HOW WAS CHEMISTRY P42 MAY/JUNE 2017 (POLL)

[techgeek]

what! are we supposed to put the charges?

no no I don't think so..
plus I just used 'en' instead of the whole bidentate ligand name, so it was much simpler to draw than this

 

[darks]

no no I don't think so..
plus I just used 'en' instead of the whole bidentate ligand name, so it was much simpler to draw than this

ummm werent we supposed to use n------n kinda representation that the paper stated to use? also i got trans exactly right. But the optical one, shift the entire structure (left one) 1 position anticlockwise.... can i hope for at least 2 marks from for drawing mirror image... also if mine is wrong then why?...

 

[Metallic9896]

what! are we supposed to put the charges?

I didn't put charges now whattttt

 

[darks]

I didn't put charges now whattttt

I think not much issue with charges as we have to just show 3d structure... do you thing what i said on above post is correct? rotating 1 step anticlockwise in the cis structure on the far left.. And 2nd structure its mirror image... i mean its.. 2 planes for Cl

 

[Metallic9896]

I think not much issue with charges as we have to just show 3d structure... do you thing what i said on above post is correct? rotating 1 step anticlockwise in the cis structure on the far left.. And 2nd structure its mirror image... i mean its.. 2 planes for Cl

Oh yes I think that's fine mine was also pretty "rotated". I think that won't matter as long as the structure is correct.

 

[darks]

Oh yes I think that's fine mine was also pretty "rotated". I think that won't matter as long as the structure is correct.

That feels goood

 

[MariaKhan243]

It was a tough paper. The 10 mark organic Q i got most wrong.. Expected gt around 62-63

The 10 mark one? The paper 3 tests one?

 

[MariaKhan243]

Keq3= kstab2/ kstab 1
lattice energy was -2280 KJ
Delta G was -111.92
Delta H was 8
PH of amino acid was 5.43

Yesss thankss
Atleast i got this right

 

[MariaKhan243]

CIE has confused our entire life

Trueeee
Whats the point of seperating chem into a level and as level when they bring as into a2??? What do they get by torturing us.. i studied every single part of A2 chem and surprise surprise they brought AS chem

 

[MariaKhan243]

nmr peaks,, 4,3,2

For what??? There was no nmr

 

[MariaKhan243]

CIE be like...

Head examiner: OK ladies and gentlemen, how do we f*** up the candidates this time?
Examiner 1: Let's test the sh*t out of AS organic chemistry. Tests for halogenoalkanes anyone?
Head examiner: *chuckles* Let's see them b*tches remember that!
Examiner 1: Why don't we make a big ass table with AgNO3 / NaOH + HNO3 tests right in the beginning? That'll stop 'em from making the organic compounds since they don't remember the tests anyway!
Head examiner: You my buddy, ARE MY NEW BEST FRIEND!!
Examiner 3: Isomers! ISOMERS PLEASE!! CAN WE HAVE ISOMERS DADDY ?? I LOVE ISOMERS!
Head examiner: Ok ok calm down man we'll get it done geez...
Examiner 2: I know! Let's f*** up the equilibrium constants!
Examiner 3: On that note, we should f*** up the maths! Anyone up to make a weird a*s algebra question?
Examiner 2: Let's throw in some AS inorganic too!
Examiner 4: How about we leave out analytical chemistry and electrochemistry? That'll be a slap to all them stupid ass guess papers!

Head examiner: I f***ing love my job. Can't wait to write that examiner report on this one!

Now i really feel like they actually do this

 

[MariaKhan243]

Why were all the paper 4 hard this year

 

[MariaKhan243]

Guess my chances of going into medical are

 

[MariaKhan243]

Does anyone know how to calculate pH of amino acid?

Yess... pka was given u find ka H+=square root ka×conc pH=-logH+

 

[darks]

For what??? There was no nmr

We are talking about p42... there was a small portion of carbon-13 nmr.. the peaks for me were 4,3 and 2 for the question.

 

[ALevel2017KID]

Mr was 81

I got 81 too
It's because we wrote our product as NaHSO3
Technically, that product isn't wrong, but then I didn't get an acid corresponding to Mr 81, so I'm guessing that's gone all wrong.
6 marks outta the window urgh
Here's hoping they at least consider something out of it

 

[Metallic9896]

I got 81 too
It's because we wrote our product as NaHSO3
Technically, that product isn't wrong, but then I didn't get an acid corresponding to Mr 81, so I'm guessing that's gone all wrong.
6 marks outta the window urgh
Here's hoping they at least consider something out of it

Exactly. The reason why our product is wrong though is as my friend pointed out that they emphasized that Na is in excess. So even though NaHSO3 would be formed the final product would be Na2SO3. We missed the 'excess' part. :/

 

[darks]

Exactly. The reason why our product is wrong though is as my friend pointed out that they emphasized that Na is in excess. So even though NaHSO3 would be formed the final product would be Na2SO3. We missed the 'excess' part. :/

i wrote Na2SO3...
first part moles : 0.0162
2nd part: 0.00540
mr:185 (Wrong)
molecular formula :C11H21O2 (Wrong or ecf idk)
are the moles at least correct for me?

 

[Irfanhaider0533]

First part moles were 0.0246

 

[darks]

First part moles were 0.0246

how?? i did something like this:
first mol NaOH that react with HCL... 0.0054..
then double that reacts with SO2...0.0108
sum=0.0162