Qualification > Sciences
IG Chemistry Paper 3 discussion
Kim:
--- Quote from: IGCSE nightmare on June 02, 2009, 12:03:30 pm ---What makes you so sure ?!?
By the way I wrote that too but many are saying it's T3PO4
--- End quote ---
believe me none of us are sure of our answers and dont worry I m sure we all will get marks that question was like wat 3 martks?so i m sure they will giv us 2 for nearly gettin our answers!!!!!!!!!!!!!!!!!!!!!!!!hehehe
sweetie:
wa did u rite 4 da properties of Cao
i rote 1) it is basic
2)it is soluble in water
and 4 the excess que. i got flourine
do u think mi answers r rite??????????????????
xTremep:
--- 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
sweetie:
was da qus bout the one in excess or da limiting reagent????????????
mr3bood:
"Fluorine was in excess and silicon was the limitin reagent....
0.08 was the no of moles....cz the product is the same as dat of the limitin agent...dats wat i read in the txt bk..."
Yup!..i wrote silicon was the limiting reagent...........and for the very last question...i wrote 0.09 moles...!....hope its right...
I totally screwed up my exam!!....i think i'm going down to a C/D now...
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