i think the first module has a lot to do with hydrocarbons and stuff from prelim energy module. e.g they start talking about the cracking of hydrcarbons, ethylene (ethene) , addition reactions etc etc the second module i think has a lot to do with the module 'water' from prelim... the rest im not so sure about the rest. and my frendz hu do accelerated chem tell me, as sareb mentioned, you have to know ur moles stuff.I blacked out in second half of energy... lol; do I need to go over hydrocarbons? =S