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omg I hate shipwrecks :/ i) electrolysis ii) omg 5 marker on shipwrecksssss. I'm gonna be lazy: - electrolysis wait what am I supposed to talk about here? Like the whole method or just electrolysis for 2 methods?

Someone can answer this: Describe a local catchment area and potential sources of contamination to the catchment (3 marks)

yeah I was taught that too but I really can't be bothered remembering all that hahah but yeah the polarographic oxygen probe one is nice and quick. iirc some years they tested Winkler with calculations and stuff but they'd always provide the equation

http://community.boredofstudies.org/17/chemistry/327970/predictions-chemistry-2014-hsc-74.html#post6780903

sadly this is what happens :(( m9 ikr But he wasn't that old or anything

I've answered a part of your question in this thread :) See page 73

Hardness Hard water contains significant concentration of Mg and Ca cations and forms a grey scum with soap, whilst soft water forms a lather with soap. Hard water which forms a grey scum dirties clothes and hands and reduces water quality. When soap is added to hard water, the precipiates of...

OMG SOORRRRY I don't think we saw this. Let's all do some: I'll do Hardness, DO, BOD.

omg lol

ahahah ikr OMGGGG SERIOUSSSSSS???????? How did you find out????? :eek2:

omg are you serious? I feel for you man :/ teachers love leaving students during hsc year. The number of teachers who do this at my school *facepalm*

ahah no worries :))

Something sort of like this

ahah srs our science department is so fkn shit don't even get me started. They can't even teach properly :chainsaw2:

Cool, and you should probs explain the processes briefly beforehand and yeah should be good :)

omg tell me about it, the teachers at our school can't even explain it properly :/

Yes definitely this :) Added into my feedback also

hahahha intended to be a yucky question, soz

omg guys thanks so much I never knew this and no wonder I always get them wrong in MC :/ @QZP I think it's haloalkane

gg