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Some texts are telling me we add hydroxide to hard water to precipitate out the magnesium as magnesium hydroxide, which would work since that salt is insoluble. It also says to add carbonate ions so as to precipitate out the calcium ions, as calcium carbonate is insoluble in water. However...

Yeah this is probably the most sensible method (e.g. the one I would think of in an exam). Thanks a lot dunja!

OHH LOL i get it, but i feel so dumb now. sorry my brain's been switched off recently

What do you mean 'separating out terms in the integral'? What happens to the n's in the coefficients?

OK everything looks good except going from the 1st to 2nd line. Are we expanding? Shouldn't the expansion be n + nx -x +nx^2+.... (i.e. dunja's working out). I mean can you explain to me with words what we're actually supposed to do?

Nws mate, good luck with everything

Be careful with Q6. The inflation rate is not just the raw CPI figure, but the year to year change i.e. Inflation rate= (Year 2 CPI - Year 1 CPI)/Year 1 CPI * 100 The CPI is still increasing but at a slower rate, so the inflation rate is falling. With question 19, you also have to recall the...

I can't do part ii wtf. Dunja how did you go from the 3rd line to the 4th line of working out; how do you simplify 1+2x+3x^2 + ... (n-1)x^(n-2) . I don't see how you can use the result of pt i since the coefficients are different

Hm that's actually quite insightful. Thanks a lot!

Anything that hasn't yet been asked? I'm feeling a couple of those obscure pracs that no one ever does coming up.

Bump!

When asked to define a surfactant, you'd usually say something to the effect of "a surfactant is a substance that reduces the surface tension of the liquid it is dissolved in". When talking about the cleaning action of soap, we say the long hydrocarbon chain attaches to the greasy surface and...

Oh believe me I overload on techniques AND explain them AND then go onto answer the question. I'll see if I can find my trial paper.

That's the point. Once you say "oh he stabbed the cops" people will be fine with shooting someone. What if the initially stabbing was all a fabrication? Anyway I believe it in this particular case but you shouldn't take everything at face value. In many past instances in America there were cops...

He's talking about the legitimacy of the situation. Whether the police were within their rights to shoot at him. I can agree with that point actually, it's always healthy to exercise some skepticism and not give 100% of your trust to the government. But yeah in this particular case there...

I'm sorry but the issue cannot just be put down to people being "uneducated" and pigeonhole it away. - Imagine you have Ideology A. Ideology A has some teachings that are quite simply violent or barbaric, even in their correct context (before I get jumped on, please see this...

^^ Very insightful post. I still think there's people that will read that and say "i'm willing to do all those things", and you know what? good for them. i love seeing people who are truly passionate about what they do. but on the other hand, i think status, image and 'prestige' are some of the...

smart people take days off. champions drink coffee and power through. there's only like 6-7 weeks before it's all over. just go hard, target your areas of weakness and smash it (e.g. instead of just doing the easy maths q's x1000, spend more time on a couple of the really hard ones)

Tired? Someone hasn't discovered coffee. It's the fuel of the HSC my friend.

I usually get 12-13/15 in this section but I think it has the potential to be the easiest section to improve on. I almost always get 4/5 for the last question. How much should I be writing 2 mark question? How many techniques? inb4 'Practice'.