaha. howd u go?

    LOL yea! 10 bux hahaha. howd u go?
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