Edexcel A2 Chemistry 6ch04/05 JUNE 2015

Original post by cerlohee

I put cyclohexanol and it was microwaves, cos polar
Also got 4 before the 0.56 question
Also I got 12.0 for the pH?
+ What were your three points for the pH>7 question

I was like: ∆H is +ve, therefore an increase in temperature would shift the equilibrium to the right, making the value for Kw larger. pKw would decrease as it is a negative log, so the pH would decrease too. Therefore, he is incorrect.

Reply 1424

pilebunker

8

Original post by Wahid1

I put hexane

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Same...the answer was hexanol though I think

Reply 1425

neverstop

2

Original post by rasil23

Mine says the opposite. :redface:

And for constant calculation i got 0.56

Yeah 0.56 and the first part was 4.

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Reply 1426

Original post by neverstop

George facer textbook or revision guide ? I put same as you and said Carbon dioxide inappropriate

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Textbook

Reply 1427

HappyCheesecake

8

Original post by cerlohee

I put cyclohexanol and it was microwaves, cos polar
Also got 4 before the 0.56 question
Also I got 12.0 for the pH?
+ What were your three points for the pH>7 question

Ahh, well. Cyclohexane was a guess so not surprised that was wrong. Did you round your values throughout the pH question? I didn't, so maybe mine was lower :/ A lot of people got 12.0 though.
For the three points, I put:
- titrating weak acid with strong base
- strong base ionises fully whereas weak acid doesn't
- hence more OH- ions in solution so slightly higher pH than 7.
No idea if this is right though :/

Reply 1428

frozo123

Alright Multiple Choice questions

-2601
-12 ( I can't remember )
4
0.56
KOH
Z2chloro
Cyclohexanol
2 methylcyclohexane
Oxygen ( Cofirmed is correct )

pH
12.0
Ph does change of water

Rate=k(A)(X)
k=0.21
tonnes=3.1
The biodiesal catalyst anything OH

Section C:
delta H -311
System= -567

nmr thing:
triplet, quartet,
1.8-3.0
10.0-12.0

Reply 1429

Original post by neverstop

Yeah 0.56 and the first part was 4.

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Hahah I spent ages on it then I realised that they'd told us the MF! First I tried doing it with 1 mol NO2 and 0 mol N2O4 initially, and then I wound up with an answer that wasn't there! I must have spent about three minutes on that question then kicked myself when I got it ahaha

Reply 1430

frozo123

Original post by MoHoosen9167

I've literally got George Facer open right now and it says:

"The carrier gas can be Hydrogen, Argon, Oxygen, Nitrogen or Air,"

Therefore, CO2 is unsuitable, as CO2 would be present in Air just not a lot of it. Whereas pure Oxygen is allowed.

Lol in my book it says CO2 is suitable?

suitable gases are: " nitrogen, helium, argon, CO2 " in the Ann Fullick book

Reply 1431

Original post by frozo123

Lol in my book it says CO2 is suitable?

suitable gases are: " nitrogen, helium, argon, CO2 " in the Ann Fullick book

Ann Fullick is renown for her mistakes, check the lack of a negative sign on the Arrhenius equation plus Boron Trifluoride having Gallium as the central atom (in AS).

Reply 1432

Wahid1

7

Original post by HappyCheesecake

Ahh, well. Cyclohexane was a guess so not surprised that was wrong. Did you round your values throughout the pH question? I didn't, so maybe mine was lower :/ A lot of people got 12.0 though.
For the three points, I put:
- titrating weak acid with strong base
- strong base ionises fully whereas weak acid doesn't
- hence more OH- ions in solution so slightly higher pH than 7.
No idea if this is right though :/

That's EXACTLY what I wrote haha

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Reply 1433

neverstop

2

Lol wtf is the answer to the suitable gas . Knowing edexcel , the most right answer will be a gas that isn't even on the bloody question paper !

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Reply 1434

Nautic4l

Original post by MoHoosen9167

I've literally got George Facer open right now and it says:

"The carrier gas can be Hydrogen, Argon, Oxygen, Nitrogen or Air,"

Therefore, CO2 is unsuitable, as CO2 would be present in Air just not a lot of it. Whereas pure Oxygen is allowed.

OMG YAY +1 MARK

I swear you keep making my day better since before the exam lol

Reply 1435

frozo123