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No problemo. Hope you enjoyed that.

I guess so. :p

It sounds like 30 September is the last day.

LOL, me too. I just couldn't be bothered to quote. I wasn't talking about you! :p

Haha, damn right. Especially when your personal attacks don't even make sense. :rolleyes:

Practise essays for English. http://community.boredofstudies.org/showthread.php?t=65201 http://community.boredofstudies.org/showthread.php?t=3734 http://community.boredofstudies.org/showthread.php?t=12193 ... And more in the School forum.

HCl + NH3 → NH4+ + Cl- The H+ is transferred from the HCl molecule to the ammonia molecule forming ammonium. I don't see how neutralisation is a good example of a proton-transfer reaction, unless you use the one above which does not produce water and therefore probably wouldn't make a good...

I think you're misunderstanding the purpose of this particular forum. General Discussion on the HSC is meant for HSC-related, study-related topics. Your last thread belonged to L&R. This one belongs to NS. Stop trying to look studious by posting in this forum. :p

Haha, I know that feeling only too well, and I've been with him for 2 years. :p I talk to my boyfriend a few times every day. He's always encouraging me to study. I feel like a major bludger if I chat all day, and I love it when he's proud of me, so I guess that's my motivation...

I guess you're asking the wrong two people. :p Does the answer section explain how you get the answer? Hmm, the 6! is the arrangement of the non-E letters, the 7C3 is the number of combinations of 3 letters from 7. Exactly which 7? And the 3! must be the number of arrangements for the E's.

Wow, I was confused big-time. I was like, 100% sure I typed up the purification process awhile ago. :p Anyhow, hope that helped anyway, there's something on additives here. Oh and yes, we do need to know that crap. PURIFICATION OF WATER Screening: Water is passed through a sieve-like...

That's really smart. Why am I not surprised it came from you? :rolleyes:

Me too. I'm very tempted to tell. If anyone wants to know, please say so.

Ich nehme keine Drogen. :p Ich bin weder genug gestreßt noch unglücklich noch unternehmungslustig, um an Drogen zu wenden. Wie viel lernst du?

You know why it makes no sense? Because limewater is calcium hydroxide. :p Calcium carbonate is found in limestone. It is a white precipitate. When carbon dioxide is present in the clear Ca(OH)2 solution, it reacts with the calcium hydroxide: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)...

http://community.boredofstudies.org/showthread.php?t=29416

80%'s not too bad. You're absolutely right. They will have added difficulty next year because they have a weak foundation. Happy studying.

Yes, it would be a good idea to do some revision questions. Preliminary stuff is assumed knowledge in year 12, so it won't do to forget it all.

NO2 leads to the formation of photochemical smog. NO2 + sunlight → NO + O, then O + O2 → O3 NO2 + O2 + carbon compounds + sunlight → PAN PANs are peroxyacyl nitrates. The simplest PAN is peroxyacetylnitrate, CH3CO-OO-NO2.

2. Find any x values for which the gradient of the tangent to the curve y=x^2-3x-1 is parallel to the line x-2y-1=0 2y = x - 1 y = x/2 - 1/2 . : m = 1/2 y = x2 - 3x - 1 y' = 2x - 3 It is parallel to x - 2y - 1 = 0, therefore m = 1/2 1/2 = 2x - 3 1/2 + 3 = 2x x = 7/4