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  1. I

    Chemistry Reaxns, conditions

    @becon of light............. just list out the reactions in which reflux required.....???
  2. I

    chem structures,,,,

    ya i knoe dat but asking when he says "draw" structural formula then.......wat i think the eg u have given is not drawn but written.....so that wat i am saying ke wat wed o when it says "draws"
  3. I

    chem structures,,,,

    hey i wanna aks that when examiner asks for us the structural formula to be shown many tymes they give concession on giiving displayed formula bt some times very strict............. n wat should we consider when it says draw structural formula...........???? displayed formula???? plz help...
  4. I

    Doubt on chemistry

    hey buddy ionic compunds are more stronger than covalent bonds................hence they have high mp.....n btw CaCo3 is more stable than magnesium carbonate as the thermal stability increses down the grup..........the logic behind that is the down the the group cation size increses while the...
  5. I

    Physics P2 Help Required

    q5 a I) as we all knoe wat circumference of the circle is so no doubt ans is 2 pi r n........... ii) w.D= Force into distance so w.d = f * 2pi r n b) torque= 2 f r.... or u can say fr+fr ...........which is equal to 2fr......... Total workdone = Forces * dstance so...
  6. I

    Standard of A level paper

    exactly no doubt...they have raised their standards of paper.....
  7. I

    'Zohaib Sherazi' promoted to Forum Moderator!

    hey congratz....
  8. I

    Physics P2 Help Required

    Q4 c: linear law of mommentum suggest that momentum of the system is always conserved usnless no external force provided... so we can say that the change in momentum of the ball is the momentum gain by the plate when ball strike with the base/plate......
  9. I

    Physics P2 Help Required

    q4 b i) F= mv- mu / t (derived the formula using rate of change of momentum) put the values in the formula u will get the ans... F= m(v-u)/t F= 35/1000(-4.5 -(3.5))/0.14 (when ball going upward took that direction velocity in negative)...
  10. I

    Physics P2 Help Required

    btq zahra u r talking abt current p3 papers happend....(mj 2010) u r saying that grade threshold wud be low this tyme ???
  11. I

    Physics P2 Help Required

    bt our teacher told us that when u wre given wvolume and th question is baout the mean seperation just take cube root of the volume u will get the ans..... ..
  12. I

    Physics P2 Help Required

    ok this is the picture for q4 d)
  13. I

    Physics P2 Help Required

    q3 c ii) as we know mean sepeartion ( V )1/3 i mean cuve root of volume... so first calculate it for water vapours and then in liquid divide them u will get ans 2 be 11.7............
  14. I

    HOW WAS PHY P33?????

    ya s same here i take theree values n take its average value...........
  15. I

    Physics P2 Help Required

    no horizontal velocity should be 18 as shown in diagram ......the object is not falling vertically bt following a projectile motion so theere must be some given velocity.......which is 18... so in vector diagram horizontal vector is 18 n vertical vector is 25........ n remember the angle...
  16. I

    Physics P2 Help Required

    in q3 c) i) p1 v1 = p2 v2 v1/v2 = p2 /p1 1/(1/1600) so ans = 1600
  17. I

    HOW WAS PHY P33?????

    gradient is positive ....confirmed abt that...........
  18. I

    HOW WAS PHY P33?????

    i got 1.4 somethng....bt it is close........n yes em sure abt the significant figures..
  19. I

    HOW WAS PHY P33?????

    yes u will get the markls for ecf...n ya 2 significant can be used..............btw u get quite close values of mine.........i got 1.84s////
  20. I

    HOW WAS PHY P33?????

    i wrote 2 significant.....as my raw data was presented in 2 significant... it depends upon u the significant of ur raw data...
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