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Edexcel IAL Chemistry Unit 3 WCH03 May June 2016 Discussion

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Original post by ToxicPhantom007
Really ? I got around 41 %

Wasn't this like that ----> (1367.3-800)/1367.3 x 100= 41 %

Anyways this paper was so ****


yeh it was 41.49; 41% to 2 sig figs
oh god i said the major product was sulfur dioxide :frown:
-418kjmol-1
In the question for the test of an iodoalkane, can it be:
Test: add KOH in H2SO4.
Result: purple gases
???
-418 kjmol-1
Original post by AlonsoAMG
oh god i said the major product was sulfur dioxide :frown:


I said iodohexene :'(
Reply 26
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Mikaela1
What are the three changes u guys put for reflux to distillation? ☺
Reply 27
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Blazyy
3
Original post by eftio.gea
damn it i wrote down carbonate 😣


Even I wrote carbonate, when checking at the last few minutes I changed it to hydrogencarbonate because water vapour is only produced with hydrogen carbonates
I found the paper harder than the past papers. Also what did you get for the apparatus needed for simple distillation? And what value did you get from the graph for the 3 carbons?
Original post by AlonsoAMG
In the question for the test of an iodoalkane, can it be:
Test: add KOH in H2SO4.
Result: purple gases
???


if you add these they will neutralise ;D , it shouldve been add pcl5 then misty fumes will come out bc of HI
Original post by AlonsoAMG
yeh it was 41.49; 41% to 2 sig figs



Oh no i put the wrong value in! I put 450 instead of 800! :frown: Do you think a mark would be awarded for working at least?
Original post by Hamadtype-
What about the Anion in the first question what was it?

Hydrogen carbonate
Original post by don't cry-craft
I found the paper harder than the past papers. Also what did you get for the apparatus needed for simple distillation? And what value did you get from the graph for the 3 carbons?

-1200
Reply 33
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Blazyy
3
Original post by don't cry-craft
I found the paper harder than the past papers. Also what did you get for the apparatus needed for simple distillation? And what value did you get from the graph for the 3 carbons?


I wrote down beaker, thermometer and rubber bung. Not too sure about this

In the graph I think I got -1200 kj/mol
(edited 7 years ago)
Original post by don't cry-craft
I found the paper harder than the past papers. Also what did you get for the apparatus needed for simple distillation? And what value did you get from the graph for the 3 carbons?


I wrote Thermometer, stopper, and syringe , value was about 1200
Original post by Hamadtype-
if you add these they will neutralise ;D , it shouldve been add pcl5 then misty fumes will come out bc of HI


Isn't it add warm sodium hydroxide, then dilute nitric acid and silver nitrate solution and a yellow precipitate would be seen?
What's the test for iodine?
I said starch solution turns blue-black
Is this right?
Original post by Blazyy
I wrote down beaker, thermometer and rubber bung. Not too sure about this

In the graph I think I got -1800 kj/mol


Yeah I put conical flask instead of beaker. The value I got was around -1220
Original post by Electrify
What's the test for iodine?
I said starch solution turns blue-black
Is this right?


yh but dont know about the mark scheme
-418 Kj/mol
and 41%

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