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

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Reply 180
Avatar for Bruhh
Bruhh
10
Original post by douglaswill
Are tangled chains not as easy to slide over each other as cystalline ones?


Yeah
Original post by Bruhh
Yeah


thanks!
Reply 182
Avatar for Bruhh
Bruhh
10
Original post by douglaswill
thanks!


Although crystalline polymers are still quite stiff due to their IM bonds making it harder for chains to slide over each other.
Original post by Marccs
Does anyone know the reaction that takes place at the hydrogen electrode ?


2H+ (aq)+ 2e- --> H2 (g)
Reply 184
Avatar for Kaz_96
Kaz_96
8
what did people get for part 3 of the bromine question?
Original post by Kaz_96
what did people get for part 3 of the bromine question?
7. First put it was 1 but then saw it was for 100g instead of 10g of the sample.
Original post by jack.lp.thompson
7. First put it was 1 but then saw it was for 100g instead of 10g of the sample.


I got 7 too, are you confident it's correct?
Original post by chloewilliamsss
I got 7 too, are you confident it's correct?


Got 7 too, so hope it's right
Reply 188
Avatar for Kwaks
Kwaks
9
For name the type of condensation polymer I put 'ester' rather than poly(ester) will I get it wrong????


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Original post by chloewilliamsss
I got 7 too, are you confident it's correct?
I think so. The other people at the top of my class got that too. You would only get one mark for the correct answer anyway. It will depend on the method also.
Original post by Aspire7736
Got 7 too, so hope it's right


My answer was a complete guess of calculations in the last 5 mins of the exam so I'd be utterly amazed if it was, but I trust you guys knew what you were doing
Original post by Kwaks
For name the type of condensation polymer I put 'ester' rather than poly(ester) will I get it wrong????


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I think you may be wrong unfortunately
Reply 192
Avatar for Kwaks
Kwaks
9
Original post by Aspire7736
I think you may be wrong unfortunately


Oh well I realised now that I'm on the bus


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Original post by chloewilliamsss
My answer was a complete guess of calculations in the last 5 mins of the exam so I'd be utterly amazed if it was, but I trust you guys knew what you were doing
I had to leave it till last. Never seen anything like that before!
Original post by jack.lp.thompson
I had to leave it till last. Never seen anything like that before!


Me either? There had been one about iodine numbers in a previous paper but I don't remember it being that difficult
Reply 195
Avatar for Kwaks
Kwaks
9
What did you put for the rate equation? Also what did you put for effect on results if the volatile substances are lost. I put it makes the rate appear faster than it actually is.....


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(edited 7 years ago)
Reply 196
Avatar for Kaz_96
Kaz_96
8
I got 195 for that part 3 LOL the bromine q entirely was v tricky
What answers did you put for the 5 marker about the red brown precipitate and rusting?
Original post by Kaz_96
what did people get for part 3 of the bromine question?


ImageUploadedByStudent Room1465914108.799780.jpg

I put this. Got full marks i think.


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Original post by Kaz_96
I got 195 for that part 3 LOL the bromine q entirely was v tricky


I got 195 for the 1st 2 marker of the bromine numbers questions

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