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OCR Chemistry B (Salters) F334/F335 Exam Thread 2016 (14th/22nd June)

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For the mass spec one, I said they would have different molecular ions and the second one would have a fragment due to ch3+ with an m/z value of 15 and the top one wouldn't ?

Reply 421

Akalanka25

Original post by charliexox

I made it nh3+ too

Do you know whether it was meant to be a zwitterion for this question? Or should we have not ionised any of the groups?

Reply 422

KINGYusuf

Original post by Lozzie97

I did that and then said how the transition metals form weak bonds with the reactants using the 4s and 3d electrons. But that part will probably only be worth one mark, if it is right.

I said that aswell :smile:

Reply 423

Tralph123

Original post by Akalanka25

Do you know whether it was meant to be a zwitterion for this question? Or should we have not ionised any of the groups?

yeah use zwitterion form

Reply 424

KINGYusuf

Original post by FemaleBo55

Yes I wrote that too!! I checked it was right.

Posted from TSR Mobile

If I wrote "Is it better than anything currently available?" does that count as a mark? lol

Reply 425

KINGYusuf

Original post by Kira Yagami

So everyone, for the medicine one I said

" Is it safe?"

"Is it better than current medicines being used/standard medicines being used now"

Damn I wrote:

"Is it effective/Does it work?"

"Is it better than anything currently available?"

Reply 426

IBerrr

Original post by onsmirnov

I think there were three isomers since there were two alkene bonds:
E and E
Z and Z
E and Z
but not Z and E since its symmetrical about the centre to Z and E = E and Z

Here is what the EZ isomer were supposed to be. If you drew all 4 you will get 4/4 marks as neither are wrong. Think of it like writing the same answer twice exactly the same both times, you will not lose a mark. Now can be put this one to rest now

image.jpg499.9KB

Reply 427

RyanOsman

For the excess question I calculated the volume that actually reacted and got 66.8cm^3

Could i get the marks for this?

Reply 428

Daniel9998

think I got about 63-66 marks so I pray to god thats a solid A

Reply 429

username1084917

For the E/z one I drew it correct but didn't make it look like that exactly , would i get the marks?

Reply 430

LewisEdwards1234

This was such a mixed paper for me, very hard to judge how well it went!

Reply 431

username1084917

For the hydrolysis one, I had three products and had nh2 with them all and a carboxylate ion, is that correct? how many marks would i get?

Reply 432

IBerrr

Original post by Kira Yagami

For the E/z one I drew it correct but didn't make it look like that exactly , would i get the marks?

I assumed oi drew the second c=c at the top right rather than bottom right. Either way as long as it is the same then yeh

Reply 433

LewisEdwards1234

Original post by Kira Yagami

For the hydrolysis one, I had three products and had nh2 with them all and a carboxylate ion, is that correct? how many marks would i get?

I believe there was two products as it asked to partially hydrolyze a specific bond, cannot remember what I put in terms of zwitterion charges

Reply 434

Jane-98

how many marks was that question the one where you had to name the functional groups on the last question

(edited 7 years ago)

Reply 435

username1084917

for the peaks

It was like phenol, arene, c-h , and ketone right? so the product was the bottom one?

Reply 436

username1084917

for cold drawing I said " It stretches the polymer, making chains straighter and more crystalline so chains are closer together, increasing strength of IMF etc...

I didn't talk about it forming a 'neck' would i lose a mark?