Salters Chemistry F335- June Exam

Just came across something on the spec I have NO idea about

Its the uses of ionic liquids. Can someone please explain it to me please. Its come up in an exam before but you just had to define what an ionic liquid is.

thanks

According to Wikipedia;

'An ionic liquid is a salt in the liquid state'.

Which past paper was it in?

Ionic liquids are used to carry out Friedel-Crafts acylation reactions - they are liquids at room temperature even though they contain ions. They are green alternatives to ordinary solvents because:

.Their low volatility reduces emissions
.Their low volatility and low toxicity increases safety
.Friedel-Crafts reactions can be carried out at lower temperatures so energy costs are lower
.The ionic liquid can easily be recycled, saving resources and money

any tips of what you guys think is coming up? anyone know what came up in January?

Our teacher has said repeatedly that GLC is going to make an appearance, given it's absence from the Jun 2010 and Jan 2011 papers...

can anyone help me out, been reading books but cant see a good explanation of N.M.R i understand the jist of it but what does it mean when a spectrum has more than one peak, does it have anything to do with n+1 rule, if anyone could help me out with N.M.R would be much appreciated

Search NMR Chemguide on google

thanks for our syllabus do we only consider high resolution NMR or do we need to know about both high and low?

can anyone help me out, been reading books but cant see a good explanation of N.M.R i understand the jist of it but what does it mean when a spectrum has more than one peak, does it have anything to do with n+1 rule, if anyone could help me out with N.M.R would be much appreciated

DifferENt peaks in the spectrum represent different environments for the H+/protons; low and high-resolution n.m.r.;
For example, CH3CH2OH, or ethanol, would have 3 peaks because there are 3 different environments for the protons.
CH3,
CH2,
OH

The 'n+1' rule only applies if the question asks for reference to the splitting pattern or shows a high-resolution spectrum.
It refers to the number of adjacent protons. Adjacent protons generate their own localised magnetic field and therefore alter the resonance of the measured protons.
'n+1' refers to the following pattern, when the measured proton is adjacent to:
-RC(R)R - No protons - singlet(1)
-RC(H)R - 1 proton - doublet (2)
-HC(H)R - 2 protons - triplet (3)
-HC(H)H - 3 protons - quartet (4)

The splitting pattern of a high-resolution n.m.r peak is +1 of the number of adjacent protons (n). Therefore 'n+1'.

Was it just me or did you get a messed up answer for the NMR question, the values on table gave me some messed up compounds, overall paper was okay, not as hard any january, what did you lot think of it.

I don't think that the NMR question wanted a the ppm chemical shifts of the compounds; it asked for the compound identification based on the peaks, their areas and the splitting patterns (something aimed at targetting the higher grade candidates ).

Overall, I thought the paper was alright; lots on synoptic stuff (electronegativity, dipoles and bond polarities...), but there was stuff on reaction mechanisms which was alright. I didn't like the 4-mark maths question at the end though...

lol what you trying to say... troolololol Saaaammme I was running outta time aswell so I put down loosely related chemistry equations in hope i would get method marks. Just to check for one of the questions did you write covalent, metallic and ionic bonding cause I wasted like 10 mins thinking over what the kinda bonding was lol. Helped alot that I resat F332 aswell =p Oh and thanks for the help on NMR it helped a lil lol...