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1. http://www.boredofstudies.org/community/showpost.php?p=886455&postcount=5 2. c = - 1/n+1 3. ²ⁿC_2n*x²ⁿ*1^2n-2n which of course simplifies to x²ⁿ so does Xayma's solution, except his is more elegant ;) u shud really use his method. no...

z=2cis(pi/3) in mod-arg form z^n = 2^n [cos (n*pi/3) + i sin (n*pi/3)] for it to be real, imaginary part = 0 sin (n*pi/3) = 0 etc. for imaginary, cos(n*pi/3) = 0 n*pi/3 = -3pi/2, -pi/2, pi/2, 3pi/2, etc. there wont be integral n for the induction thing... I'll just prove the...

hmm.. but whats flawed in my argument?? that P(if its a boy, its from senior) = P(first student is from junior) = 7/13 ?? also, 7/13 < 49/76 and this really makes me confused... :confused: if first student isnt from junior, the second cant be from senior... but the probability that the...

u get questions from past papers etc especially for ext2 where its very readily available on the net LOL theres this secret library of ext2 papers run by a mysterious person... for ext1, u probably dont need that many questions.. will u do all of them??

why waste money for textbooks?? :confused: as if two books aren't enough... ;) or is it three, patel, fitz and coroneos? (I'll seriously be happy with one book) EDIT I thought this was in ext2 forum.. but anyway... 1 3U book is still enough for me.

I agree for the time being anyway My opinion mught change when I'm in uni.

any help? *looking to Jrah students on the forum... especially the 4U ones* maybe the given answer is wrong after all....

no [EDIT: maybe yes.. I didn't really get what he meant], I thought: if the boy is picked for the second student, 400/700 is for he to be from Senior when the first student is not a boy (so there are still 700 boys total). 400/699 is for he to be from Senior when the first student is a boy...

maybe u can try typing the exact sentence that he gave into google.. maybe he gave u a hint.

well solvay process has several components u shud know all if u can probably just know the main eqns and make up the steps on the spot ^^ brine purification isnt one of the major ones to model, so I'd think that its a little inappropriate... u can assume its pure enough actually.. model...

basically yes. just mention the colour changes as u increase the temp.. (from red to purple), and changes to red again when u cool it down again. mention how u heat it (using bunsen), draw diagram if the number of marks sounds appropriate u analyse the equil qualitatively just by observing...

faraday constant is the quantity of electricity carried by one mole of electrons. it is 96500 coulombs per mole. I dont think u need this.. I havent done this but its in my Conquering Chem textbook but it might be there as an extra. And BTW its not unique for Solvay.. questions involving this...

wel probably its best to read ur textbook and summary from the resources section or from here (http://www.boredofstudies.org/community/showthread.php?t=25844), or maybe the CSU site or other resources. but, in short, well you've answered what emulsion is urself... it can be either...

anions go to the beaker with the anode. and vice versa. the beaker with anode is the positive one (oxidation occurs.. release electrons up to the circuit and so the electrode gets more positive), hence the anions are negative.

enviro issues 1. sulfur (S) is easily oxidised to SO2 or reduced to H2S, both of which are serious air pollutants even at low concentrations. 2. in the extraction of sulfur we use water. it's necessary to re-use it and not discharge it to the enviro becoz it may have dissolved impurities that...

http://www.corrosion-doctors.org/Microbial/srb.htm (or use google for more info) dont think this is in the syllabus though. chuck it to the bin ^_^ (unless u want to know this for interest)

yes yes chem mon and man I hate it :(

if its a cell which is designed to use salt bridge, when u remove it, theres no volts at all ;) because u remove the connection from the two beakers / electrodes

but how do u know it's classified as a "reason"? Is this on the syllabus or textbook somewhere?

probably.. u need to read between the lines.. draw meaning from the not-obvious.. ok I admit defeat :p