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# A2 OCR Chemistry B F334 - June 2015 Watch

1. (Original post by BrokenS0ulz)
OCR use the amino-X way of naming for amines, I'd stick to that.
Okay thanks
Also,
Jan 11 3b
C3H7NH2
Answer: propylamine/1-aminopropane do not allow: aminopropane
I'm not sure why aminopropane would be wrong?
2. (Original post by Welbeck)
June 12 4g- I don't get how you do the first step. The mark scheme says:
If 0.6625g of Na2CO3 is made into a 1dm^3 solution (and Mr is 106) then why is the conc (0.6625/106)moldm^3

Anyone explain/?
I went ahead by doing n=m/mr 0.6225/106
To work out the number of moles of Na2CO3
Because they gave you the mass of NA2CO3 and you have mr you use the other formula
I went ahead by doing n=m/mr 0.6225/106
To work out the number of moles of Na2CO3
Because they gave you the mass of NA2CO3 and you have mr you use the other formula
Ohh, I get it now, just sounded a bit confusing. Thanks
4. (Original post by tealover96)
Okay thanks
Also,
Jan 11 3b
C3H7NH2
Answer: propylamine/1-aminopropane do not allow: aminopropane
I'm not sure why aminopropane would be wrong?
The amine is on the first carbon so you had to specify the 1-aminopropane. or go ahead by doing by using the direct name propylamine
5. (Original post by tealover96)
Okay thanks
Also,
Jan 11 3b
C3H7NH2
Answer: propylamine/1-aminopropane do not allow: aminopropane
I'm not sure why aminopropane would be wrong?
I think it's because it could be 1-aminopropane or2-aminopropane, so you need to specify which one it is
6. (Original post by Welbeck)
Ohh, I get it now, just sounded a bit confusing. Thanks
no problem
Life saver just saved me having to write it up my self XD. Thanks a lot man.
How can I see them I can't find the original post!
The amine is on the first carbon so you had to specify the 1-aminopropane. or go ahead by doing by using the direct name propylamine
(Original post by BrokenS0ulz)
I think it's because it could be 1-aminopropane or2-aminopropane, so you need to specify which one it is

Thanks!
I assumed that 1s didn't have to be written for some reason
9. (Original post by KittenMittens)
How can I see them I can't find the original post!
it was on the last page its not my notes btw credits to the person
Attached Files
10. Chem A2 -edited.docx (26.8 KB, 100 views)
11. we dont need to know how to name complexes..
12. (Original post by nats927)
we dont need to know how to name complexes..
Yes you do need to know how to name them it is in the spec and revise book
i wish i never had 3 exams in a row, need more time ffs
Yes you do need to know how to name them it is in the spec and revise book
my teacher said we didnt, but i looked.. oh crap. reckon i can learn it all by tomorrow?
it was on the last page its not my notes btw credits to the person
Thanks!
16. (Original post by Anonymous696061)
LOL, same here -just looked around 5mins into the exam to see wtf looks on everyone's face.....;P

Anyways, I'm sorry to you & everyone else using my notes, cos there was a minor error about E cells that I made; here's the revised version! (-Couldn't edit original attachment for some reason so deleted that post:P)
I was just about to post that cos the metal with the more electronegative electrode potential is a reducing agent
17. Guys I have a question. How do you know if a molecule with an oxygen in its structure will form hydrogen bonds or permanent dipole - permanent dipole? Or both? Thanks
18. (Original post by nats927)
my teacher said we didnt, but i looked.. oh crap. reckon i can learn it all by tomorrow?
it will take 10 mins to learn its really easy just know the simple rules on revise book page 32-33.
19. (Original post by KittenMittens)
Guys I have a question. How do you know if a molecule with an oxygen in its structure will form hydrogen bonds or permanent dipole - permanent dipole? Or both? Thanks
The three molecules that can form hydrogen bonds are FON or fone .
Flourine , Oxygen and Nitrogen, if these are present just focus on hydrogen bonding if it other electronegative molecules like Cl or Br etc then it is permanent due to the large difference in electronegativity value.
20. (Original post by KittenMittens)
Guys I have a question. How do you know if a molecule with an oxygen in its structure will form hydrogen bonds or permanent dipole - permanent dipole? Or both? Thanks
pd-pd when theres a polar bond ie c-cl cl is more electronegative so pulls electrons towards it becoming the delta negative
but if theres H connected to either O,F,N bond then its hydrogen ie O-H
it will take 10 mins to learn its really easy just know the simple rules on revise book page 32-33.
thank you for letting me know i was literally going to skip past it.
do you reckon if i just revise from salters book i can get a good grade?

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