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OCR B F335 - Chemistry by Design - 13th June 2012

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Reply 360

Jasmine_777

how much detail do we need to know about the Haber process and the N2 cycle ??

Reply 361

kishenp

Original post by Hazel247

If you count the longest chain of carbons first then you know what the end part will be, and you can then add on the functional groups in alphabetical order. And remember you always number the functional groups as low as you possibly can (so think about which end you start counting from!)

Hope this helps :smile:

Thank you very much
would you be able to give me an example please :smile:

Reply 362

Princess Kawaii

Explain why synthons are not often used to make the required compound?

Reply 363

master_blaster66

Original post by Princess Kawaii

Explain why synthons are not often used to make the required compound?

thats because they are very unstable and they cannot be obtained :smile:

Reply 364

master_blaster66

Original post by Jasmine_777

how much detail do we need to know about the Haber process and the N2 cycle ??

erm you should know the equation off by hear which is quiet easy to remember and just remember the conditions :smile:

..you should be alright with haber process if you know that i think :rolleyes:

Reply 365

Mathlete 4 the win

Original post by Princess Kawaii

Explain why synthons are not often used to make the required compound?

Because the majority of the time the synthons don't exist, they're not real compounds.

Reply 366

Jasmine_777

Original post by Princess Kawaii

Explain why synthons are not often used to make the required compound?

they're also just hypothetical

Reply 367

Jasmine_777

Original post by master_blaster66

erm you should know the equation off by hear which is quiet easy to remember and just remember the conditions :smile:

..you should be alright with haber process if you know that i think :rolleyes:

all I know is N2 + 3H2 <===> 2NH3
All gaseous.

What are the conditions?

Also, how much do you know about the N2 cycle? :smile:

Reply 368

master_blaster66

200atm and 450 degrees and iron catalyst used

well ive just memorised the nitrogen cycle, but you should know about fertilizers, pesticides etc. and tyou should know what they do :smile:

hope that helped

Reply 369

Jasmine_777

do we need to know solubility product, Ksp ?

Reply 370

master_blaster66

Original post by Jasmine_777

do we need to know solubility product, Ksp ?

Reply 371

Anthony Soprano

Original post by Ilyas

messed up jan 2012 paper... only got 84/120 raw. Damn enzymes!

That's still an A isn't it??

Reply 372

Venomilys

Original post by Anthony Soprano

That's still an A isn't it??

Yep, but I want a high A* in this so I can slack off in chemistry of materials (next one), I'm better at chem by design, been getting consistent A*'s in all other papers...

(edited 11 years ago)

Reply 373

Anthony Soprano

Original post by Ilyas

Yep, but I want a high A* in this so I can slack off in chemistry of materials (next one), I'm better at chem by design, been getting consistent A*'s in all other papers...

Ahh i see now :cool:

Best of luck this time round, and if worst come to worst, you still have an A :rolleyes:

Reply 374

master_blaster66

Original post by Ilyas

Yep, but I want a high A* in this so I can slack off in chemistry of materials (next one), I'm better at chem by design, been getting consistent A*'s in all other papers...

what did you get in f334 in jan?

Reply 375

Princess Kawaii

when you work out the oxidation number of soemthing do u take into account the big numbers infron of the compound? Or do u ignore them?

e.g. 2CuF2 is F = -2 or -4?

thnx :smile:

Reply 376

Beffnaay

Can anyone enlighten me on the nitrogen redox things? I thought I could do them but I found out that I really can't :frown:

Reply 377

Princess Kawaii

How can a solution of Ammonium Acetate act as a buffer?

Reply 378

master_blaster66

Original post by Princess Kawaii

when you work out the oxidation number of soemthing do u take into account the big numbers infron of the compound? Or do u ignore them?

e.g. 2CuF2 is F = -2 or -4?

thnx :smile:

F would be -2..you ignore the no. of moles