OCR AS Salters Chemistry F332 - Wednesday 23rd May 2012 1:30pm

Do you think the exam board will accept 'homolytic' without stating 'homolytic fission' because it just asked for the bond breaking which was homolytic. And the question about increasing pressure (the first one, it wasn't related to equilibrium right???) because I wrote that the particles have more energy per unit of time that have at least the activation energy because it said the condition was an increase in pressure???

Reply 1301

gstarwill

for the effects on equilibruim, i put both pressure and the temperature increases the yeild of the products.. shifts to the right. I saw someone say that the pressure one was shift to the left.. i said right, but still mentioned the shift towards the sside with less particles. what did everyone else get?

Reply 1302

gstarwill

and anyone who thought it was c15h21o

http://webbook.nist.gov/cgi/inchi/InChI%3D1S/C15H22O/c1-9(2)12-6-5-10(3)15-13(8-12)11(4)7-14(15)16/h10-12H,1,5-8H2,2-4H3/t10-,11-,12%2B/m1/s1

Reply 1303

swimming002

Original post by sharon800

wasnt question 2 something like
what type of bonding occurs with compound a? explain whether its a primary secondary or tertiary alcohol?

what type of bonding did you put?

i kind of remember the question!? i think i put hydrogen bonding

Reply 1304

MD2807

Original post by gstarwill

for the effects on equilibruim, i put both pressure and the temperature increases the yeild of the products.. shifts to the right. I saw someone say that the pressure one was shift to the left.. i said right, but still mentioned the shift towards the sside with less particles. what did everyone else get?

the increase in pressure meant it moved to the side with fewer gas particles, which was the left. the yield was decreased because more of the reactant was made not the product.

Reply 1305

gstarwill

Original post by MD2807

the increase in pressure meant it moved to the side with fewer gas particles, which was the left. the yield was decreased because more of the reactant was made not the product.

yea i know it shifts towards the side with less particles, i mentioned this. Maybe one mark.. probably not, I'd probably have got to got the other part right to get it. I think i just read the equation wrong. Although i hate waiting for my grade, I dont like looking through forums in search of a markscheme, i always find i make STUPID errors :facepalm:

ha!

Reply 1306

MD2807

Original post by gstarwill

yea i know it shifts towards the side with less particles, i mentioned this. Maybe one mark.. probably not, I'd probably have got to got the other part right to get it. I think i just read the equation wrong. Although i hate waiting for my grade, I dont like looking through forums in search of a markscheme, i always find i make STUPID errors :facepalm:

ha!

I know! I told myself i wasnt gona come on here after the exam because i was fairly confident about it but i couldnt help myself! havent seen anything too bad though.. still think f331 was soo much worse.

Reply 1307

ells-13

http://www.ocr.org.uk/download/pp_10_jan/ocr_49830_pp_10_jan_gce_332.pdf

http://www.ocr.org.uk/download/ms_10/ocr_50007_ms_10_gce_jan.pdf

Question 4)B - is that the same reagents and conditions for yesterdays paper???

I put sulfuric acid, potassium dichromate (shouldn't have) and heat under reflux - would I still get two marks or would dichromate contradict acid mark???

(Concentrated) sulfuric acid with dichromate and heat
scores zero. Ooops.

(edited 11 years ago)

Reply 1308

gstarwill

Original post by MD2807

I know! I told myself i wasnt gona come on here after the exam because i was fairly confident about it but i couldnt help myself! havent seen anything too bad though.. still think f331 was soo much worse.

Ha! really? i thought F331 was Ok. It was better than January.. (i got a B and retook) but i dont think i did as much work for it, so probably didnt get an A. Literally 75% of the people in my year retook F331 and everyone found it nicer than january. I thought it was alright, but i think i cocked up on a few questions.

Reply 1309

gstarwill

Original post by ells-13

http://www.ocr.org.uk/download/pp_10_jan/ocr_49830_pp_10_jan_gce_332.pdf

http://www.ocr.org.uk/download/ms_10/ocr_50007_ms_10_gce_jan.pdf

Question 4)B - is that the same reagents and conditions for yesterdays paper???

I put sulfuric acid, potassium dichromate (shouldn't have) and heat under reflux - would I still get two marks or would dichromate contradict acid mark???

(Concentrated) sulfuric acid with dichromate and heat
scores zero. Ooops.

I'm annoyed wwith the revision guide. It says "phosphoric acid/silica at 300degrees/60atm, OR with conc. H2SO4 and then H2O at 1atm"

I said H2SO4 and h2o at 1atm.. which is still right according to the book, but wrong according to the markscheme..

Reply 1310

ells-13

Original post by gstarwill

I'm annoyed wwith the revision guide. It says "phosphoric acid/silica at 300degrees/60atm, OR with conc. H2SO4 and then H2O at 1atm"

I said H2SO4 and h2o at 1atm.. which is still right according to the book, but wrong according to the markscheme..

That would be right. They have such varied responses. Just because I added a wrong reagent means I loose two marks. Hopefully the dichromate statement will not say scores zero in this paper. :biggrin:

Reply 1311

gstarwill

Original post by ells-13

That would be right. They have such varied responses. Just because I added a wrong reagent means I loose two marks. Hopefully the dichromate statement will not say scores zero in this paper. :biggrin:

fingers crossed. Ah yea that'd be annoying!. It's so nice only having one more exam! I had 8 in 10 days.. i really cannot bare waiting until August to get our results! plus its only 3 days before we all go on holiday.. so it could either be a really depressing trip or a celebration! ha

Reply 1312

swimming002

Original post by ells-13

http://www.ocr.org.uk/download/pp_10_jan/ocr_49830_pp_10_jan_gce_332.pdf

http://www.ocr.org.uk/download/ms_10/ocr_50007_ms_10_gce_jan.pdf

Question 4)B - is that the same reagents and conditions for yesterdays paper???

I put sulfuric acid, potassium dichromate (shouldn't have) and heat under reflux - would I still get two marks or would dichromate contradict acid mark???

(Concentrated) sulfuric acid with dichromate and heat
scores zero. Ooops.

is question 4b not an elimination reaction? I'm sure yesterday it was the addition of water as a nucleophile and so the reagents were phosphoric acid with high temperature and pressure?

Reply 1313

james.odedra

Original post by ells-13

That would be right. They have such varied responses. Just because I added a wrong reagent means I loose two marks. Hopefully the dichromate statement will not say scores zero in this paper. :biggrin:

It completely depends on what sort of process the question is asking for, e.g. industrial or lab experiement then you can choose from the two options from the CGP book.