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Post up your multiple choice answers here and discuss.

Post your general thoughts on this year's exam paper. Hope everyone did well. :)

I reckon 5-7 marker on Ethanol/Biomass for sure. Possible 4-5 marker on purifying/sanitising municipal water supply. I think there will be something on modelling the ionisation of acids, this year.

So then HDPE production is: Low pressure, Low temp/High temp? Organo-metallic and/or transition metal catalysts are used.

I thought formic acid was the common name of methanoic? Acetic apparently is IUPAC-preferred to ethanoic though, thats correct.

Well, for the actual process, maybe we could mention: - Any excess alkaline solutions used in alkaline hydrolysis must be disposed of responsibly, since bases are corrosive and would greatly increase the pH of waterways, affecting aquatic life, as well as growth of plants - High energy is...

Did you guys actually produce an ester in the lab? We made Methyl Salicylate - smells awessomee. Used in dencorub, when u smell dencorub, ur smelling the methyl salicylate.

Correct :) and Thanks lol

Cheers Jason, you've pretty much got the same ones as in my notes. Just wanted to clarify them all. Thanks :)

One of the three there ;)

Identify the name of the ester below, and the reactants used to produce it.

I'm not sure, my chosen biopolymer isn't Biopol (I'm doing Cyclodextrin).. I just know some recent developments in Biopol.

lol well the furtherst I think they want you to know is that different metals emit light of different wavelengths (due to atomic radii diferences), thats about it.

I think they already have done genetic engineering - they transferred the gene for the production of Biopol to the bacterium Escherichia Coli, since scientists can more easily work this more familiar bacterium, and it produces at a much faster rate. Also, they added propanoic acid to increase...

Can someone please post what they're environmental issues are for each of the industrial processes: -Sulfuric Acid (Contact Process) - Frasch process issues also? -Chlor-Alkali (Electrolysis of NaCl) -Saponification -Solvay Process Cheers :)

I think the ones you have to memorise are: Phenolphthalein (8.3-10.0) Methyl Red (3.2-4.4) Methyl Orange (??) Bromothymol Blue (5.0-7.6)

Yep, you just need to know one method to test for oxygen quantitatively. I've learnt the Oxygen Sensor - basically its an electrolytic cell where oxygen is reduced/oxidised??. The rate of electrolysis/reduction is proportional to the concentration of oxygen. Gotta go over this one again...

mee too i'm just so over this shit i want it to be over!!

HSC Spotlight Chemistry

My teachers were all really good, espcially chem. I couldn't have asked for a better chem teacher - he is an author of a textbook LOL