Search results

Omg :o Xiaoie! You're still here o.O Anyhow.. wrxsti, personally I wouldn't even bother thinking that Cl- is a weak conjugate base of a strong acid (or think of Na+ as a weak conjugate acid of a base). Of course, that is technically correct - but I never even bothered thinking that :) So...

Kylie, don't ask me ;o Ask Kitty

Uh... Yes *Waves at Kylie* I can bite :o I don't know what I'm doing ^^; *Disappears from BoS again*

Mm... There's no reason why you can't work out the cell potential when the concentrations are given to you - and for that you need the standard reduction potentials. It's just that the Nernst equation is not part of the HSC syllabus... (Or is it?)

Well, as far as I know, experimentally the protons are not taken simultaneously. The second proton has a high pKa value than the the first one; meaning that it is easier to deprotonate the first proton than the second proton. However, with a strong base such as NaOH, you can assume that the...

Well... Yes and No. Of course the one with a more negative potential means that it is more likely to be reduced than oxidise and you will naturally think that it is the oxidation reaction in your redox reaction. This is in fact true for questions like: Given half cell A is such and such...

Alrighty, have you come across the terms monoprotic, diprotic, triprotic, multiprotic... etc.? One of the classification for acids is how many donor protons they have. Clearly, HCl (Hydrochloric Acid) is monoprotic (can donate one proton per molecule of HCl). Other examples of monorpotic...

There is a reason why the potentials in the table are also known as reduction potentials, and that is because the potentials quoted are the potentials for reduction reactions. That might sound stupid (for stating the obvious) but many people have difficulties doing calculations involving...

Hmm... Riviet, I think the CO2 concentration in the air is rather low to be counted as a major source. The majority of it probably comes from respiration in cells. :) It's just one of the things that nature does ;) The rest's just what dreamy and Riviet said.

Don't dislike the HSC though. Otherwise it'll get you back :D Good luck!

Maybe because I didn't do as well as expected in HSC Chem :p It's perfectly okay to sound doubtful :D And that's the attitude for doing science subjects :p Umm... The way I see it (and many people I talked to) is that to do HSC Chem you need the minimal amount [slightly exaggerated] of...

Just a note due to fussiness on the notation: we don't usually write electronic structures with + signs in between the orbitals. Taking this a little further down the periodic table, you might also want to take note of the electronic structures of of Chromium and Coppper. If you follow the...

Trying to figure out whether the product is K2C2O2 or not is actually pretty much a guess-work if you have never come across the reaction before. Having said that, however, does not mean that you have to do the experiment to predict how the reaction will go. Upon reading the question, the...

An electrolyte conducts because it contains mobile ions which can move freely in the bulk. One can imagine in when you increase the concentration of ions in an electrolyte the flow, you are essentially increasing the ability of the solution to conduct (it's much like reducing the resistance of...

lol... That's good :D According to my experience, the Prelim course was a lot more "Chemistry" than the HSC course. I don't recall reading anything about electronic configuration in the Prelim syallabus (my year 10 science teacher taught us that for fun though :D), things might have changed...

Your teacher is right to fuss about sig. figs. :) There's no point to report something that is of little or no importance, right? A few rules for sig. figs: - Numbers such as 9999, 123, and 46 have siginificant figures equal to the number of digits. (i.e. 9999 has 4 sig. figs.; 123 has 3...

All of them look right to me :)

Nooooooo, those are A-Grade burettes ;) (Or so I think...) Now here's my comeback (even though I may be wrong) :p Well! There is a certain error margin on all burettes (because nothing is perfect). I can't remember what exactly it is but I'm sure it's between 0.02-0.05 mL. I guess, then...

The title says it all :p (omg.. I'm spamming XD)

That sounded funny... :confused: but I'll take it anyway :p