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

I had 20 mins left after all the answering.

How can you distil ions?

i got pale green solid... :/

What on earth could they have done at my school

When has an Fe2+ salt ever been yellow and given a yellow solution

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

hey guyz........u rekon group 2 will b similar???

Yea...i saw bits of red percipitate at the bottom.
Don't type in capital letters.

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.

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...

i think simple distaillation is wrong u must use sthg else!

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 Dichromate + 2,4-DNPH + ammoniacal silver nitrate for one mark? I think not...

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.

I think guyz they were already oxidised, because the previous question was to use K2Cr2O7, right???

Oh sh******************t

NOOOOOOOOOOOOO, are you really sure?

Fudge, that's 5 marks gone down the drain

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