All Chemistry A2 students, the planning question this summer... Watch

"Hurricane"
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#161
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#161
(Original post by Mustard-man)
Yellow????!!??

The solid + water gave a colourless solution (Fe(H2o)6)2+
Add excess NaOH gave an insoluble green ppt. which darkened on exposure to air.
Add H2O2 gave a brown ppt. Fe(II) had been oxidised to Fe(III)
It was H2O2 which oxidised it.
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Smashingdude
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#162
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#162
Arvi u wont loost marks for the first part. Fe2+/3+ both look same so u really shud have written both. But u wrote the inferences, as far as i think, correct.
And yeah it was ethyl ethanoate.
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Kieny
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#163
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#163
(Original post by Smashingdude)
Easiest practical guys. I cudnt believe they gave KCl to identify. And the first one really was Fe+2 ions. Organic was simple. And plan rocked. They made life easier by giving NaOH.
It simply rocked. The boiling point was so damn accurate. My sample must have been 100% pure. It came to exactly 77(77 up, 76.5 down). And my teacher said this was the reading supposed to get,
Awesome paper.

AMAZING!!!

I cant see where i dropped any marks at all



Bpt: 78 going up - 77 going down

YEEHA! 1st Bpt i've ever got right in my LIFE!
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RMIM
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#164
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#164
(Original post by Mustard-man)
Yellow????!!??

The solid + water gave a colourless solution (Fe(H2o)6)2+
Add excess NaOH gave an insoluble green ppt. which darkened on exposure to air.
Add H2O2 gave a brown ppt. Fe(II) had been oxidised to Fe(III)
I wrote Fe(II) Fe(III). I forgot to write the word 'to'? will I loose marks?
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shihab
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#165
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#165
anyone have any idea for the group two questions pls help man....in dire need
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Mustard-man
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#166
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#166
(Original post by RMIM)
I wrote Fe(II) Fe(III). I forgot to write the word 'to'? will I loose marks?
I don't think so........ depends on how mean the marker is
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Jean
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#167
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#167
(Original post by mambojambo)
How was it? What exactly came out? Jean, the paper you did was Group 1 is it?
Yup, my paper was group1!

Well, I guessed everybody had talked about what came out, so there's nothing for me to say anymore.

But, KCL??! I got a red flame.. Hmmm..

and, usman, u r not doing group1?
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ArVi
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#168
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#168
Compound A - which was later identified as FeSO4 - What colour was this? Shouldn't it have been either white or pale green. At our school all the samples were bright yellow and dissolved to give a bright yellow solution :mad:

If Edexcel sees consistency in all the scripts from our school, will they give marks if we initially identified it as Fe3+ (becuase it was yellow)?
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fizzerz
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#169
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#169
I'm realllllly confused... I don't have MY practical until tomorrow, but still got the same briefing sheet thing as all of YOU guys that have had it today... does this mean I will have the same paper as what you did today?!

oh and im glad it went well for everyone
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doublesided
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#170
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#170
what board are you on? Someone email the edexcell paper to tina! Oh and the OCR one will be online very soon!
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fizzerz
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#171
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#171
edexcel, group 2 (i think)
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ATESalisbury
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#172
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#172
What do you think will be changed for the planning question tomorrow? I think maybe Nickel instead of the Zinc?
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=Keith=
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#173
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#173
No im in group 2 Jean..
Ok congrats to everyone hu did the chem group 1 pracs today.. Hope u guys get the maximum mark
Mine is tmrw..and i hope its as easy as the practical u guys had.
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shihab
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#174
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#174
yo usman do you have any whts gonna come tomm.?
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orangemonkey
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#175
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#175
i think it will be lead(II) instead of aluminium for the planning
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shihab
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#176
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#176
hey monkey man can u telll me the limitations in the a boiling temp exp?
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ATESalisbury
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#177
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#177
monkey - whats your reasoning behind the idea that tomoro we're gonna get lead (II) instead of Al
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orangemonkey
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#178
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#178
limitations and problems of boiling point are:
- poor conductivity of water
-not enought stirring
-heating too rapid
-difficult to judge flow of bubbles

and my reasoning is that both lead(II) and aluminium have the same tests with respect to NH3 and NaOH

hope this helps
why did u think it would be nickel instead of zinc taanya
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angeleyes2
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#179
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#179
yee i think lead is a possibility and aluminium using nh3 and that.......do u think we r likely to get tollens reagent seeing as gp1 got fehlings
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orangemonkey
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#180
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#180
yeah tollens or even iodoform cos it might be a ketone
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