Qualification > Sciences
IG Chemistry Paper 3 discussion
ETCH:
i got 1 since they gave us conc. and volume so i calculated no. of moles and wrote a balanced ionic equation it was somethin like this 18T+6P04=6T3p04
killzone:
--- 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*?...
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1) i think u should put the pure sample of chlorophyll in the pencil line a long with a sample from the green solution ,, the pure sample cuz its pure is gonna give one spot on the paper, but the green solution is gonna give many so if there a spot that matches the spot of the pure sample that means that it actually contains chlorophyll.
2) chlorophyll traps sunlight need for the process
it also acts as the catalyst for the reaction
it also gives the plant its green color
horror:
--- Quote from: Shogun on June 02, 2009, 04:14:51 pm ---
--- Quote from: horror on June 02, 2009, 04:10:44 pm ---
--- Quote from: horror on June 02, 2009, 04:08:49 pm ---
--- Quote from: notty_me on June 02, 2009, 04:01:47 pm ---hiiiiiiiiii every1
shogun can u tell me the formula u got 4 da phosphate?
all da best 4 da rest of ur xams
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Its K2PO4 :)
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lol i got P3PO4 it cant be p2 cuz the valency of p4 is 3
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I've discussed the question with my teacher and she said that its K2PO4 ....potassium displaces sodium from it salt because potassium is more reactive than sodium. :D
Shogun:
even i thought its potassium.. but isnt the valency of the radicle phosphate is 3....
hdbkiwi:
--- Quote from: horror on June 02, 2009, 05:31:08 pm ---
--- Quote from: Shogun on June 02, 2009, 04:14:51 pm ---
--- Quote from: horror on June 02, 2009, 04:10:44 pm ---
--- Quote from: horror on June 02, 2009, 04:08:49 pm ---
--- Quote from: notty_me on June 02, 2009, 04:01:47 pm ---hiiiiiiiiii every1
shogun can u tell me the formula u got 4 da phosphate?
all da best 4 da rest of ur xams
--- End quote ---
--- End quote ---
Its K2PO4 :)
--- End quote ---
lol i got P3PO4 it cant be p2 cuz the valency of p4 is 3
--- End quote ---
I've discussed the question with my teacher and she said that its K2PO4 ....potassium displaces sodium from it salt because potassium is more reactive than sodium. :D
--- End quote ---
It can't be K2PO4
PO4 is 3-
K is +1
phosphates form with ferrous metals, the most likely candidates being iron or nickel
it was a 2+ metal as the precipitate height was twice that of the volume used (although thinking back now did the concentration work out to 1 mole??? urgh)
^^
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