Qualification > Sciences
IG Chemistry Paper 3 discussion
Kim:
--- Quote from: xTremep on June 02, 2009, 12:22:40 pm ---
--- Quote from: posten on June 02, 2009, 06:42:51 am ---1-WASHING THE PRECIPtate to remove impurities and get pure salt
2-heating in an oven to evaporate water and drying the salt
3-t3po4, because 18.0cm3 of T completely reacted with 6.0cm3 of po4 (from graph) there fore 18 is three times 6 .................
4-last page
i-the emperical formulae was Mg3N2
ii-silicon was limiting reagent
iii-0.08 moles
--- End quote ---
This is what i wrote exactly :) hope its correct
--- End quote ---
my moles was soo wrong
i got 0.095
cause i divided the value of f2 by 2
anyways themg2n3 taht is wrong cause u see after u get that u have to divide the values by the smallest which means 3/2=1.5=2 and 2/2=1 so the formuls mg2n(2 because u take the whole number)
zara:
the ques was about the limiting reagent....
n 0.09 moles is nt rite....its 0.08 moles...
i messed up in the T metal thing...maybe also abt chloropyll....i rote the answer but not sure abt it....
sweetie:
oops, i only rote dat flourine was in excess >:( any problem???
wa did u ppl rite in da 2 blanks?????
i rote carboxyl & hydroxyl
do u think it s rite? ??? :( :-\
zara:
the two blanks abt the acrylic acid??
well the answer was lactic acid and water
Kim:
i messed up in the moles the last part only luckily but u never know how much more i have messed up
and in the blanks i wrote acid and alcohol group
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