Qualification > Sciences
IG Chemistry Paper 3 discussion
omar777:
man i really hope the physics is easier... so that if i get an A* ill show it my parents first ;D maybe it'll get their mind off the chemistry mark
persian17:
Just to clear the T metal question.....IT CANNOT BE A GROUP ONE metal since it forms a percipitate..the metal is Al3+....answer is TPO4....actual equation Al(NO3)3 + Na3PO4 ? AlPO4 + 3NaNO3...search it on google and see
ADIN:
what you say is true. but can some1 plz tell me why fractional distillation is wrong for the first question. i had initially drawn a chromatography diagram but rubbed it out. they did not specify that the pigments have the same boiling point; for some reason i assumed they were different. plz answer this
qwert101:
--- Quote from: persian17 on June 02, 2009, 08:25:24 am ---Just to clear the T metal question.....IT CANNOT BE A GROUP ONE metal since it forms a percipitate..the metal is Al3+....answer is TPO4....actual equation Al(NO3)3 + Na3PO4 ? AlPO4 + 3NaNO3...search it on google and see
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if this is true, i put alp04, this will probably the guess of the century!!!!!! :P
horror:
--- Quote from: qwert101 on June 02, 2009, 06:51:07 am ---
--- Quote from: sweetest angel on June 02, 2009, 06:49:06 am ---
--- Quote from: horror on June 02, 2009, 03:18:22 am ---
--- Quote from: Wahab09 on June 02, 2009, 12:42:34 am ---"for the indicator question..i wrote pH meter........i know it's wrong..but at least i wrote something...who knows..i might get it right anyway.......and for the Aluminium question i didnt balance it...so i think i got 1 for a non balanced equation instead of 2..."
dude.. dip a pH meter is 100% correct..!
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Its 100% wrong PH meter is an indicator .they said how would you test if the 2 something is acidic without an indicator ....test: add any metal sodium for example ...results: hydrogen gas revolves....-rep me if am wrong and +rep me if am right :D
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I ADDED A CARBONATE: GAS GIVEN OFF WHEN PASSED THROUGH LIME WATER TURNS IT MILKY...EH?
AND FOR THE BOND ENERGY ITS PRODUCT ENERGY _ REACTANT ENERGIES NT DA OPPOSITE
THUS POSITIVE ANSWER 'N RXN IS EXOTHERMIC!!
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negative answer is exothermic and I also said carbonate- if u said metal or metal oxide it would also react with water hence not correct ;)
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The exact question if am not mistaken is "describe a test other than the use of indicator to show that both chemicals belongs to an acidic group <----I don't see no water in the question so the test is by reacting a metal and the result is hydrogen gas revolves am sure of the answer i've discussed the queston with my chemistry teach am definately right :)
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