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  1. soumayya

    Maths URGENT HELP Plz

    didn't quite understand wat u did... u hve to measure the length of AB on the map (in cm)... suppose AB is 5 cm on the map... 5 cm on map represents 1200 cm 1 cm on map represents 1200/5 = 240 so scale is 1: 240
  2. soumayya

    Maths URGENT HELP Plz

    hey..it's pretty much ze sme as u r doing LCM... LCM = 225n = prime factors of 225 x 2 x 2 x 3 so, n = 2 x 2 x 3= 12 hpe u understand...it's much straightforward n saves time during exam...
  3. soumayya

    Maths Paper 6 2004 Help Please!!

    (i) no. of different arrangements using all nine letters = 9! / (2!x2!) = 90720 as there are 9 letters, u have to do 9!...but u should divide by (2!x2!) since there are 2 A and 2 N (ii) CVCVCVCVC no. of ways of arranging the consonants = 5! / 2!=60 (u hve to divide by 2! bcz there are...
  4. soumayya

    chemistry_9701/1_ppr1_jun04 & nov 04!!

    u've got an explanation for the other numbers...???? btw...u understood my explanations..???
  5. soumayya

    Maths URGENT HELP Plz

    i fink u missed out a 3!!!! the problem is simpler than having to find the LCM... U just hve to consider the prime factors which are not common to both 225 & 540...so, n = 2 x 2 x 3 = 12
  6. soumayya

    Maths P1 13th/oct .. how was it?

    i don't fink points are given for just writing the formula without substituting any values... btw...even your given formula is wrng..it should be volume = pi (integral sign) (curve)2 - (line)2 dx limits from 0 to 5
  7. soumayya

    practicals.............

    Thank God i haven't had the practical paper yet...i would hve relied on these predictions....lolzz
  8. soumayya

    integration question of NOV 2010

    i got the same coordinates...it has to be correct...because they satisfy the given equation of the line..
  9. soumayya

    practicals.............

    pffff...i read the whole thread..grasping all ze information...to knw in ze end that it was for the last session....
  10. soumayya

    integration question of NOV 2010

    yh..lol
  11. soumayya

    integration question of NOV 2010

    i was thinking of a delicious pie at that moment.....lol
  12. soumayya

    chemistry_9701/1_ppr1_jun04 & nov 04!!

    N 04 No. 3 10 cm3 of CH3SH will produce 20 cm3 of gases (10 cm3 of CO2 + 10 cm3 of SO2...not counting H2O since it is liquid at room temperature) only 30 cm3 of O2 will react, so there will be 30 cm3 of O2 remaining Total volume of gases= 20 + 30 = 50
  13. soumayya

    chemistry_9701/1_ppr1_jun04 & nov 04!!

    J 04 No. 28 u just have to put OH and H as u break the C double bond C only compound D gives a tertiary alcohol (which is generally unreactive towards mild oxidising agent like K2Cr2O7)
  14. soumayya

    chemistry_9701/1_ppr1_jun04 & nov 04!!

    J 04 No.18 NaCl + H2O ---> NaOH + 1/2 Cl2 + 1/2 H2 58.5 g (1 mole) of NaCl gives 35.5 g (0.5 mole) of Cl2 , 1 g (0.5 mole) of H2 and 40 g (1 mole) of NaOH 58.5 kg of NaCl gives 35.5 kg of Cl2, 1 kg of H2 and 40 kg of NaOH
  15. soumayya

    chemistry_9701/1_ppr1_jun04 & nov 04!!

    J 04 No. 16 Li2+ cation has high polarising effect on the large carbonate anion(like Mg2+), so distorting its electon cloud system....hence LiCO3(like MgCO3) is partly covalent and decomposes at low temperatures... magnesium does react readily with oxygen..
  16. soumayya

    chemistry_9701/1_ppr1_jun04 & nov 04!!

    J 04 No. 9 It cannot be ethanoic acid because it is a weak acid and will not produce the same amt of H+ in solution as HCl Sodium hydroxide is an alkali, so will produce OH- in solution, not H+ Sulphuric acid is a dibasic acid producing twice as much H+ in solution compared to HCl so...HNO3 is...
  17. soumayya

    chemistry_9701/1_ppr1_jun04 & nov 04!!

    J 04 No.8 3FeO(s) + 2Al (s) ---> 3Fe(s) + Al 2O3(s) u have to draw a hess cycle with the arrows pointing towards FeO and Al2O3 don't 4get to multiply the enthalpy change of formation of FeO by 3 since there are 3 moles in the equation reverse the sign for enthalpy change of formation of FeO...
  18. soumayya

    chem ppr 1 HELP PLEASEE!!

    2 moles of HI produces 1 mole of I2 and 1 mole of H2 so, x moles of HI produces (x/2) mole of I2 and (x/2) mole of H2
  19. soumayya

    Cytplasm and Cytosol--Biology!

    cytoplasm includes everything in the cell except the nucleus cytosol is the soluble portion of the cytoplasm in short, cytosol= cytoplasm - organelles
  20. soumayya

    General Paper 8009

    Who has done zis paper over hre...?
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