Recent content by science

When do applications for Kensington Colleges open? I've been checking the site and looking at the online application form but it still says for 2015 semester 2 :/

Hi guys, so i finished hsc last year and this year got an email that i got an AAA. Yay. Only thing is i am on a gap year so i thought all g ill reply with the form when Ive re enrolled, because from my skims of the email i swear it said only reply when you are enrolled. However i decided to see...

Offered position at unsw :) Atar: 98.20 Umat: 93rd percentile Through rural entry but unbonded :)

Hi guys, pretty much as the title says. If i accept an offer from qtac, will i still be able to get an offer from my uac preferences, or does gtetting the qtac offer and accepting it change that in any way. Thanks in advance

Hey guys, As in title. Was the one going perpendicular to the aethar wind, or the one going directly with and then directly against meant to be slower? Cheers Rory

sheeeeeeeit that was a hard paper

hmm ok. Do we have to know how to find if a reaction is spontaneous or not? Or is that outside syllabus?

yep, now is an endothermic or exothermic reaction spontaneous?

Ok i have over thought this too much, what is the delta H of a spontaneous reaction? I thought -ve delta H would be spontaneous, but then i realised combustion has a -ve delta H, and you have to put some energy in for combustion (eg. lighting it). So therefore +ve delta H is spontaneous? This...

Ah costly thats a good one. Damn I don't use Cobalt 60 but thanks anyway. Thanks for that one about Tc-99m Cheers Science

yeah like I said i just feel like thats all i say, and thats really only one disadvantage. Do you talk about anything else?

So benefits for radio isotopes are pretty easy- Sr 90 in industry is good because higher quality materials, doesnt have to be replaced often, can be automated etc. and Tc 99m in medicine is good because better diagnoses therefore better public health, allows for greater research etc. But...

Thanks guys, of course leaving sig figs in final answer etc. :)

Ah ok that makes sense. Yeah , thats another one I've seen. Every source seems to have different identification reactions

Hey guys, just been consolidating my notes for identification of anions, and for PO4 i add Fe2+ which gets you Fe3(Po4)2- an insoluble ppte. However, one of my notes says this ppte is green, but after looking it up to make sure- wikipedia says its brown? What's correct?