Search results

Hello, Currently i have 12 units, economics and biology begin my lowest (economics has just a slightly higher rank than bio) Does the board take the one that has the MOST EFFECT on the ATAR? Or does it take the one that has a higher HSC MARK? Thanks

re: HSC Chemistry Marathon Archive dingos and donkeys are funny animals

re: HSC Chemistry Marathon Archive There is conflict in this. Davy proposed that acids contain hydrogen, later on in life, Justus von Liebig reacted acids with metals and therefore conlcuded that acids contained 'replaceable' hydrogen (there is evidence in Jacaranda) Would you say for Davy's...

to make sure its correct, google 'percentage sulfur in lawn food'

bump

let polynomial be y I got (0,-1) being a point of inflection and (3,26) being a maximum As x--> -infinity, y --> - infinity As x--> infinity, y--> -infinty It looks like a mountain

So find the stationary points of the polynomial and their nature, then draw up a quick inaccurate graph and there should be 2 x-intercepts

BaSO4 <--> Ba(2+) + SO4(2-) n(BaSO4) = (1.03)/(137.3 + 32.07 + 64) (via n=m/M) .: n(BaSO4) = 0.0044....mol Now for every mole of barium sulfate, looking at its chemical formula, there is only 1 sulfur atom in it Hence n(BaSO4) = n(S) .: n(S) = 0.0044...mol .: m(S) = 0.0044...x 32.07...

LOL yeh

Thanks :)

re: HSC Chemistry Marathon Archive 1) Changing the amount of solid in an equilibrium has no effect as solids have a constant concentration, so if you increase conc. of calcium ions and hydroxide ions, the system will adjust to minimise the change (Le Chatelier's Principle), hence it will favour...

Ah they 'push' it out...thanks! I remember looking at solutions for some paper and they said that the IONS actually move from half-cell to half-cell...lol, if i can find it, i'll post it up (i think the question is in the chem marathon) ahh ok, thank you!

The salt bridge in the galvanic is cell is used for the migration of ions between half-cells for neutralisation of excess charge Say we have a galvanic cell: Mg(s) | Mg2+ || Cu(s) | Cu2+ (where magnesium the anode and copper is the cathode) As time progresses, magnesium is oxidised into...

re: HSC Chemistry Marathon Archive Question: Identify the systematic name of citric acid

re: HSC Chemistry Marathon Archive Consider polyprotic acids/bases

re: HSC Chemistry Marathon Archive (C)

re: HSC Chemistry Marathon Archive Thank you! BUt can someone else please CONFIRM?

re: HSC Chemistry Marathon Archive sorry supersaiyan - u can say nothing about the salt bridge

the way u typed it confused me Thought it was (Cr2O2)(7-) instead of (Cr2O7)(2-)

Another example: Mg2 (s) | Mg2+(aq) || Fe2+(aQ), Fe3+(aq) | C(s)