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Aqa chem 4/ chem 5 june 2016 thread

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Original post by Ebaysass
Yep White Ppt of Agcl


I said white precipitate for the acyl, nothing for the one directly bonded to a methyl
Original post by girl :D
i wrote the same reagent but i wrote effervescence for acyl chloride


I put same as you 😊
I put ammonia for the test for acyl chlorides to give misty fumes
Reply 863
Avatar for tsred
tsred
2
what's the hydrogen percentage and the peak for that question
Original post by oweneagle
i think it's supposed to be add water and the white misty fumes of HCl are evolved, both of the compounds had chlorine in, i didn't put that but it's what my friend said


Oh fudge! Well i said both H20 and Agno3 so should be fine!!
For step three would it be right if you put nabh4 instead of lial4
Original post by MrSmashface
Yeah fully dissociates, Ka would be infinite (you would be dividing by 0)


No equilibrium established so no KA values . fully dissociates
What was the mechanism for the acetate? Nucleophilic addition?
Original post by FireBLue97
0 and 2 for rate


I got that.

Original post by bluhbluhbuh
guys pls what is ethanoic acid + nitric acid, where ethanoic acid acts as a base pls halp


CH3COOH2+ + NO3-
unofficial marksheme?
what did u guys put for the oder of E and F
Reply 871
Avatar for idk97
idk97
1
Original post by Sani Ej
For the rate equation i put the same as the one they gave us i thought it had no effect :frown:


i put this as well! is it right?
Original post by K2Cr2O7
I put H2O.
haloalkane - no change
Acyl chloride - misty fumes
???? not sure though


Yep, same.
Hey guys Ive made a post and poll. feel free to contribute to it. http://www.thestudentroom.co.uk/showthread.php?t=4164897
Also please discuss your answers there so I can compile an unofficial markscheme
Original post by AliRock
Bingo.


how many marks will i get if i got the observations correct but reagent wrong? D:
Original post by girl :D
what did u guys put for the oder of E and F


1 then 2 i think
Original post by tsred
what's the hydrogen percentage and the peak for that question


9.4 for hydrogen
Original post by thehollowcrown
i said chromatography too mate, couldn't think of anything else apart from filtration and i didn't think that was right


fractional distillation alcohol not amino acid
Reply 878
Avatar for tsred
tsred
2
Original post by the1pedro
I put same as you 😊


I put simple Tollens' reagent for this one.... Is it not possible
Original post by Ejsjwwj
For step three would it be right if you put nabh4 instead of lial4


No, sorry.

Original post by girl :D
what did u guys put for the oder of E and F


D: zero
E: second

People are in agreeance with E, but D people are getting 1/0 so I don't know.

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