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I don't mean to sound like a prick, but did you, by any chance, get that from me? I was very unsure about this, because my sources contradict each other, however, I asked my tutor and he said iron (II) hydroxide is creamy white, quickly turning to brown. I think I'm going to go with that...

Beta particles (electrons) come from the nucles of the atom, not from the electron cloud. The nucleus contains only protons and neutrons, so to emit an electron, the neutron "decomposes" to give an electron and a proton. 10n → 11p + 0-1e The atomic number represents the positive charge on...

Is that shipwrecks?

Haha, Ich mache auch komische Fehler! :p In einem Aufsatz habe ich geschrieben: "in unsere heutig society". Jetzt glaube ich, dass Mathe total Zeitverschwendung ist. Ich finde es nicht schwer, aber es ist zu zeitraubend. Ich habe den ganzen Tag mit Mathe verbracht. :( Was für Musik hörst...

Could some please confirm that the answer to question 7 (b)(iv) is 4 pi? Even better, if someone knows where I can find answers to past HSC mathematics and extension I papers, could they please post it up to prevent me from making another 6372846382 confirmation-of-answer threads in future? :)

Thank you very much. :p No, it's actually this morning's news. :p Gosh, wouldn't we be screwed if that was in the exam. I really doubt they would go too deep into that point. The main points are flavouring and preservation of food, back it up by the characteristic sour taste of acids and the...

I think that's no longer in the course. Wait for someone else to confirm it. :p

Ah, wirklich? Die Eltern unsere Schüler sind nicht eingeladet. :p Nach dem HSC gehe ich nicht zum "Schoolies". Ich gehe mit meine Freundinnen und meinen Freund aus. Ich habe nichts Besonderes geplannt, aber es ist mir egal - mindestens kann ich endlich mich gut entspannen. :p Ist "STUVAC"...

http://community.boredofstudies.org/showthread.php?t=86706 :p Frig got there before you.

milli - 1/1000 of something. :) nano - even smaller. :p Don't worry, HSC chemistry doesn't usually deal with these terms. Just moles is all you need. For your question, there was no other way than trial and error, but since the identities of the elements (oxygen and nitrogen) were...

Maybe she just thought she was gaining weight. Maybe she was embarassed. I don't know. Or maybe, like in House, she didn't want to get it removed because her husband finds her more attractive with a big belly. :rolleyes:

Good one. Now even less people are going to feel inclined to read the Bible.

Yeah, I watched it. Very interesting. I didn't start watching from the beginning, but why did that woman wait until her tumor was 90 kg to do something about it?

Ja, ich glaube. Ich spiele seit vierzehn Jahre das Klavier, und ich habe die achten Prüfung gemacht. Ich bekam ein A. :) Aber dann machte ich die neunten Prüfung, und habe durchgefallen. :( Jetzt habe ich zu viel zu tun, das Klavier weiter zu lernen. Ich spiele es, wenn ich Zeit habe, oder...

Really? Are you sure? :confused: Sulfur has 6 electrons on it's outer shell, so it would make sense if it had two coordinate covalent bonds. But as I said, I'm only going for d) on the grounds that it's correct regardless of whether or not c) is correct, and I'm not sure what those lines...

This is what happens when he writes his own speeches.

Nobody has answered this question yet, I'm quite sure the answer is d). I'm not sure what the lines between the oxygen atoms in c) mean. Does anyone know? Anyway, I've attached a Lewis dot diagram of phosphate, and since d) is not wrong and c) is confusing me with it's oxygen-oxygen lines...

Technically, chain-stiffening.

Thanks Casmira. There's another thing I'm confused about. What is the the colour of the precipitate iron (II) hydroxide? That is, when hydroxide ions are added to a solution of iron (II). Some textbooks say white turning quickly to brown, but others - and my tutoring notes - say...

Describe the formation of a coordinate covalent bond. It does not specify which compounds, but the common ones are ozone and ammonium, so know them. Ammonium appeared in our trial paper. As for the nuclear chem question, the answer is D. 23892U → 23490Th → 23491Pa → 23492U 23491Pa →...