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re: HSC Chemistry Marathon Archive How'd you know :( Ok, Z>95 are produced within particle accelerators - By accelerating the nucleus of a smaller element into a heavier element to produce the Curium.

re: HSC Chemistry Marathon Archive Never head of curium, lol. Neptunium: -Uranium 238 bombarded with a neutron in a nuclear reactor to create Uranium 239 -Decays into Neptunium + beta particle

re: HSC Chemistry Marathon Archive I still remember that proof :3

re: HSC Chemistry Marathon Archive throw the questions soccerdude, i'll answer it lol :biggrin:

re: HSC Chemistry Marathon Archive Sweet, thanks for clearing that up

re: HSC Chemistry Marathon Archive a 0? ok, could you explain the marking criteria that you used to critique my answer and perhaps add a response? I'm an esl student and only recently came to Aus (2011), so yeah i'm not sure how to explain very well, haha. niggas be telling me to improve my skills

re: HSC Chemistry Marathon Archive B-L stated: when an acid donates a proton, the resultant molecule is known as the conj. base e.g. HCl --> H+ Cl- (Cl- is the conj. base)

re: HSC Chemistry Marathon Archive - fission of Uranium to get Mo-99 -> decays into tc-99m - neutron bombardment of the already produced mo-98 to get mo-99 -> decays again + w/e equation you choose e.g. 98Mo+1n-->99Mo

re: HSC Chemistry Marathon Archive Include 'a' chemical equation and 4 marks for theory? gg Let's start with some obvious: - can cause decrease in pH levels in water-ways (e.g. lakes), hence increasing the acidity -> causing detrimental effects on the local ecosystem (fish die) - crops and...

MIF is very well suited if you're not 'understanding' the basics.

Regret English. The struggle is real

Any engineering tutors out there? A buddy of mine looking to state rank (extremely motivated, but lack of guidance as school rank is quite low) Leave a comment below if you know or are tutoring engineering studies Cheerss

Re: HSC 2015 4U Marathon In the meantime, someone try solving this (just curious): x^5+x=1, find real x

Re: HSC 2015 4U Marathon cos4θ=Re ∑k=0->4 (4Ck)(cosθ)^k(isinθ)^(4−k)=8cos^4θ-8cos^2θ+1 let cosθ=x and then cos4θ=1/2 so, 8x^4-8x^2+1=1/2 16x^4-16x^2+1=0 solve cos4θ=1/2 therefore: +/- cospi/12, +/- cos5pi/12

Re: HSC 2015 4U Marathon calm down boy, this thread wont die as long as im here

Re: HSC 2015 4U Marathon x^2+bx+x? or x^2+bx+cx? Solve simultaneously by subbing 2,-2,3 and setting =0 ? pre-guess :lol:

Anyone have the papers/solutions to JR Term 1/2 papers from any of the years between 2001-2014? Came across some good questions that I've never seen in other school trials/HSC :O

Use product rule. Let u=cosx, v=1+sinx Find turning/inflection points (may need to differentiate twice) Slot a few key values e.g. 0, pi, 2pi if you are unsure

Guessing is some high level stuff. Beyond the MX1 course... :D

Who cares about impossible. Make it possible.