POLL: How did you do in your EDEXCEL A2 Chemistry Practicals: Watch

Poll: How did you do in the practicals?
Very Good (A) (52)
60.47%
Good (B) (15)
17.44%
Average (C or D) (8)
9.3%
Bad (E) (2)
2.33%
Fail (F) (9)
10.47%
ArVi
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#61
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#61
(Original post by Jean)
I had 20 mins left after all the answering.
:ditto: I repeated the boiling point twice
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ArVi
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#62
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#62
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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ArVi
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#63
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#63
(Original post by Prometheus)
How can you distil ions?
You can't...
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Jean
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#64
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#64
i got pale green solid... :/
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ArVi
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#65
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#65
(Original post by Jean)
i got pale green solid... :/
What on earth could they have done at my school :mad:

When has an Fe2+ salt ever been yellow and given a yellow solution
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Jean
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#66
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#66
(Original post by ArVi)
What on earth could they have done at my school :mad:

When has an Fe2+ salt ever been yellow and given a yellow solution
Maybe it has oxidised.. You know, moisture and all those, so rusted. Could it be?
Maybe I'm talking nonsense..
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shimmerinapple
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#67
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#67
(Original post by genie k)
HEY SHIMMERINAPPLE I DONE THE SAME THING!!! AHHH I CNT BELIVE IT.
IT WAS BLUE WHEN I 1ST SAW IT SO I THOUGHT YEA ITS A KETONE. THEN AFTER THE END OF THE EXAM. THE TEACHER TOLD US 2 EMPTY THE SOLOUTIONS OUT. AND WHEN I WAS EMPTYING IT I SAW A RED PTT AT THE BOTTOM! N I WAS LIKE OHHH CRAPPPPPPP. N I COULDNT CHNAGE THE ANSWA AS THEY TOOK THE PAPER IN:mad:
Yea...i saw bits of red percipitate at the bottom.
Don't type in capital letters. :cool:
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saira2369
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#68
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#68
hey guyz........u rekon group 2 will b similar???
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"Hurricane"
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#69
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#69
(Original post by saira2369)
hey guyz........u rekon group 2 will b similar???
I guess it would be similar in concepts, but different techniques. Cuz the candidate slip was for both Group 1 and 2. Good Luck
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"Hurricane"
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#70
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#70
POLL: How did you do in your EDEXCEL Physics A2 Practicals?
http://www.thestudentroom.co.uk/showthread.php?t=232025
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"Hurricane"
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#71
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#71
(Original post by shimmerinapple)
Yea...i saw bits of red percipitate at the bottom.
Don't type in capital letters. :cool:
Mine was all red.:cool:
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reedahg
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#72
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#72
(Original post by Aburumman)
Well, for group 2 people, here are the questions:
Question 1:
Part A: Identify Fe2+. We did precipitation and oxidisation (H2O2) on it. We also used BaCl2 to identify SO4 2-.
Part B: Identify K+ by flame test and Cl- by pptation with AgNO3.

Question 2:
Part A: We did 2,4 DNP test, then we did Fehling's test, to identify aldehyde. We were then given mass spectrum analysis, result was propanal.
Part B: We did esterification to identify an alcohol. We then did oxidation by dichromate on it, result was positive, thus, it was a 1 or 2 degree. We were then given that it contains 1 more carbon than propanal, we drew the structure of the 2 isomers. Then we wre asked to write the reagents used to identify the isomers, I used the Iodoform.

Question 3:
We were asked to measure bp, I got 76 for rising and 77 for fall, thus the compound was ethyl ethanoate, inaccuracy was because bp values of compounds are close (difference of 2 degrees only), one source of inaccuracy was poor conductivity of water, improvement was by using fractional distillation.

Question 4:
Part A: Identifying 3 compounds (AlCl3, ZnCl2, NH3)=>EASY
Part B: Seperate between a mixture of ZnCl2 and AlCl3, you should get Zn2+ ions => Use simple distillation, Zn2+ as filterate.

Hope this helps group 1 and 2 ppl.
Good luck group 2.
I have my next exam on 15th of june, so im ready to help.
i think simple distaillation is wrong u must use sthg else!
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Mustard-man
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#73
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#73
(Original post by kingalan)
you oxidise the alcohols with acidified potassium dichromate...then add 2,4-DNP..then do silver mirror test....this is a correct way.......but they only gave us one line....i thought it musta bin sumthin short...and i ran outta time to write it...
Yes, I knew that had to be done, but I was sceptical as to why only one line was provided. Also the reagents bit was only worth a mark :eek: Dichromate + 2,4-DNPH + ammoniacal silver nitrate for one mark? I think not...
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"Hurricane"
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#74
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#74
(Original post by reedahg)
i think simple distaillation is wrong u must use sthg else!
Sorry, I meant simple fileration, ill edit it now.
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"Hurricane"
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#75
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#75
(Original post by Mustard-man)
Yes, I knew that had to be done, but I was sceptical as to why only one line was provided. Also the reagents bit was only worth a mark :eek: Dichromate + 2,4-DNPH + ammoniacal silver nitrate for one mark? I think not...
I think guyz they were already oxidised, because the previous question was to use K2Cr2O7, right???
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"Hurricane"
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#76
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#76
(Original post by Jean)
you can do the idoform test. the reagents are given in the user guide. secondary alcohol will give positive result as it has the -RCH(OH)CH3. primary will give you nothing.
Iodoform is a good answer, but I flipped the results (+ve for 1st degree)
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Mustard-man
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#77
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#77
(Original post by Aburumman)
I think guyz they were already oxidised, because the previous question was to use K2Cr2O7, right???
Oh sh******************t :banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead:

NOOOOOOOOOOOOO, are you really sure?

Fudge, that's 5 marks gone down the drain
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"Hurricane"
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#78
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#78
(Original post by Mustard-man)
Oh sh******************t :banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead::banghead:

NOOOOOOOOOOOOO, are you really sure?

Fudge, that's 5 marks gone down the drain
I guess, but I cant be sure till I see the markschemes.
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arxtra
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#79
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#79
those few group 2 ppl... how did u find it?

i thought it went smoothly.. basically questions 1, 2 and 3 were exactly the same as group 1 just with different, yet very similar solutions... so thanks to all u ppl who contributed **feels vry guilty** that i don better than i wud hav! .. still working on those reps btw..

the plan was weird (and a good one atleast in edexcel's eyes im sure) i would say i got maybe 4 out of the 7.. it shoulda bin easy and i had time but i did not think they would give NaCl instead of NaOH which threw me off a teeny bit... but of course that is always the purpose of those plans so any opposition shud not b tolerated :rolleyes:
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Abbas6
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#80
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#80
(Original post by myzt1kal)
those few group 2 ppl... how did u find it?

i thought it went smoothly.. basically questions 1, 2 and 3 were exactly the same as group 1 just with different, yet very similar solutions... so thanks to all u ppl who contributed **feels vry guilty** that i don better than i wud hav! .. still working on those reps btw..

the plan was weird (and a good one atleast in edexcel's eyes im sure) i would say i got maybe 4 out of the 7.. it shoulda bin easy and i had time but i did not think they would give NaCl instead of NaOH which threw me off a teeny bit... but of course that is always the purpose of those plans so any opposition shud not b tolerated :rolleyes:
I thought the first two questions and the bp question were, on the whole, quite good, although I made a complete pig's ear of a few of the tests... namely the ammonical silver nitrate test (turns out I over heated and so didn't get any silver mirror precipitate!!)

The planning questions were quite tricky and I don't think I did particularly well in those. I'm not really confident of getting more than 2/7 for Question 4...
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