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Edexcel A2 Chemistry 6ch04/05 JUNE 2015

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Reply 1460

MoHoosen9167

Original post by Nautic4l

You liked my OH answer, did you get that too?

What page btw?

For GF, page 177

Reply 1461

bmunro

Original post by Callum_Stewart

For everyone confused about the reaction in step three: http://wwwchem.csustan.edu/consumer/aspirincons/aspirincons.htm
It WAS esterification, they use acetic anhydride, which is the industrial way of adding an acyl group on, which is an esterification reaction.

But it said what type of reaction? So would saying it was a condensation reaction get marks?

Reply 1462

neverstop

Original post by MoHoosen9167

Well it said that 40% of the moles were N2O4 which means that the mole fraction was 4/10, therefore the other one HAD to be 6/10 because ∑MF=1 :smile:

Ah yes ! I didn't use the 10 moles oF 2NO2 , but yeah makes sense

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Reply 1463

Wahid1

Original post by bmunro

But it said what type of reaction? So would saying it was a condensation reaction get marks?

Esterification is a type of reaction

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Reply 1464

MoHoosen9167

Original post by Wahid1

Yeh so wouldn't it be 4/10 and 6/10 times 2 for pp giving 0.8?

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Yeah, I was talking about mole fractions. It was (0.4x2)/(0.6x2)^2 = 0.5rec which rounds to 0.56

Reply 1465

Infamous7

Original post by Wahid1

Yeh so wouldn't it be 4/10 and 6/10 times 2 for pp giving 0.8?

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nope. you had to multiple the mol fraction by the total pressure first

Edit:unless you did do the partial pressures, in which case my bad :P

Reply 1466

MoHoosen9167

Original post by Nautic4l

What do you reckon that would be? I'm hoping for that too. There's a lot of disagreement between answers and some we can't even remember so we shouldn't worry too much. What grade are you hoping for btw?

Ideally I want an A, and I re-sat units 1 and 2 and got like 68 in both of those I think... I think this paper will be like 68 for an A, in which case I should either get a B or an A. :/ what about yourself?

Reply 1467

Shadowlunar

How is everyone going to prepare/revise for unit 5??

Reply 1468

MoHoosen9167

Original post by Shadowlunar

How is everyone going to prepare/revise for unit 5??

Potassium Cyanide pill embedded in my tooth and bite down hard if the paper is anything less than perfect.

Reply 1469

Wahid1

Original post by Infamous7

nope. you had to multiple the mol fraction by the total pressure first

Edit:unless you did do the partial pressures, in which case my bad :P

Yeah! Which was 2atm

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Reply 1470

Nautic4l

Original post by MoHoosen9167

For GF, page 177

Original post by Infamous7

yeah I got the OH answer. It had to be because KCN was there to trick ppl, as OH would react with H+, forcing further dissociation levels of that equilbrium. :smile:

Yay thank you!

And yes it says O2 in george facer which is the edexcel book itself so I believe that over anything else. Answer was CO2

Reply 1471

frozo123

Original post by Infamous7

yeah I got the OH answer. It had to be because KCN was there to trick ppl, as OH would react with H+, forcing further dissociation levels of that equilbrium. :smile:

please tell me it was 1.8-3.0

Reply 1472

Wahid1

65 for A or less?

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Reply 1473

MoHoosen9167

Original post by Nautic4l

Yay thank you!

And yes it says O2 in george facer which is the edexcel book itself so I believe that over anything else. Answer was CO2

So you're saying I got the answer right, because CO2 was the unsuitable one? YAY <3

Reply 1474

Wahid1

Original post by frozo123

please tell me it was 1.8-3.0

Lol

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Reply 1475

MoHoosen9167

Original post by Wahid1

65 for A or less?

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Thought it'd be around 68 tbh, not because I did well or stuff just because I thought people found it easier?

Reply 1476

Shadowlunar

Original post by MoHoosen9167

Potassium Cyanide pill embedded in my tooth and bite down hard if the paper is anything less than perfect.

sounds likes a good idea.

Reply 1477

Nautic4l

Original post by MoHoosen9167

You resat them this year didn't you? Are you guessing 68?

I just need a B in this and A in Bio to meet my offer. Hopefully I've done the Bio but I really want an A in Chem because I know I'm capable.