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lol :p what does CC say? It's not too late to realise that CC is not good with numbers :p

Maybe your brain is missing a mathematical department for chemistry? Not that I ever said you need to remember anything numerical... At least not to you ;)

One of DNA's role is protein regulation, that is, DNA carries the information required for the production of proteins, and proteins are coded by a sequence on the DNA - which you would call genes. (DNA is first transcribed to RNA, a complementary strand to DNA. The strand of RNA then undergoes...

We are always tempted to discard the results that are waaaaaay off :p (obviously something has gone very wrong if we are talking about 10mL...) However, if it's a matter of ~1-2 mL and you only have 3 results you should ALWAYS average all 3 of them. You can't justify that the first result...

I think you are referring to weighing the electrode/the piece of iron that is corroded but NOT the entire test tube. As the equation you have post shows that Fe is lost by oxidation in rusting, therefore the piece of iron you have in the test tube will lose weight =) And by working out the...

The convention is to report the answer with significant figures that is the same as the number that carries the least significant figures. e.g. 0.125 x 0.40 = 0.05 ------> (0.40 has the least significant figures, which is 2 in this case)

Do you use CC? Everything is in it =) (P.443-453) Basically cellulose and starch are both polymers of glucose. The only difference is the orientation of individual glucose units. At this stage it's best to remember it this way: cellulose have -CH2OH groups on opposite sides whereas starch...

i) 2COF2 -------> CF4 + CO2 ii) 2COF2 -------> CF4 + CO2 Using ICE: I ------ 0.2, 0, 0 C ----- -0.16, +0.8, +0.8 E ----- 0.04, 0.8, 0.8 (Clearly, you work out the concentrations by dividing the amount of substances in moles by the volume...) The equilibrium constant K, for this...

Aww.. You can do it! Don't give up just yet :) There's still enough time to get a decent UAI if it's really as bad as you have described ^^ Cheer up!

Why don't you make one yourself instead of being a lazy bum?

But why? ;) I should make awareness to the fact that the dot point says explain. stargaze, hint hint, this is electrochemistry. Have a look at the factors that affect an electrolytic cell and see if you can come up with a reason why this is so (and perhaps also the equations involved in a...

O_____o... I would if they give me free chocolate :p Bed time for me ;) You should sleep early during the HSC too ^^ G'night!

Sorry.. I didn't see the second part of your post: Q23: Alright, in 25mL the diluted sample you get, say, n mols of aspirin. So, working backwards, in the 100mL (before you divided the solution into 4 parts) you have n x 4 moles of aspirin. Now, because you have only taken 10mL of the...

Umm.. Q17: looks resonable, it's not asking you about cellulose, it's asking you about the hazards and what you would do to minimise that hazard. (hint: H2SO4 is used) Q18: they are not asking for specific, they're asking about beta emitters are produced. Q19: that looks kind of...

Did you mean this? E 0.06 - x = 0.02, 0.05 - 0.5x = 0.03, 0.04 If so, not quite because the reaction is 2SO2 + O2 -----> 2SO3 You should write: E: 0.06 - 2x = 0.02, 0.05 - x = 0.03, 0.04

No, the question was not stupid at all :) *ahem* *thinks for a moment* Well, if it makes you feel any better, I didn't even get into band 6 '-___-

Oh goodie ^^ If you ever do Chem or Advanced Science you'll definitely bump into me :p

Did I hear sarcasm or was it just me? *scratch head* (Or was it a complement? :p) I'm 99.9% sure that I knew less chemistry than you do when I was doing what you are doing now ;) (besides, you know how bad I did in the HSC for chem) *blush* ICE equations are not a load of cr*p...

Dreamy :p That's because the pKa of the second ionisation is 1.99 not uber negative infinity (like the first one) ^^

Goodie =) So you get it. And I don't think I know anyone who did industrial chem... I'll let you know if come across someone :)