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Anyone have an easy prac? Also any predictions? I have a feeling its either going to be saponification/ Eqm prac.

The sulfur in the fertiliser is part of the SO42- (sulfate) So thus, the number of moles of sulfur = to number of moles of sulfate Fertiliser as a whole is not sulfate, but it does contain sulfate. It is common knowledge that fertiliser contains sulfate :) Are you doing HSC this year for chem?

Tbh I prefer a paper with calculations : theory with a ratio of 9:1 lmao

That's correct.

Mass of sulfur = 24% of 1g thus m(S) = 0.24 gram. n(S) = 0.24/32.07 = 0.007483.......mol n(S) = n(SO42-) m(SO42-) = n x M = 0.0074836 x (32.07 + 16 + 16 + 16 + 16) = 0.7189....g Thus, precentage = 0.718 g sulfate / 1 g fertiliser = 72% :)

Question: Citric acid, the predominant acid in lemon juice, is a weak triprotic acid. A student titrated 25.0 mL samples of lemon juice with 0.55 M NaOH. The mean titration value was 29.5 mL. What was the concentration of C6H8O7 in the lemon juice?

Volume of a reaction vessel is inversely proportional to pressure, so basically, if you increase the volume you decrease the pressure and vice versa. In this case, the volume of the entire vessel has reduced, resulting in a pressure increase (because pressure is inversely proportional to...

I can actually remember coming accross a few qns in the trial papers that I have done which made mention of Q and asked us to tell whether eqm was shifting right and left. Just to be safe I've learnt it :P Thank you for your answer BTW :)

Can someone please explain the significance of 'Q' in relation to K? If Q < K does that mean eqm shifts right? If so, why? And so forth for Q > K shifting left etc Thanks

Pretty much no difference, they're asking for the same things. Essentially just learn: 1 - When a demand for a certain resource arises, it begins to deplete and become more expensive resulting in the need for an alternative 2 - An example where this has occurred, stating the alternative (eg-...

Cl isn't considered at the anode since the solution is 0.05M concentration, making it very dilute. Thus, at the anode, instead of CL being oxidised, water is oxidised because it is more abundant. ANODE: 2H2O ----> o2 + 4H+ +4e- Since H+ is produced, it makes the solution acidic thus causing...

Prelim was useless. Barely passed it, HSC is the bomb! Easy concepts, calcs may be a little harder but can also be quite repetitive

Notes helped me consolidate my info, I highly suggest you have a look at the Student's guide, and several textbooks and summarise info from all into one :) seriously student's guide is the best, saved my life this year. Also constantly doing papers and calculation questions will put you ahead of...

What about a raw 70 in chem? Thanks!!

They probably won't even realise, as you said you moulded it to the qn + who knows, maybe your mate didn't memorise it. Dw about it

Approximately

Yeah neither can I, can't remember some of them unless I'm in the actual test. Thank you for that!

Hello everybody :awesome: Just wanted to ask, what formulas/data are there that we need to know that are not on the formula sheets. Right now the only thing i can recall is the 'k' constant (magnetic constant) = 2.0 x 10^-7 I'm 99.99% sure there are a few other things that we need to know...

vatssss happnin ma futah lawyaaaaaaaaaa

Wow. This is terrible news and it disgusts me and leaves me feeling mortified that individuals with absolutely no sense of right and wrong can commit such atrocities and call themselves muslim, let alone human. I honestly do not blame anyone who has misconceptions about Islam because of the...