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  1. queen of the legend

    Chemistry P41 How was it?

    but it was EQUILIBRIUM ...plus there was no change in temp, pressure or concen. of any reactants and no catatlyst to increase the rate ....i dont knw but i wrote conc. remains equal on both sides of the equation :( the reduction potential just tels us if the reaction (forward) is feasible or not
  2. queen of the legend

    Chemistry P41 How was it?

    i got 25 for Kc value ....wat bout the question that asks about equlibrium is it more twards right or left ??!
  3. queen of the legend

    Chemistry P41 How was it?

    what was the Kc vlaue ??
  4. queen of the legend

    How was the AS chemistry practical 31 ?

    what was the percentage difference between the experiments???
  5. queen of the legend

    How was the AS chemistry practical 31 ?

    wat was the other ion in the solutions ?
  6. queen of the legend

    Physics: Post your doubts here!

    a) State the relation between electric field strength E and potential V. ...
  7. queen of the legend

    Paper 5 Tips !! :)

    wat bout the 100 g of water ...plz elaborate on that ....if solubility is supposed to be mass of solid over 100 g of water ...the volume of water calculatedfrom the coloumn would not give 100g !?!!
  8. queen of the legend

    Paper 5 Tips !! :)

    you can use a spirit lamp contaning the fuel .....refer to m-j 2008 ....there a useful diagram in the question itself
  9. queen of the legend

    Paper 5 Tips !! :)

    can some1 just quickly exaplain M-J 2011 v.53 ...question 2 ...about solubility in g/100g of water ....how do we exactly solve for that colomn ....pls reply soon
  10. queen of the legend

    Paper 5 Tips !! :)

    opps sorry :oops: well i am not very sure about solubility myself ! the MS is not clear as well it say " Correct units,(allow g/100g without the solidus)" i dnt understand what exactly solidus mean here?!
  11. queen of the legend

    Paper 5 Tips !! :)

    v.53 is about moles ratio ....very easy ...........calculate mass of lead (C-A) ....then mass of oxygen(C-B) ....the other columns ...get the no. of moles by diving each mass by Ar of the element ....plot a graph of moles of lead against moles of oxygen ,...the slope give u a ratio hence the...
  12. queen of the legend

    Paper 5 Tips !! :)

    which variant ?
  13. queen of the legend

    Paper 5 Tips !! :)

    In o/n 2008 paper ...question 1 : the solubility is given as mass of solid/ mass of water x 100 ............does that mean mass of solid crystallised or undissolved??
  14. queen of the legend

    Physics: Post your doubts here!

    everything is given ...taking moments ..clockwise moments wa+fh=2Wa..... and in the question the corner of the wall is considered as the pivot
  15. queen of the legend

    Physics: Post your doubts here!

    oct/nov 2009 : q 22 , 23, 26, 28 oct/nov 2010: q 13
  16. queen of the legend

    Physics: Post your doubts here!

    anyone knws how to solve this 22 A steel string on an electric guitar has the following properties. diameter = 5.0 × 10–4 m Young modulus = 2.0 × 1011 Pa tension = 20 N The string snaps, and contracts elastically. By what percentage does a length l of a piece of the string contract? A 5.1 ×...
  17. queen of the legend

    Physics: Post your doubts here!

    question 7 is direct application of formulas for vertical displacement s= ut + o.5 gt^2 and horizontal is S=ut question 10 : since f and m are directly proportinal ...heavier mass need more force to move .. so , masses given m and 3 m ...if F=1 N then 3/4 the force goes to 3m and 1/4th to m...
  18. queen of the legend

    Physics: Post your doubts here!

    for 27 : distance between one maximum and another is 15mm = 0.5 lambda so lamda =0.03m all electromagnetic waves travel at same speed= 3x 10^8 use v=f lambda , for f f = 3 x 10^8 / 0.03 = 1 x 10^10 hz for 24 : the amplitude of y is half of x by looking at the diagram= 4 now T= 1/F ...T for X...
  19. queen of the legend

    Physics: Post your doubts here!

    originally the liquid's height was h ...when heated it expands and the increase is h again ...so its =2h
  20. queen of the legend

    Physics: Post your doubts here!

    first of all newtons first law applies here .....only when a force acts on the object it causes a change in its velocity so when sand is added first v decreases due to increase in mass ......when sand falls out the velocity stays the same since there is no force to increase its velocity later...
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