Qualification > Sciences
IG Chemistry Paper 3 discussion
Triple_A:
For the pure chlorophyll sample...how to check if grass contained chlorophyll
i wrote:"Apply pure sample of chlorophyll on chromatogram paper and place in solvent,allow to rise and then match the dyes with tht of grass sample...!! Is tht correct?!!!!
sweetest angel:
--- 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..!
--- End quote ---
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
--- End quote ---
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!!
sweetest angel:
--- Quote from: Triple_A on June 02, 2009, 06:48:05 am ---For the pure chlorophyll sample...how to check if grass contained chlorophyll
i wrote:"Apply pure sample of chlorophyll on chromatogram paper and place in solvent,allow to rise and then match the dyes with tht of grass sample...!! Is tht correct?!!!!
--- End quote ---
its refrence chromotography so urs is soo close 'n yeh may b correct
qwert101:
--- 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..!
--- End quote ---
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
--- End quote ---
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!!
--- End quote ---
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 ;)
sweetest angel:
--- 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 ---
yup all those r rit i tink...although i got da MG1.5N1
i knw u cnt gt a decimal ....am sooo stupidish :(
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