Aqa chem 4/ chem 5 june 2016 thread

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Im guessing that lidocaine is more soluble compared to the salt which is actually can be injected or used like a cream as it is less soluble

i agree

i put that!!

Reply 1181

livvvmonster

HAHAHAH who else just failed that severely like me

(edited 7 years ago)

Reply 1182

FormlessBowl

Original post by Mo2351

The propanoic acid accepts a H+ and the nitric acid becomes NO3-

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I had HNO3 + ethanoic acid -> NO3- + H2O + CH3C+O

(Pretty sure it was ethanoic)

Reply 1183

emsieMC

What do people think about grade boundaries? Harder or easier than last year?

Reply 1184

Boundless_x

Original post by nautella

mate, it is 9. Student room is a dangerous place to go straight after an exam.

Yayyyyyy

and true

Reply 1185

Weeksy97

Original post by PaddysChemistry

Anyone get OH-CH2-CH2-C(CH3)2-O-CH3 for 9?

Yes, I got this and I believe it's correct! 😀

Reply 1186

Ginpls

Original post by Mo2351

The propanoic acid accepts a H+ and the nitric acid becomes NO3-

Posted from TSR Mobile

I put ch3cooh + hno3 ---> h2o + ch3ch2coo- no2+
Is that right ????

(edited 7 years ago)

Defo 9 peaks

Original post by Mo2351

Can't be a tertiary alcohol it clearly stated that when K2Cr2o7 was added it went from orange to green

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I got a primary alchahol

Reply 1189

minjinoor

Original post by Cadherin

It was a hydroxy ether I'm afraid.

hydroxy ether?!?!! bloody hell

btw you seem very sure of things - can you link/make the unofficial mark scheme if you have it???

Reply 1190

RedNebula

Original post by A2ScienceGuy

I got (CH3)2CH-CH2-O-CH(CH3)-CHOH for the last structure. The middle may be the wrong way around, as I can't remember, but I put the primary alcohol on the end and a di-methyl group on the other. Did anyone get the same?

You have 7 carbons in that? I thought it was only supposed to be 6?

Posted from TSR Mobile

Reply 1191

Engineerrookie

I don't know why but I said the positive nitrogen meant more polar more likely to stay in the body for longer?

Reply 1192

willyg98

unofficial mark scheme ?

Reply 1193

Anno007

Original post by cowie

ImageUploadedByStudent Room1465921486.693938.jpg

I thought there had to be a group like this?

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There did have to be. That's why it was HOCH2COCH2CH(CH3)2

Reply 1194

Louiseelg0rt

Original post by ishabennett

Seriously I think it's worth it because usually there's on a few questions that require a lot of time. Almost every question in the paper required a lot of time and thinking. I couldn't concentrate on the questions themselves because I was scared of running out of time. It was an unfair paper. I've done every last paper twice and nothing compared to that paper today

agree!
especially the last question, the layout of the question 9(b) had no sections so timing became an issue. The lack of time made it so much harder to check previous questions and focus.

Giving us a new layout of questions on the day of the exam is unfair because we haven't been tested in that format before?? I feel like my anxiety because of time pressure got the best of me and don't feel that my working is representative of what I'm capable of. :frown:

Guess we've just got to focus on unit 5 now though.

Reply 1195

lahigueraxxx

Original post by Weeksy97

Yes, I got this and I believe it's correct! 😀

This is also what I got - it should be right! No reason for it not to be

Reply 1196

Weeksy97

Original post by emsieMC

What do people think about grade boundaries? Harder or easier than last year?

I think a bit harder, as there were lots of questions to trip people up!
I predict:
A* = 83
A = 75/76

Reply 1197

Suits101

Original post by Revision King98

Are u sure about the p and q one????? Cus I put Agno3

P and Q may be the other way around but yes.

Reply 1198

qwerty123A

for distinguishing between one compound and the acyl chloride i said use NaHCO3 and with the acyl chloride you get effervescence and no visible change with the other, is that correct?