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15 is C dude. You got it wrong. Calculate again. Right answer is C. As for 13, we won't really know the answer till the bos publishes it, Both could be right. have a good day.

i still reckon it's a. when it says in factory it is referring to the material this was produced from. I reckon that was the only hard multiple choice,because ALL the mc were straight forward.

lol.. i usually find chem papers quite easy. sorry if it sounds arrogant but its true haha. the concepts are always quite easy.

yeah ofc. chem is always easy but the marking criteria is always quite harsh.

I think this was a very tricky question. Polyethylene can be made from plant material as well! I picked a because you can't actually make cups from cellulose. But i might just be over thinking this. I'd still stick to a as an answer tho.

It won't increase by that much. We always feel like chem exams are easy but in fact they are always marked quite harshly. Estimated cutoff ~73-4

1.b 2.c 3.d 4.c 5.a 6.a 7.c 8.a 9.a 10.c 11.b 12.b 13.a 14.b 15.c 16.b 17.b 18.d 19.a 20.d

lol. it was a basic equation..? ind+h <---> Hind

I think it went quite well. Except i got fucked over by the last question in chem of art. Either than that it was really good i think! The questions were non generic which is good and there was a fair amount of calculation (probs around 25% at least) which is also good. Hoping for a raw of...

re: HSC Chemistry Marathon Archive I think we've done enough guys. Goodluck to everyone! Hope you all do well.

re: HSC Chemistry Marathon Archive yea yeah. i would have done so in the exam. just ceebs to do it here haha!

TY. Just read through and gives me confidence that I know all of these quite well. goodluck everyone.

re: HSC Chemistry Marathon Archive HCO3 +H2O <---> H2CO3 + OH HCO3 +H2O <---> CO3 + H3O I didn't put charges because it'd look messy.

re: HSC Chemistry Marathon Archive +1

Chem of art is amazing. It's actually not hard at all. It's the best aligning option and it's the shortest one as well.

ethaNOL rhymes with alkaNOL.

re: HSC Chemistry Marathon Archive LOL. I don't do industrial so I'm not confused at all hehe. As for the CO2 + H2O <---> H2CO3 Adding water shifts the equilibrium to the right as far as I know.

re: HSC Chemistry Marathon Archive damn it. Why'd you have to break the chain. I'm devo now.

re: HSC Chemistry Marathon Archive Yes yes. I know what the answer is but i always use equations and diagrams to express each step. Eg peroxide opening up and attaching to the monomer etc etc. which would take like 10mins for me to type up haha.

re: HSC Chemistry Marathon Archive I can't really think of anyway to answer this without using a series of equations/graph. How many marks is it?