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

http://www.thestudentroom.co.uk/showthread.php?t=2030440

never made one before, if its rubbish someone else please make one

Reply 781

hash007

15

Original post by swimming002

what did everyone say about very last question and solubility?

Entropy decreases is what I explained, but I stated the entropy increased :facepalm:

Reply 782

chunderseverywhere

5

Original post by hash007

I got 73 % for that

I got 73% as well!

Reply 783

sydney07

Original post by Beffnaay

I got like ZnCl.h3O+, I had NO idea haha

Yeh I got ZnClO H3O+ or something

Reply 784

Toshiya

1

I thought that was horrendous. I needed a C on that paper. I don't think I got it.
Most people in my school found it equally as horrible, apart from one or two... :frown:

Reply 785

Birterillo

5

Original post by sunshinesmile10

no, because all the benzenes come from the benzene part.... i put trichloromethane. but i put the formula not the name

Could you explain which question this is? Panicking I don't recognise it at all...

Reply 786

blingmonkeys

Why is NO2 advantageous?

Reply 787

I failed badly

I think i got 73% or something for the theoretical, i am going to look at the paper when my teacher gets it so i can work it out again. Did anyone else get a ring structure for the acid anhydride? The first page had a few bits that stumped me but i think i have managed to fluke the concentration of nitrogen.

Reply 788

hash007

15

What did people draw as the compound Y, where it was reacting with CN. Nucleophillic sub, kinda confused me, why do large ions have lower melting point? Advantages/disadvantages of NO2, then Nitric + Sulphuric acid question was hard too!

Reply 789

katiecornish

1

what did everyone get for the question that said two of a particular molecule react forming compound X? So it made an ester... but i swear the formula had 1 too little hydrogens in it? :frown:

Reply 790

katiecornish

1

Original post by hash007

What did people draw as the compound Y, where it was reacting with CN. Nucleophillic sub, kinda confused me, why do large ions have lower melting point? Advantages/disadvantages of NO2, then Nitric + Sulphuric acid question was hard too!

the same molecule as the 3rd one but replaced the COOH group with a CN?

Reply 791

Claudine

14

Well there's always prostitution... :wink:

Reply 792

Beffnaay

I got 75%, because you had to work out the moles for each and then divided the actual by the theoretical? I thought :frown:

Reply 793

blingmonkeys

Original post by hash007

What did people draw as the compound Y, where it was reacting with CN. Nucleophillic sub, kinda confused me, why do large ions have lower melting point? Advantages/disadvantages of NO2, then Nitric + Sulphuric acid question was hard too!

It was nucleophillic addition I think H3CCOHCNH or something?

Reply 794

Iepnauy

9

Original post by hash007

What did people draw as the compound Y, where it was reacting with CN. Nucleophillic sub, kinda confused me, why do large ions have lower melting point? Advantages/disadvantages of NO2, then Nitric + Sulphuric acid question was hard too!

Compound Y. Erm... CH2OHCN?

Large ions have a larger radius, takes up more space so not as compact, generally weaker intermolecular bonds.

Reply 795

*_*

Original post by katiecornish

what did everyone get for the question that said two of a particular molecule react forming compound X? So it made an ester... but i swear the formula had 1 too little hydrogens in it? :frown:

Oh yeah, god knows what the answer for that was. I got an ester but yeah the formula threw me.

Reply 796

Waki

that was beyond a joke!

Reply 797

Claudine

14

I got 73%
it was something like 9/12.1 ... x 100

Reply 798

Toshiya

1

Original post by katiecornish

what did everyone get for the question that said two of a particular molecule react forming compound X? So it made an ester... but i swear the formula had 1 too little hydrogens in it? :frown: