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  1. simDS

    chem quesiton

    the balanced equation is 2Al + 3H2SO4 --> Al2(SO4)3 + 3H2 how much Aluminum Sulfate can be produced from 10g of aluminum (unlimited H2SO4)? how much aluminum sulfate can be produced from 10g of aluminum when only 0.3 mol H2SO4 is present? thanksss
  2. simDS

    chem question

    can someone please do this question ... whats the equation?? Hydrogen peroxide (H2O2) oxidised to Oxygen thanks...:D
  3. simDS

    where did the C come from..,,

    By chemical means originally and subsequently by other means, it has been found that the relative atomic masses are: Zn 65.37 and S 32.06. [The basis of the scale is that 12C is 12]. hey.. i just want to know wth 12C is ... btw... i have no chemistry knowledge.. lol...
  4. simDS

    help! AFI - food retail

    can someone please help with this question. using 2 examples, explain how the food retail sector contributes the Aust. economy
  5. simDS

    Atar estimate please.

    hey, can someone please estimate my Atar mark.. standard english - 32/98 2U maths - 39/73 IPT - 2/11 Food Tech - 3/8 Biology- 2/56 thanks... btw.. school rank - 193
  6. simDS

    locus

    <DIR>hi... hey can anyone solve this:bomb:... thanks....:confused::confused: The point P(x,y) moves so that its distsnce PA from the point A(1,5) is always twice its distance PB from the point B(4,-1). show tjat the equation of the locus is x^2 + y^2 - 10x + 6y + 14 =0 </DIR>
  7. simDS

    log help

    find the 2nd derivative of y= loge (x/2)
  8. simDS

    help with logs

    hey i cant do this question could someone please solve. f(x)= loge (2x+1) find f`(1) thanx
  9. simDS

    Survey: Do you like hummous? (yes/no)

    hey i have to develop a food product for food tech. i just need to know how many 'teens' like 'hummous dip' for my survey. jsut need to answer yes/no thanks
  10. simDS

    integration help

    can someone please solve these questions: (i) integral of x^1/2 (ii) integral of the squre root of (x-1) thanks
  11. simDS

    help. 2007 probability. Q9a

    hey this this Q is from the 07 hsc. can someone please help:rofl: A pack of 52 playing cards consist of four suits with 13 cards in each suit. (i) one card is drawn from the pack and kept on the table. a second card is drawn and placed beside it on the table. what is the prob. that the...
  12. simDS

    help! integrating exponential

    how do you find the integral of xe^x^2 bounderies x=1-2 thanks
  13. simDS

    Help - trig identities

    can somwone please help prove sin^4 theta - cos^4 theta = 2sin ^2 theta - 1 thanks
  14. simDS

    Differentiate

    hi, hey can sombody please help me. :cold: i can diffentiate it but how do you test the answer? 'find all values of x for which the curve f(x) = x^3 - 3x + 4 is decreasing' thanks
  15. simDS

    mathematics-au.com

    which schools use this program? mathematics-au.com
  16. simDS

    help! basic functions finding range

    what is the range of these functions assuming the domain in each case is all the real numbers which give meaning (a) f(x)=x^3 ((b) y=x^2+4
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