[gmseahorse]

Okay does anybody want to do a little sort of revision quiz thing?
One person asks a question and the first to answer correctly gets to ask the next one.

First question: give two uses for carbon nanotubes.

[cardigansandjeans]

(Original post by gmseahorse)
Okay does anybody want to do a little sort of revision quiz thing?
One person asks a question and the first to answer correctly gets to ask the next one.

First question: give two uses for carbon nanotubes.

Yeah
industrial catalysts and semi-conductors in electrical circuits

What are the three equations for the contact process?

[gmseahorse]

S + O2-> so2
2SO2+O2->2SO3
SO3+H2O->H2SO4

What is the catalyst for the hydration of ethene?

[meme0609]

Does anyone know any good links to websites with past papers?

[Simran Mars Foster]

Hot phosphoric acid catalyst! (i think)
What effect does the following have on yield and equilbrium

Temperature(450)
Atmosphoric pessure
Catalys

This type of question i have at least twice in past papers!


P.S Any advise on molar question? I stuggle with those and you need to master them..

[cuckoo99]

(Original post by Simran Mars Foster)
Hot phosphoric acid catalyst! (i think)
What effect does the following have on yield and equilbrium

Temperature(450)
Atmosphoric pessure
Catalys

This type of question i have at least twice in past papers!


P.S Any advise on molar question? I stuggle with those and you need to master them..

lol they ask those sorts of things at gcse now :O? we learnt that in AS. i guess they dont ask why temperature and atmosphere effect the yield. Sorry for highjacking the thread was just curious ;p

[Simran Mars Foster]

(Original post by cuckoo99)
lol they ask those sorts of things at gcse now :O? we learnt that in AS. i guess they dont ask why temperature and atmosphere effect the yield. Sorry for highjacking the thread was just curious ;p

Hahah really! Wow.Stupid ocr.>:/

[Simran Mars Foster]

(Original post by No brainer1)
Same here

me 4!

[robynelisabeth]

actually dreading this exam! D:

[cuckoo99]

(Original post by Simran Mars Foster)
Hahah really! Wow.Stupid ocr.>:/

haha do you guys need to know that the direction the equilibrium shifts is dependent on whether or not the forward reaction is endothermic or exothermic?

[Simran Mars Foster]

(Original post by cuckoo99)
haha do you guys need to know that the direction the equilibrium shifts is dependent on whether or not the forward reaction is endothermic or exothermic?

Oh no we don't actually! (phew!) Though im going to one day as i want to it for A level

[cuckoo99]

(Original post by Simran Mars Foster)
Oh no we don't actually! (phew!) Though im going to one day as i want to it for A level

ah equilibria is pretty straightforward at AS GL with this exam, i did it last year and got 50/50 ums ;p

[gmseahorse]

(Original post by cuckoo99)
lol they ask those sorts of things at gcse now :O? we learnt that in AS. i guess they dont ask why temperature and atmosphere effect the yield. Sorry for highjacking the thread was just curious ;p

There is a bit in the syllabus on why they affect things, some limited stuff about more collisions or something, I would love to know in a bit more depth though.

[k-pop]

http://www.ocr.org.uk/qualifications...y_b/documents/ just click on the mark scheme to match the paper

[meme0609]

Would anyone mind telling me what they think the answer to question 9a on here is please? http://pdf.ocr.org.uk/download/asses..._b74202_h.pdf?

[k-pop]

107g/mol

[meme0609]

(Original post by k-pop)
107g/mol

thanks I couldn't find the mark scheme

[k-pop]

its OK. I need help with equilibrium/equilibria the book doesn't explain it properly and i looked at mark schemes its still not making any sense. I need exactly 49/60 in this exam to get an A altogether in chemistry (I messed around a lot in year 10)

[meme0609]

(Original post by k-pop)
its OK. I need help with equilibrium/equilibria the book doesn't explain it properly and i looked at mark schemes its still not making any sense. I need exactly 49/60 in this exam to get an A altogether in chemistry (I messed around a lot in year 10)

So what bit don't you get?

[k-pop]

Everything. Lol. Like the position of it when a factor changes. I think I have direction dyslexicia I have to stare at my shoes for a while to check their the right way ( it's that bad). Before I digress to much equalibria yeah