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OCR F324-June 2013 Chemistry

Reply 2660

Sinkim

Do i need to know how terylene, kevlar, poly lactic acid and nylon6,6 are made?

Reply 2661

simifeltham

Compound A has a aldehyde group that gets oxidised to COOH by tollens reagent.

Reply 2662

_HabibaH_

8

Original post by otrivine

Thank you

OMG! I dont know what else I can do :s-smilie:

Lol same. I'm literally just sat here going through this thinking maybe I should be recalling stuff instead of discussing on here and then I'm like 'forget that, this is more fun'.

Reply 2663

simifeltham

Original post by Sinkim

Do i need to know how terylene, kevlar, poly lactic acid and nylon6,6 are made?

They will give you the monomers and ask you to draw it at most nothing special

Reply 2664

otrivine

OP

14

Original post by _HabibaH_

Lol same. I'm literally just sat here going through this thinking maybe I should be recalling stuff instead of discussing on here and then I'm like 'forget that, this is more fun'.

I know right :redface:

how did you find f325?

you know in the Jan 2013 paper, the electrophilic sub, I did the NO2 in the carbon 1 like and the CH3COOH in carbon 3, does it mean the same thing

Reply 2665

MedMed12

21

is this exam 1 hour or 1 hr 15 mins?

Reply 2666

_HabibaH_

8

Original post by Sinkim

Do i need to know how terylene, kevlar, poly lactic acid and nylon6,6 are made?

Nylon-6,6 and Kevlar are Polyamides - so condensation reaction
Poly(Lactic Acid) and Terylene are Polyesters - so, again, condensation reaction

Reply 2667

2013leaver

5

any tips for predicting the impurity formed? HArd question for me

Reply 2668

V__005

17

Original post by _HabibaH_

Lol same. I'm literally just sat here going through this thinking maybe I should be recalling stuff instead of discussing on here and then I'm like 'forget that, this is more fun'.

What do we need to know on polyesters and polyamides?

Reply 2669

_HabibaH_

8

Original post by otrivine

I know right :redface:

how did you find f325?

you know in the Jan 2013 paper, the electrophilic sub, I did the NO2 in the carbon 1 like and the CH3COOH in carbon 3, does it mean the same thing

Yep as long as there's a difference of one between both positions.

I found it slightly tricky on places and I don't think I did as well as I'd hoped to have done - silly errors etc.

Reply 2670

MathsNerd1

17

Original post by otrivine

No, I dont want diagram I need in words

Okay so basically you begin with a benzene ring that attracts an electrophile which forms an intermediate that breaks the delocalised benzene ring because of the bond with the electrophile, this then donates the pair of electrons to reform the benzene ring and there you go in very basic terms. Care to go into more detail for me?

Reply 2671

otrivine

OP

14

Original post by _HabibaH_

Yep as long as there's a difference of one between both positions.

I found it slightly tricky on places and I don't think I did as well as I'd hoped to have done - silly errors etc.

It was such a good paper for Jan 2013, I think ours is hard

Reply 2672

simifeltham

anyone want to revise with some questions? Or is everyone set :biggrin:

Reply 2673

D4rth

9

Original post by _HabibaH_

Maybe it was too below par for those genius', who knows. :colondollar:

We all went to sleep :P

J/K, what solubility question? I answered quite a few before.

Posted from TSR Mobile

Reply 2674

emah123

5

Any one else staying up late? I know I should sleep buy even though I've revised I can't get to sleep so might as well do some revision!

Reply 2675

otrivine

OP

14

Original post by MathsNerd1

Okay so basically you begin with a benzene ring that attracts an electrophile which forms an intermediate that breaks the delocalised benzene ring because of the bond with the electrophile, this then donates the pair of electrons to reform the benzene ring and there you go in very basic terms. Care to go into more detail for me?

what you said is sufficient for 3 marks :tongue:

and more likely they would ask you to draw it.

Reply 2676

RoryH

13

Original post by Varsh05

What do we need to know on polyesters and polyamides?

making them from their monomers and the hydrolysis of them :smile:

Reply 2677

_HabibaH_

8

Original post by Varsh05

What do we need to know on polyesters and polyamides?

How they are made - so their condensation reactions
The functional group formed for each type of condensation reaction
Maybe the main examples shown in the book - if its in the spec
Their implications - so carbon neutral, less litter, less harmful gases
Isomerism - optical in these ones
Difference between synthetic and natural - what does this result in?
The products formed from hydrolysis by acid/alkali
The conditions or each type of hydrolysis

THAT'S ALL I CAN THINK OF RIGHT NOW.