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Divide the mass of nitrogen by its percentage composition to get the mass of the whole compound. That long thing I divided 100g by is just the exact percentage of nitrogen in ammonium sulphate (around 21.2%, but that's not the exact percentage, remember) :D Btw, I thought Gouliaev's good. I've...

Least confidence? Ugh. English.

Everyone did the first 2u assessment task, and after that it's by choice. Just in case you think you might drop 4u, or maybe you just "wanted practice"...

Thinking of work as exams sometimes help. ... Sometimes. Or one of those if-you-don't-you-must-die things that you absolutely definitely must do over everything else :D

Am I dodgy today? That's what the girl next to me said in chem. Maybe I am. ... Just a bit. :D:D (Of course, ignore my behaviour of sneaking up to the front and flipping through the teacher's textbook when she's not looking, pulling an "I didn't get that" face all the time, feeling...

Can't do anything about it now, so gear up and aim for a better mark next time :D Listening to others' judgements of whether you "failed" or not wouldn't help, and the judgements would most probably be inaccurate since we don't know your ranks and the typical performance of your school :p...

:rofl: Journeys... (I don't even wanna hear that word. Like most other fellow year 12s. Heh.) Btw, how about having animations on navigation bars? As in, images on the button light up and move around when your mouse hovers over it. Just an idea :D Good luck `kyttie :) Last year the...

OK. Sit back and relax. You have your choice :D

There there. Same boat here :o Just try to avoid stupid mistakes and try to be more psychic next time, ay?

The reason you can't "cancel out" CH3COO- ions is cos most of them are not in ionised form, but in fact in acetic acid molecule form. So you'd need to show that it's not simply an interaction between H+ and OH- ions, but also the dynamic equilibrium between H+ and CH3COO- ions. Not sure...

Oh, so Twin Paradox is included in the syllabus? Cos I remember the other day my teacher just told the whole year that it's not :p

I would think that this question was already answered in my explanation :o lol. You just gave your own explanation there :p But yeah, like xiao said, Earth can be considered an inertial frame cos you're not looking at its motion relative to the sun or anything, and since the rocket frame...

Hey there :wave: Maybe you should ask Conroy to explain more too :p How did you find those? If by mass, percentage of nitrogen in ammonium sulphate would be 2*14/(2*14+8*1.008+32.07+4*16)=21.2%, not 2.13%. And anyway, you could see that these percentages are wrong, seeing that your hydrogen...

lol ok, I will :)

Ahahaha XD No need to feel paranoid, I don't bite. Nor do the few friends of mine who randomly browse this site. Feel safe <3 So did you drop by the badges stall? I was doing the machine bit, mostly :D Heh, I don't think any of us actually walked, we just took the buses ourselves. ...

Unless she was pointing to the fact that she's had her half yearly and got back the paper already, I can't see anything scary about it :p In the same boat here Locky Jr. I hate half yearlies in March and getting them back in March too :mad1:

School Walkathon today, us year 12s held stalls at this park, uhh, near...a...bay...(dunno what it's called :o) while the rest of the school walked down there. I was doing the badges stall, putting the metal ring and metal back into the machine, wait for others to cut out the designs (could be...

Cos I'm an extreme escapist? :o

Heh, I use my left hand to shake the flask while using my right hand to control the tap, and sometimes while I go drop by drop near the end point, I stop every two or three drops and wait for the colour to settle. But then that could take a long time :p

The only thing I wasn't sure about was the final volume by which you divide the number of moles of NO3-, a bit ick about that 500mL. But I really can't think of an alternative so...enlighten me? :o