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thanks for ur help i think i got the hang of it now thanks!

just some q's if you wouldn't mind answering them for me, thanks :) Q1. Urn A contains 6 white and 4 black balls. Urn B contains 2 white and 2 black balls. From urn A two balls are selected at random and placed in urn B. From urn B two balls are then selected at random. What is the...

i finished by business half yearly just 2 hours ago ill get my marks pretty soon. i think i will get 90, but im very pessemistic (sp?) :D i, and multiple friends thrashed the report part. we studies EXACTLY what it was that was in the report. miscc and ectrfm Managing change...

in the reaction where ethanol is dehydrated, it loses a water molecule because of the concentrated sulfuric acid. in C, i am pretty sure CO2 doesn't form in the dehydration of ethanol C2H5OH --> C2H4 + H2O so yeh, water forms, but not CO2 ethylene forms from the above reaction so its A i...

how did u know that u have to convert the 1.6 into the pi stuff like, i thought that was the degrees in 'y(0.65)=0.56' I must be really dumb lol

Hey will hunting (or someone else), could you please explain your post if you don't mind :) "We know, by substitution, that the graph exists for x = 0 (in the point (0,0)). But y' is undefined for x = 0, ∴ (0,0) is a critical point." critical point has 2 y values, 1 x value? "However...

atleast 2 vowels next to each other = 1 - (no vowels next to each other) = 1 - 1/10 (as previous question) = 9/10 :) *lets hope im right lol*

ok in the 1st one, the vowels and the consonents can be arranged in 2! * 3! the reason why it's not a further *2! is because it doesn't matter if it is AB or BA since it is a circle. (similarly how the 1st position doesn't matter when poeple sit around the table, hence (n-1)!) the reason why...

im sorry i don't understand could you please explain a little more? thanks for ur help :D

1 g put in 100mL 1g per 0.1L .'. therefore there is 10g of solid per litre 20ml is chosen there is 50 20mL's in a 1 litre solution so therefore 1 50th of the 10g in in the 20ml solution 1/50 * 10g = .2g ---------------- ok nevermind, i see you worked it out :)

.1 * 0.0244 = moles of HCL used = moles of NaX used mp = .2 g (10g per litre *.02) .'. .2g / 0.0244 = 81.97 = 82g per mol (mp / moles = molar mass)

hye thanks for ur replies, greatly appreciated sorry, but i have some more questions if u don't mind me asking :) Prove that for al positive integers n, 1^3 + 2^3 + ... + (n-1)^3 + n^3 + (n-1)^3 + ... + 2^3 + 1^3 = (n/3)(2n^2+1) 1^2 + 2^2 + ... + (n-1)^2 + n^2 + (n-1)^2 + ... + 2^2 + 1^2...

i have no idea about 1 and 3 because i dont understand the q's lol i think my hingrish is preaty bad :eek:

Hey all just wondering if you guys can solve these q's for me please 1. A set of cards consists of a red 1, 2, 3, a white 1, 2, 3, and 4, and a blue, 1, 2, 3, 4, 5. If four of them are selected at random, find the probability that they are all either "1's", "2's" or "3's" the answer is...

if u have the chemistry pathways book u can look in there - that text book has about 6-8 i think, fairly detailed too. Otherwise chemistry contexts HSC has a number in there... off the top of my head i think there is environmental chemist, metallurgical chemist ( i think), and poly-something...

the payment due for me was like $160 or something half of that was voluntary and the other half was for subjects i didn't pay a cent :D

oh yep thats what i meant hehe

hey im kinda confused with the term 'mol' is that short for moles per litre or is that number of moles? same with 'mole', and 'molar' thanks

isnt molar mass of Ba(NO3)2 = 137.3 + (14 + 48)*2 = 261.3?

hey im getting 259 u^3 as my answer, i must be doing something wrong can someone outline the steps to solve it please? thanks