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just a quick question.. when converting degrees to kilometres..how do u know which method to use, because they both give different answers. ie. do u: -- multiply by 60 to give the nautical miles, than multiply by 1.852 to give km; or -- find it via the arc length formula, putting the degrees...

hey thx a lot guys, i think i kinda get it now.. so basically the iron catalyst attracts the N2 and H2 and bonds with them...but now that both the H2 and N2 are on the iron, they see each other and are attracted to each other more than they are attracted to iron..so they bond with each other...

how does it position it?? wouldnt that mean it would have to react/attract in some way

i know in some reactions, catalysts provide a larger area for the thingos to react on (like in the haber process with the magnetite).. but how exactly does this lower the activation energy/speed up reaction?? does it do something to the bonds of the reactants? i just dont understand how...

thank you v. v. much i feel so dense :p

not quite sure where to post this, so ill just post here and hope for the best .. in the Spotlight textbook pg. 197, it says an amine solution is used to remove impurities such as CO2 from the ethane fraction (previously obtained from distillation). It says the acidic CO2 reacts with th weakly...

ohhh..i think i get it now ..thanks dude! :D

Why exactly is ozone more reactive than oxygen? I understand that it's because the coordinate covalent bond in the ozone is less stable, but why? I mean..if you think about it...doesnt ozone basically have a triple bond - a double and a single. Whereas oxygen only has a double bond. So why than...

i dont get whats so funny?

hey! i get it! thats so simple.. im kicking myself right now for not knowing how to do it... gargh, thanks a lot guys! you've saved me hours of anguish :p i can tell who'll be getting top marks in their hsc... //EDIT__ oops, looks like some of you have already finished your hsc haha

oh shat, im such an idiot, i thought for the poker machine was u could get each suit as well.. but for the letters of MATHS.. how come its 3! divided by 5! ?? i mean, i know its the right answer and everything (and i thank u muchly for doing it too lol) but why do u do it that way? sorry if im a...

hey guys, i am absolutely fc*ked for probability :( .. im only up to ordered and unordered selections and already im stuck.. the following questions are the ones i just cannot get the answer for and i have no idea why.. theyre probably really easy, sorry .. 1. A poker machine has 4 wheels...

did morgan cross red eyed females + white eyed males.. or white eyed females and red eyed males? ive read/heard so many conflicting statements on this.. :chainsaw:

does anyone know how i would go about writing an equation for the reaction of calcium and americium to produce ununpentium..which then decayed to form ununtrium.. =S ive tried by they all turn out wrong and im pathetic when it comes to mathematial things...even ones as simple as radioisotope...

thanks guys u rock! XD never thought a topic such as this could be so confusing heh

what the frack is the difference between urine, uric acid and urea? :mad: .. even my teachers dont know, or give some really weird fuzzy answer that has no relation to the question.. i think it's that urea is the solid...uric acid is the concentrated solution, and urine is the dilute...

why is it that umarried couples (homo OR hetero) can't adopt a child.. yet single homo OR hetero can.. wouldnt it be in the better interests of the child to be adopted by the 'defacto' couples and hence have a more nuclear-style family and greater financial support?

identify polyethylene as an addition polymer and explain the meaning of this term outline the steps in the production of polyethylene as an example of a commercially and industrially important polymer putting these two dotpoints together, it sounds like polyethylene is made by addition...

hey thanks! it did help..a lot.. woo~ i have now finished the maintaining a balance part of the syllabus, go me [and u guys lol]!

identify the role of the kidney in the excretory system of fish and mammals ^ im having a lil bit of trouble with this dotpoint..despite its simplistic nature.. its just that some people say they have the same role, but different ways of carrying out that role.. while others say freshwater...