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re: HSC Chemistry Marathon Archive When are ur trials? Im out of ideas and i dont want to post up those useless questions that are only require rote learning $How many isomers does C_3H_7F$ $ have?

Re: HSC 2013 3U Marathon Thread i remembered the C C: and sorry i horribly worded the question wrong sorry, i'll fix it $Look at $(1+x)^n \\ \\ $i) Write down the binomial expansion of $(1+x)^n \\ $ii) Hence show that 2^n = $\sum_{r = 0}^{n} \binom{n}{r} \\ $iv) By using part i), show that\\...

re: HSC Chemistry Marathon Archive yep nice, if u may continue this without me, my energy levels have depleted

re: HSC Chemistry Marathon Archive Question: Why does the neutralisation of any strong acid in an aqueous solution by any 1 strong base always result in a heat of reaction of approx. -57 kJ/mol (HSC question)

thanks! can u see any other mistakes/problems? so that girlworlod club can comprehend it

1st point: i used a low modailty word "maybe" to expose my uncertainty 2nd point: why isnt suspended solids in a solution? this causes the cloudiness of some waters. Say i took a sample of highly turbid water, this solution would have to contain suspended solids

TDS = total dissolved solids = mass of solids that are dissolved in the water Turbidity = in water, it means cloudness or LACK OF transparency as a result of suspended solids DIFFERENCE: TDS does not include SUSPENDED SOLIDS, it only measures DISSOLVED SOLIDS TURBIDITY is just a measure of...

well then, i think u have to do the test over several days and get the turbidity of each day and graph that

how did u test for turbidity? what method/intsrument?

can u say that DELTA = 0? because there is only 1 solution for x

lol, i think all u need to remember is Pythagorean identities (eg. sin^2 A + cos^2 A = 1) complementary and supplementary angles

sin2x = 2sinxcosx is a 3 unit trigonometric identity

re: HSC Chemistry Marathon Archive this was not a question from any textbook, it was from my brain thanks for a graet explanation, i know understand AND soRRY i mislead u lachy95 lol

No

re: HSC Chemistry Marathon Archive -U need a reversible reaction -Closed system -Time

Find total degree of ionisation, minus from 100% and u get the % of acid left un-ionised

re: HSC Chemistry Marathon Archive 1) Sorry is was meant to be more marks lol, and yeh thats 1 reason (i wanna see TWO more) 2) Well done, but ur conclusion of "achieve the same yield of products in the absence of high pressure equipment", i dont think its correct, i dont think injecting gas...

Re: HSC 2013 3U Marathon Thread $Consider $(1+x)^n By differentiating and integrating it prove that: \sum_{r=1}^{n} \binom{n}{r}\frac{r}{r+1} = 2^n \frac{n-1}{n+1}

re: HSC Chemistry Marathon Archive Question: a) What is required for a particular reaction to be in a state of dynamic equilibrium? (3 mark) b) A manager of a company producing ammonia by the Haber process, has become bankrupt because, sadly a burglar stole the equipment for the Haber process...

May I ask u why u deleted the chemistry thread after i helped u? I had another method in mind (a more logical and proper one) when i woke up in the middle of the night and was gonna post it up this morning, but the thread was gone... Why did u delete it?