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Ok a quick lesson on proportionality: If we say something, lets call it 'y', is proportional to something else, 'x', then we mean the following: y = kx (k is a constant, meaning it doesn't change). Now if we say something is inverseley proportional to something else we have: y=k/x...

HSC physics is not physics. It's more like the study of the social impact of physics. Same with any of the HSC sciences, I reckon heaps of B Arts people hold the jobs at BOS, imposing their history lessons on us. I mean not that theres anything wrong with history, it's just I would have done...

Of course it is valid to do that. I'm just suprised noone even mentioned a*b = c/a which was strange...

x+1/x = 5 x^2 - 5x + 1 alpha + beta = 5/1 alpha*beta = 1 :. beta = 1/alpha thus alpha + 1/alpha = alpha + beta = 5 (alpha^2 + beta^2) = (alpha + beta)^2 - 2(alpha*beta) = 5^2 - 2 = 23

Sure, have a look at this thread: http://www.boredofstudies.org/community/showthread.php?t=34578 I don't know how reliable that is though... 63 for a band 5 sounds like a bit of BS to me...

What do you reckon you got, I'm talking raw marks here: I reckon I got around mid 80's.... Shipwrecks was a little weird :|

You could also do cobalt 60 for medicine and industry In medicine it is used for cancer treatment, in industry its used for thickness detection.

1 For medicine 1 for industry I'm doing Tc-99m (the m is important, without it, normal Tc-99 has a very long half life, it means something like meta-stable state or something). And sodium-24 which is chemically bonded to Chloride and this salt is dissolved in water and used in pipes to...

You should note that it is not sufficient to just say what the refluxing apparatus does. You have to talk about the reason for refluxing, which is outlined above...

I reckon for the 6-7 marker they will do 2 salvage projects.

Cation Tests: Add HCl ---> PPT = Pb(2+) Add H2SO4 ---> PPT = Ca(2+) or Ba(2+) THEN: Add F(-) ---> PPT = Ca(2+), No PPT = Ba(2+) Add NaOH ---> Blue PPT = Cu(2+) Brown PPT = Fe(3+) White to Brown PPT = Fe(2+) Anion Tests Add HNO3, bubbles = CO3(2-) Acidify sample, add...

OK basically I've come up with some rules. It is impossible to reduce aqueous solutions of things with potentials <-1V It is really hard to oxidise things as the number increases (fluoride is hard to oxidise), however you can oxidise things like Cl if it has a high enough concentration...

Uh Ionisation of esters? Esters dont ionise. And a nutritionist is someone who studies nutrition, as far as I know.

Cheers so if they ask us to list how to measure water quality we can do the following: Turbidity: Tube with the X on it TDS: Conduction Hardness: Ca/Mg ions, titrate against EDTA. DO: Oxygen Sensor electrode/ Titration BOD: Measure Oxygen, add nutrients, place away for 5 days, re measure/...

The best way to quantitatively do this is as follows right: Add ammoium molybdate, then ascorpic acid (vit c) turning it a deep blue colour. Use a spectrophotometer to measure the absorpance and compare this with a standard solution's absorpance that has been treated in the same way. You can...

Hehe yeah cheers :) I've already crammed so much crap into my head in the last few days cant hurt to jam in some more stuff lol...

"Na, but you would want to know the reduction and oxidation equations" crap... more stuff to learn quickly....

Yeah just do analytical chemistry. A chemical principle used is absorption for gas-solid chromatography... This is used in the industry for monitoring the quality of ethylene produced like at the Qenos plant. according to Conqering chem anyways.

ALSO: Is it sufficient to use the shorthand for a description of the cells? IE: Dry Cell: Zn| (ZnCl2), NH4Cl | MnO2, C Silver Oxide: Zn, ZnO | KOH (paste) | Ag2O, Ag ???? Or do we have to be able to draw crappy diagrams?

Are there any??? Only thing i cant find info on? how are they safely disposed?