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I've been doing some past exam paper questions and I've found that the main ones worth around 6-8 marks are to do with: - Ethanol - Batteries - CFC's and the Ozone - um...can't remember the others Does anyone else know of some others that they've come across. Please post it here!

Yeah that's my problem.... I think electronegativity is first and then alphabetic is next. But I'm not sure! X_x

I.e. Dry cells. I know there are two types. One is alkaline but what is the other called? O_o ... my questions are getting dumber and dumber... XP Chemistry of Alkaline cells -Redox reaction between Zn and Mn + equations -Electrolyte KOH

Ooops it didn't come out right.... Just imagine that the lines are above and below the C's.

How do you name this? F F F H | | | | H-C-C-C-C-H | | | | H H Cl Cl Is this called: 1,2-dichloro-2,3,4-trifluorobutane OR 3,4-dichloro-1,2,3-trifluorobutane ?

Okay! Thanks!

Yes this too belongs in the Forensic section, and again my reason is not many people go there! XP How does gas and high performance liquid chromatography work? How much detail will we need to go into? This is what I know of them... Gas Chromatography: Moving phase: carrier gas Stationary...

So can you say that HCl dissociates into H+ and Cl- ions?

Okay, I know this should be in the Forensics section but not many people look there! XP Anyway, do we need to know about alpha and beta glucose? If we do, what is the difference between them?

ppm and ppb? How does gas and high performance liquid chromatography work? How much detail will we need to go into? This is what I know of them... Gas Chromatography: Moving phase: carrier gas Stationary phase: liquid on the sides of the tube Advantage: fast Disadvantage: need high...

I know dissociation means to separate and ionisation is the process of a compound being converted into ions, like in acids where HCl ionises into H+ ions and Cl- ions. But what is the main difference between ionisation and dissociation?

For the last two days I've been attempting some past HSC questions and there is still so much I need to cram! XP :bomb: I haven't even begun looking over some notes that I've collected over the internet, i.e. HSC online. <= Okay I know that's my own fault... Anyways! Does anyone have really...

Wait a second...is it possible for a noble gas to be involved in a coordinate covalent bond? The group's outer shell is filled up right, i.e. 8 electrons floating around?

Thanks SkimDawg, danz90 and Trebla! It's a bit more clear now! :)

Excellent! Thank you very much danz90 and Trebla! I feel a bit relieved now! :rolleyes: <!-- Added by James for Benefactors: 11.30pm, 8 Feb 2005 -->

How can you tell when a compound has a coordinate covalent bond? I know some of those compounds (ammonium ion, hydronium ion?). Are there any others that you guys know?

My problem is that I tend to round off a little to early or round off too late in my calculations, e.g. titration concentrations, etc. I've been told that rounding off to three significant figures is good. Is this true? I'm always soooooo close and then I stuff up in the decimals... :mad1:

You seem like a band 6 student actually! :uhhuh: You must have studied really hard. I wish I had put more effort during the holidays *sigh* 'Was and will make me ill' - Lenina from Brave New World XD <--I memorised that quote and I didn't even end up using it!

I got k=2 and k=-1 Discriminant formula --> inserted info into formula --> whatever it is equals zero as it has real roots --> and solved it! I think that's it... um..I don't have any questions at the moment. I'll post one up when I find one!

I drew a (pretty cruddy) picture. I didn't even consider drawing a flowchart...maybe you could, I'm not sure. I can't remember the question exactly. Wait a sec...it did say to label parts didn't it? I think by that it meant the ear parts on the diagram...pinna, ossicles, cochlea and yea...