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a) I'm not sure if I understood your question, but I think that's right. b) I have no idea what you just said =O c) Neutron bombardment ONLY produces non-transuranic elements and number 93,94,95. Accelerators are used for >95 elements. So if you get that question, you'd say that non-transuranic...

For making transuranic elements, linear accelerators or cyclotrons are used. They are done by targetting U-238 with smaller atoms, like carbon, nitrogen, etc... HOWEVER, the FIRST 3 elements after Uranium, ie. Np, Pu, Am, can be made using a nuclear reactor. Nuclear reactors can also make other...

Learn it, you'd need it.

Re: 回复: Re: Prempt the Questions Thread That's actually good lol. It guarantees you 5 marks =P What's worse is them giving you a 5 mark question you HAVEN'T seen =P

Re: 回复: Re: Chemistry Question HSC 2007 Thanks man =) You too.

Condensation polymer is a polymer created by removing a H2O molecule to join two monomers, eg. Cellulose is a condensation polymer of glucose. CH2CH2 is the 'condensed structural formula' for ethene. It's just a lazy way to make structural formulas. Like say 1-propanol. The condensed structural...

Sorry, I was addressing the OP in the last part of my post xD Forgot to quote OP xD Only the "lol chemistry olympiad training =O" bit was directed at you =P

It doesn't matter if you write ethylene or ethene, but when it asks you for an IUPAC or a systematic name, it's ethene. If it says 'common name', it's ethylene. You can't write H2C=CH2 as H2C=H2C, as that would indicate that it's a carbon-hydrogen double bond, which is highly incorrect xD I'm...

Pretty sure it's a typo, but to avoid confusion, he meant 3mg x 1/0.35

You do it mass:volume, or volume:volume. It's basically what it sounds like: How many parts of that substance is in 1 million parts of that mixture? Say you have 3mg of NaCl in 350 mL of soil Then the ppm of NaCl will be 3 x 1/0.35 =8.57 ppm

That's what I always thought. I'm assuming that the Pb electrode is the thing that gives the battery its shell life, but I'm not sure.

Who the hell said he needed 99.6 UAI? He said he needed 82.55. And he'll probably get it if he works really hard from now until the HSC.

Which school do you go to? Assuming a school in around rank 200/300, I'd say 59-61

I calculated it based on your percentiles. I'd say around 81/82

Haha yep xD Extremely well, for me, means extension 1/2 maths xD

Band 6 is 90 aligned marks, yes. No clue about raw marks. No one has a clue about raw marks.

Best thing to do now is doing past papers.

ΔH = mCΔT = 200 x 4.18 x (45-21) = 20064 J So if only 20064 kJ of heat is required, and 1 mole of ethanol gives 1367000 J, then we need 1/1367000 x 20064 = 0.0147 mol So mass required = 0.0147 x (2x12 + 6x1 + 16) = 0.675 g

Modern doesn't scale extremely well, but it does scale quite nicely - around the same as physics/chemistry

http://www.uac.edu.au/pubs/pdf/2007_table_A3.pdf