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  1. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    :cry: :cry: :cry:
  2. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    which HCl ques??
  3. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    yup thts wht i wrote the 1st option ws tht brass can be represented by a chemical formula,which ws wrong, wasnt it??? and the 2nd one ws tht zinc and Cu react or sth
  4. gary221

    CHEM PAPER 3 DOUBT... PLEEEZ HELP

    1 mole of either CO3 will give u 1 mole of CO2 so u hve 5 moles of CO2 thus no of moles of total CO3 = 5 see u alredy hve 2 moles of NaHCO3 terefore moles of NaCO3 = 5-2 = 3 hope u got it!!
  5. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    hey how come its nitrates??? the ques only mentioned the cations, how can it be only nitrates??? it could be anything!!
  6. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    but Cu is also used for electrical wiring how wre we expected to know which is correct???
  7. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    i think it said core!
  8. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    exactly!! i think most wires r made of Cu thts wht it said in my book
  9. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    do u mean the main constituent of natural gas???? i think i did methane too!!
  10. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    even i did!! wht was the ans to that barium and silver ions??? i did D
  11. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    so wht was the ans to tht??? i did c which is wrong anyway!!!
  12. gary221

    CHEM PAPER 3 DOUBT... PLEEEZ HELP

    d first ques- to caculate no. of moles 4 a gas, the formula is moles = volume(in dm3)/24 so moles of CO2 = 120/24 = 5 moles for d second one in the equation, we can see that to produce 1 mole of CO2 2 moles of NaHCO3 is needed so...
  13. gary221

    THIS or THAT

    lion and its not a place its an animated cartoon!!! cheese or butter?????
  14. gary221

    THIS or THAT

    skinnyboyfat tht sounds better!! madagascar or ratatouille????
  15. gary221

    CHEMISTRY PAPER 3 DOUBTS HERE ....

    same stoiciometry needed moles = mass of compound/RFM calculate the mass of Si, mass = moles *Mr = 0.08*28 = 2.24 g mass of F = 7.2g so total mass = 7.2+2.24 = 9.44g RFM = 28+ (4*19) = 104 moles = 9.44/104 = 0.08 moles formed of SiF4
  16. gary221

    CHEMISTRY PAPER 3 DOUBTS HERE ....

    for ur thrd ques its stoichiometry calculate no of moles of F needed mass/Mr=7.2/(19*2) = 0.189 so 0.189 moles of F combine wth 2*0.08 = 0.16 moles of Si since 0.16 is less thn 0.189 Si is d limiting reagent!! dude if i helped dont forget to click the thanks button!!!! :D :D :D
  17. gary221

    CHEMISTRY PAPER 3 DOUBTS HERE ....

    for ur second ques first deduce the formula for the compound valency of Al = 3 and C = 4 so compound = Al4C3 frame d equation, Al4C3 + H2O = Al(OH)3 + CH4 now balance it 4 Al on the LHS, so add a 4 in front of the Al(OH)3 3 C on the LHS so add a 3 in front of the CH4 24 H on...
  18. gary221

    CHEMISTRY PAPER 3 DOUBTS HERE ....

    to find the formula we need to see how much of sodium phospate reacts completely wth the mateal nitrate according to d grph 6 cm3 of the phospate reacts completely wth 18 cm3 of the metal nitrate so 6:18 =1:3 so d formula 4 d metal phuspate will be 3 moles of metal T for 1 mole of the phospate...
  19. gary221

    Chemistey Doubts

    actually this is quite tricky!! u hve to divide the vol.by the time to get the rate so to get d 1st rate,vol = 48cm3 time = 20 s so rate = vol/time = 48/20 = 2.4 d 2nd one vol = 70-48 =22 time = 20 s =22/20 = 1.1 hope u got it!!
  20. gary221

    Chemistry paper 12 discussion!!!!!!!!!!

    so hw ws ur ppr,guys??? i found it ok, not so good or bad!! iknow wer nt spposed to discuss d ppr be4 24 hrs so i hope im nt breaking any rules!!! :D :D :D
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