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If you have air bubbles and you fill the burette with solution to the 0-mark, you will end up with less solution than you need. I don't think it matters which order you do your questions. It might be more confusing for the markers if you don't do them in order, but as long as you answer all...

Lostaussie is right. Nevermind the minimum concentration of H+ and focus on the pH. Because you are diluting the acid with water, you cannot possibly obtain a pH of >7 because the pH of water is ~7. As the acid is diluted, the pH rises, but since the solution can never be alkaline, the...

Citric acid is triprotic. This means it produces 3 H+ ions in solution, whereas acetic acid is monoprotic and produces only one. Both citric and acetic acids are weak acids because they do not ionise completely in solution, while strong acids do. Of course, a weak acid that is monoprotic...

Sodium carbonate is not a catalyst. It's function is to remove traces of ethanoic acid and sulfuric acid that is still present in the distillate.

Oh, we never used sodium carbonate solution. :p Sodium bicarbonate or sodium hydrogen carbonate is baking soda. Its properties are very similar to that of sodium carbonate. I don't see why it makes a difference in esterification, because above temperatures of 60°C, it decomposes into sodium...

12 year olds should stick to dating 12 year olds.

For the first one: Sulfur: Extracting metal from metal ores, burning coal, geothermal hot springs, volcanoes, and sometimes burning petrol. ZnS(s) + O2(g) → Zn(s) + SO2(g) Nitrogen: Nitrogenous fertiliser, combustion, lightening - at the very high temperatures generated by lightning...

You don't even know who your e-partner really is, it could be someone really scary, really old, or really hairy.

You simply can't ignore the fact that there are people who say "I love you" because they mean it.

If he is, he's doing it all wrong! You don't just ignore your girlfriend and block her off every communication device. :p Telling her your lovely intentions would not only make her dig you more, but it would prevent her from worrying, crying, throwing tantrums and wasting craploads of time...

http://community.boredofstudies.org/showthread.php?t=15886&highlight=uniform+exams http://community.boredofstudies.org/showthread.php?t=84952&highlight=uniform+exams http://community.boredofstudies.org/showthread.php?t=45934&highlight=uniform+exams...

Gosh, how immature of him. :rolleyes: Do you see him in person? If you do, ask him about it. You have the right to know where you stand. It's hard to tell which one it is off that list, but they obviously all point to one thing - he wants to be away from you, at least for now. Did you...

Making a list in your head won't make either of you feel comfortale. :p Be yourself and if you're still feeling awkward, then there's something wrong with her. :rolleyes: When I first met my boyfriend, we couldn't stop talking. We talked about the weirdest things, somehow it just all came...

I dug this one up: http://community.boredofstudies.org/showthread.php?t=17924&highlight=recent+discovery+element This was posted recently: http://community.boredofstudies.org/showthread.php?t=86338&highlight=recent+discoveries Hope it helps, I haven't really dealt with this dot point yet. :)

Yeah, you're making the rest of us feel a little.... awkward.

Right now I have none, but I get one or two from time to time. I find that most cleansers are too harsh for my skin. I think it's a lot of Asians that can't hack them because my friends had the same problem. Everything dries my skin out and their moisturisers are ineffective in restoring...

Worst time indeed. You need to focus on your HSC first. For the time being, forget about winning her back, and bury yourself under your textbooks - it might distract you from her (studying distracting you from girls, what irony :p). Have lots of contact with your friends, it works wonders.

My boyfriend and I have been together for around two years, and we're planning to stay together, get married, etc. I'm not going to make this an essay, so in a nutshell, we do everything together and can talk to each other about anything. I love how we don't have to always have plans for going...

I googled up some stuff for you, not too great, but might help: http://hk.geocities.com/xavier114fch/03/03b.htm http://ams.confex.com/ams/AFAPURBBIO/techprogram/paper_78135.htm Keywords being "Photochemical smog, Australia". :)

Hey kiddo. :p You asked this three times now. Don't panic over it. These questions are rarely asked, and they're not difficult because you get them in these packages: Package A: Total mass of compound, identities of elements which make up the compound, and hence the molar masses of these...