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OCR B Salters - F335 Exam - 15 June 2011

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Reply 660

JoshTait

Original post by MyJunkIsYou

Was it not SF4 to SF6? Did I misread the question?
I put 6SF4 + 02 --> 4SF6 + 2SO

Yeah it was SF4 to SF6. The question said blah blah "the reaction of sulphur tetrafluoride with oxygen to form sulphur hexafluoride"

I put

3SF4 + O2 ---> 2SF6 + SO2

I reckon they'll allow both? They both balance and make sense.

Reply 661

Paolat

does the equilibrium shift to the left when u add acid?

Reply 662

golddust&lipgloss

this paper ****ed me over so badly.
goodbye uni,

Reply 663

jungdao

Original post by JoshTait

3SF4 + O2 ---> 2SF6 + SO2 is correct I think. I doubt that SO would form.

http://www.patentstorm.us/patents/5639435/description.html

Reply 664

Paolat

Original post by ABCDemily

I had a quick count and managed to drop at least 25, just through pure lack of knowledge and the others not being as detailed as they should have been. Not good!

I have an English Lit exam tomorrow morning. I need to get off TSR.

but its so addictive (comming on tsr to see what people got in their answers) lol

Reply 665

jungdao

The dimethylamine salt with 2,4-D picture is on this site:

http://www.pesticideinfo.org/Detail_Chemical.jsp?Rec_Id=PC33374

Reply 666

tom108

Original post by jungdao

The dimethylamine salt with 2,4-D picture is on this site:

http://www.pesticideinfo.org/Detail_Chemical.jsp?Rec_Id=PC33374

Yeeeeeeeeeeeeeeeeeeeeey!!

Reply 667

tkoki1993

Original post by jungdao

The dimethylamine salt with 2,4-D picture is on this site:

http://www.pesticideinfo.org/Detail_Chemical.jsp?Rec_Id=PC33374

Omg I can't believe I got that right. That was a complete guess for me loool

Reply 668

Boo!xx

Original post by ABCDemily

haha same, i need to revise for english, but im too depressed over this exam :[

Reply 669

41jms

i hate reading through this im realising all my mistakes! arhh really hope grade boundaries are super duper low. :frown:

. What do people think it will be realistically?

also would did you put for the potassium chlorate Q ?

Reply 670

jungdao

Original post by 41jms

i hate reading through this im realising all my mistakes! arhh really hope grade boundaries are super duper low. :frown:

. What do people think it will be realistically?

also would did you put for the potassium chlorate Q ?

It said the oxidation state of chlorine was +7 so I thought chlorate would be ClO4- making KClO4 but google says KClO3 is potassium chlorate and KClO4 is potassium perchlorate so who knows :redface:

Edit: apparently KClO4 is also called Potassium chlorate(VII) which would make it work.

(edited 12 years ago)

Reply 671

JoshTait

KClO4 me thinks.

The question said chlorate(VII) in it i think.

Reply 672

username461215

hmm was an ok paper

deffo got 19.4g for the last 4 mark calc...which some of my mates got some didnt so who knows
errm what else

oh yea 90 degree for the sf6 bond angles

the salt i drew the same as the picture someone posted up earlier so all kosher there

and the final line on the last Q had to be below the initial line as it was exo

hope everyone's done well . good luck! x

Reply 673

tom108

anyone know what the answer was to when we had to draw a curly arrow to show the momevment of electrons for one mark?

And what was the answer to 'why is CH2CLCH3BR formed wheras CH2CLCH2CL not formed when solution is mixed in NAOH.???

Reply 674

Abi_18

I feel so disheartened.

Reply 675

hahahah

anyone got the answers for this exam yet???

Reply 676

Assrarri

Original post by cleverbong

I think it is 19g.

19...what how...i got 74

DAMMNNN ...

Reply 677

Paolat

Has anyone got the answers or the paper

Reply 678

ManPowa

Original post by jungdao

The dimethylamine salt with 2,4-D picture is on this site:

http://www.pesticideinfo.org/Detail_Chemical.jsp?Rec_Id=PC33374

Original post by tom108

Yeeeeeeeeeeeeeeeeeeeeey!!

For that question instead of drawing out the whole molecule i thought id draw just the COO-( so basically, just the carboxylate anion and of course the the other molecule i got right with was protonated nitrogen..

Helppp :/

Reply 679

Sarmila

I thought it was alright compared to the biology paper!

did people write electrophilic substitution for the first question about the type of reaction?

Has anyone found an unofficial mark scheme yet?