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Ok..so for HSC next year: Advanced English Mathematics Ancient History History Extension Biology Food Technology Freaking out because I know half of them scale pretty badly...ahh! Dropping chem because it sucks...im topping it and know it scales better but..it really does suck...

I keep coming across these sort of questions in past papers and have NO IDEA where to start. Any help would be much appreciated. =) A chemical reaction between soluble potassium iodide and a solution of lead nitrate produces an insoluble lead salt as a precipitate. If 2.0 grams of the yellow...

Why is it useful to know the molar heat of combustion of hydrocarbons? I understand that I can help with determining the efficiency of them as fuels but apart from that...