Search results

year 12 chem is actually easier than yr11 chem, tribute to the pathetic system...

a tip? don't bother filtering. just wait till all the fairy dust settles, and pipette the liquid out. we had no problems last time...

for organic molecules, a quick rule: the part of the molecule containing only carbon and hydrogen is the non-polar part. all weird and wonderful add-on substituents make the molecule polar.

1 hour of boring mathematical 'applications' lecture + congregating with weirdo maths nerds around the state + having your name placed in alphabetical order instead of by rank = don't bother going

wtf??? wot indicator are you using? is it an acid-base indicator? i'm assuming you're doin the agar plate thing...

err...to my often-dodgy memory, i recollect it's thiocyanide (SCN-). Basically an addition of SCN- anions to Fe3+ will give a deep blood-red [FeSCN]2- complex. Addition of SCN- to Fe2+ won't do anything. This is basically to tell between Fe2+ and Fe3+

errr...it'll be many years from now that we'll be in a position to make mistakes on live people. as far as i know, we still won't be allowed to cut anything after our med degree in 6 yrs time...

we're working with dead people now. because of lack of funding, they've been dead for a very long time. but apparently, we only touch dead people only for the first 2 years. you get to play with live people from second year onwards.

doctors who hate people go into research. then you can conduct all sorts of cruel experiments....

maybe you could talk about australia's Collins class submarines...:p

Na(s) -> Na+ + e- (oxidation of sodium) 2H2O + 2e- -> 2OH- + H2(g) (reduction of protons in water to form H2)

angle ABR = angle APR angle QPR = angle QSR thus angle ABS = angle QSR thus BA||SQ (corresponding angles equal)

here is a bit more tips. may be a bit repititious, but anyway: * if there is any mention of multiple roots, be prepared to differentiate the damn polynomial. * questions on multiple roots often go like this: p(x) = ax^3 + bx^2 + cx + d has a double root. a) find what it is b) hence...

actually the RACI chem quiz shouldn't be a hard test. It's simply because NSW's HSC chemistry course is full of crap...

use da/dt = vdv/dx initially we have velocity = U, displacement at ground altitude (i.e. displacement x = R) so we have I{U->v} vdv = I{R->x} -k/x^2 dx this should get you (1/2)(v^2 - u^2) = k(1/x - 1/R) Given the accelaration is g when x = R => da/dt = g = k/R^2 thus k = gR^2 so...

test for Fe2+: add potassium hexacyanoferrate (K3[Fe(CN)6]) test for Fe3+: add potassium hexacyanoferrite (K4[Fe(CN)6]) positive test is deep blue

SO4 - weigh precipitate BaSO4 Cl - weigh precipitate AgCl CO3 - (i) add known amt of excess HCl, (ii) boil gently to expel CO2, (iii) backtitrate with NaOH idunno whether u need to actually "know" these also u need to know NH4

if i remember correctly, you can win a lot of money if you happen to be in the top six. can't remember how much though, but it's pretty good...

prolly someone smoking in the lift?

heh...woops sorry lemme do this again: P(x) = (x-b)(x-c)+(x-c)(x-a)+(x-a)(x-b) = 3x^2 - 2(a+b+c)x + (ab + bc + ca) P'(x) = 6x - 2(a + b + c) If P has dbl roots, then there is one root (call it r) s.t. P(r) = P'(r) = 0 P'(r) = 0 implies r = (a+b+c)/3 then P(r) = 3{(a+b+c)/3}^2 -...