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So great that you transferred! :o I don't know what is with nanotech - why not look at the bigger picture. That's why I am at materials science and chem. Nah, I have nothing against nano, they are always good for a few at the roundhouse! :uhhuh:

I encourage people to go off syllabus from time to time because not only do you get a deeper understanding of the topic, but it makes other elements come more intuitively. :D

Yeah well like my year 7 teacher was always saying, students retain 80% of what they teach, and I'm finally believing and testing out that statistic (because damn I need it). :o

NO WORRIES :cool:

I am guessing this is almost, but not quite, entirely unrelated to HSC chemistry, but I'll help where pos. Initally; solvent>solutes CHCl3> I2 H2O> I- Shakey shake shake CHCl3> I2 H2O> I- , I3 - I am guessing you used a starch indicator for the titration which weakly bonds...

Not knowing a whole heap about the prac I guess it works like this; I2 + starch <--> blue complex Kf = low Solution is blue. Titrate with thiosulfate. I2 + 2 S2O3 2- --> 2I - + S4O6 2- Kf = high When near end point think Le Chatelier's principal. blue...

mass is quantity. grams is unit of mass. I have a professor who would go ballistic if anyone made that mistake! :p

How about; discrepancies in concentration ( error of glassware, standard potentials are for 1M 25C, 10^5 Pa) temperature (obvious since delta E is proportional to temperature) pressure (if gas involved in equilibria) pH effects (unlikely, but possible in more complicated...

For anyone who cares: ppm (parts per million) is a unit of molality (not molarity). It is used extensively in environmental studies. ie copper content in water etc. Also, consumer goods normally quote molality of active ingredients.ie toothpaste active ingredients: NaF 0.22 w/w%. It's used...

Following on from my last post.. pH probe errors: agitation temperature matrix effects ionic strength response time conditioning rinsing read for further explaination Also I read that a recent discovery traced that pH probes measure Na+ transport rather than H+. I don't know...

Pedants and purists are turning in their graves!

pH meters => improper calibration, instrument drift, lack of temperature compensation, improper sampling, or a dirty probe. Some indicators have thermochromic properties, though not terribly significant errors here. Remember that most indicators are weak buffers under equilibrium between...

Van Der Waals forces are all the intermolecular forces; Hydrogen bonding Dispersion forces Dipole-dipole Induced dipole etc. Only Hydrogen bonding and dispersion forces are strong enough to worry about at the moment. Dispersion forces dominate material properties with increasing...

And then crusty petrol stations use it as a fuel extender!

I am half way to being a Materials Chemist! Also surfactant, food, inorganic and physical chemists. Hope that helps and good luck.

Ahhhaahhh!!! What are the odds? I see the latin goes well! See ya tomorrow champ (today). :p

'Aim: The aim of this experiment is to determine the pH of an unknown solution by basic volumetric analysis. The unknown was titrated with a prepared standard in order to calculate the hydronium ion concentration.' Supplement 'pH' in the first sentance if you are meant to find the...

And oxidation states of iron; Fe(-II) - [Fe(CO)4]2- Fe(0) - [Fe(CO)5] Fe(II) - [Fe(H2O)6]2+ , [Fe(en)3]2+ Fe(III) - [Fe(edta)(H20)]- Fe(IV) - [Fe(As~As)2Cl2]2+ Fe(VI) - [FeO4]2- :rolleyes:

Yeah thurderdax is spot on (quoting SI chem data book); Lithium: Metallic Li Radius = 152pm 1+ Ionic Radius* = 76pm Fluorine/fluoride: Covalent F Radius = 71pm 1- Ionic Radius* = 133pm * for Coordination Numbers of 6 ie. LiF

I'd love to help but I'll be running a stall all day... Look out for the UNSW Jitsu Club stall!