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IG Chemistry Paper 3 discussion

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sweetest angel:

--- Quote from: abdulrahman101 on June 01, 2009, 10:39:57 pm ---
--- Quote from: mr3bood on June 01, 2009, 10:30:22 pm ---what about the chlorophyll question?....the first one where it says *how can you show that this green solution contains chlorophyll*?...and the second one that has 3 marks!...*expain the role of chlorophyll*?...

--- End quote ---

u add iodine it turns black, i wrote stuff like photosynthesis, and gives it its colour, and absorbs light etc, last time i read bout chlorophyll was years ago lol

--- End quote ---
for the chlorophyll u were supposed 2 do reference chromotography nt an idone test.
its chem nt bio plus chlorophyll dsnt hve starch thus dsnt turn iodine into anytin' !!
-__-"

posten:
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

posten:
he said beside using indicator
so u should add a carbonate like calcium carbonate bubble the gas produced through lime water turns milky white

amy.mym:
 
--- Quote ---plus chlorophyll dsnt hve starch thus dsnt turn iodine into anytin' !!0
--- End quote ---

exactly LOOOL

VIP_93:
for the bond energies they were H----H and F----F and 2H----F
we add the bond energies for H----H and F----F
then we multiply 2 by H----F
then we subtract (H----H + F----F)- (2*H---F)
the ans will be negative

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