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IG Chemistry Paper 3 discussion

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VIP_93:
Here r the answers susman:

1) 4 the first question we carry out the same experiment again 4 chlorophyll pure sample and measure the Rf value and then carry the chromatography of the green solution and also measure the Rf values 4 the spots. see which Rf value matches with chlorophyll or is at the same height as the pure chlorophyll dot.

2) i did metal phosphate like u susman T3(PO4)2 but i had a different xplanation.

3)the graph of ammonia is inverse

4)in the exo thingy i added the first 2 bond energies and then subtracted (2*last bond energy) from it

5)groups in lactic acid are alcohol and carboxylic acid.and the compound which contains this type was fats or esters

6)in the PLA i wrote its biodegradable and doesnt give out toxic fumes like petrol
 
WAT IS THAT INDICATOR question u r discussing?
if it is that ques that has 1 mark then PH meter AND indicator are correct ;)

chakrit_m:

--- 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 ---

Same answer 555

amy.mym:
No indicator is wrong

It was stated in the question " Other than an indicator "

So I guess a test will be fair

and for the exothermic thing

Guys you don't do that multiplication thing

I actually studied this particularly for the IGCSE Course

You add the bonds for H---H and F----F that are stated

You add them and the no. will be higher than the H----F in the table, so if it is higher than its exothermic

I studied that from an IGCSE book specially designed by Cambridge

Triple_A:
Damn......i wrote metal T was lead so it becomes Lead Phosphate!!>>>>>>>>STRANGE RIGHT
Also i did describe how it formed :-X
Hope I did Well
aquarian93@ how come u wrote pH meter and he said beside using indicator!!
To measure pH u must add universal indicator right?!!

VIP_93:
i thought u were talking abt another ques
if it is the test 4 organic acid then ya indicator is wrong, i wrote adding a carbonate, it will give effervacences that will turm lime water milky

i thought u r talking abt another ques, the one were they want us to differentiate between the strong and weak acid

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