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re: HSC Physics Marathon Archive im not 100% certain my answer is right though. Did you account for mass dilation?

re: HSC Physics Marathon Archive 3.43 x 10^12 m/s^2 towards the negative plate (upwards)

re: HSC Chemistry Marathon Archive also the question asks for biopolymerS - so talk about another biopolymer such as cellulose. Also you must state what the developments are. E.g. biopol is biocompatible (able to be used in the body without rejection) and is being used in medical sutures and...

^Are you sure its that high? They give out 20 state ranks in bio and its hard to imagine all 20 getting around 96

re: HSC Chemistry Marathon Archive ^its considered a catalyst since it lowers the activation energy in esterification and hence increases rate of reaction. However it is also a dehydrating agent and removes water from the system to drive the equilibrium to favour ester yield. But this is not...

bump

re: HSC Chemistry Marathon Archive Ethane and ethene have similar physical proeprties as they are both non-polar hydrocarbons with similar molecular mass. They have similar MP/BP, both are water insoluble and cannot conduct electricity However their chemical properties differ greatly due to...

Just out of curiosity, what would do you think is the cut-off raw mark to get a state rank in each of the science. Would it be around 92-93?

if you watch family guy, shut up meg

14 is A Esters are less polar than the corresponding alkanoic acid and alkanol. Hence the BP is <97Í 18 is c) In order to shift the equilibrium left a base must be added. By adding a base, the hydroxide ions will react with the H+ ions. As a result the conc of H+ ions decreases and the...

re: HSC Chemistry Marathon Archive lol my bad.

re: HSC Chemistry Marathon Archive It is slightly basic as it is the salt of a strong base and a weak acid. In solution the salt dissociates as NaHCO3 ---> Na+ + HCO3- The sodium cation has no tendency to hydrolyse, whereas the hydrogen carbonate ion will hydrolyse in water to produce...

re: HSC Chemistry Marathon Archive 2KOH + H2SO4 -----> K2SO4 + 2H20 n(KOH) = cV = 0.05L x 0.15 mol/L = 0.0075moles n(sulfuric acid) = 0.15L x 0.1 mol/L = 0.015moles since moles of base and acid are in stoichiometric ratio (2:1), there is no limiting reagent; i.e. all moles of the base...

re: HSC Chemistry Marathon Archive ^How would you talk about quantitative changes with the salt bridge?

If the metal has high resistance then less eddy currents will flow through it. Edi: and thus less heat being produced by resistive heating

re: HSC Chemistry Marathon Archive 1. Mass of lead anode decreases as lead oxidises to Pb2+ 2. Mass of copper cathode increases as Cu2+ reduces to Cu solid 3. The conc of lead ions in the anolyte increases 4. The conc of copper ions in the catholyte decreases (i think you can measure this using...

the GM's cancel out

orbital velocity = root (GX/r) where X is the planets mass (didnt wanna use M since question used it) For planet with radius R Orbital velocity = root (GM/R) For planet with radius 9R orbital velocity = root( GM/9R) = 1/3 root (GM/R) for planet with radius 16R orbital velocity is 1/4 root (GM/R)...

thanks, was getting worried i might have stuffed it up by not listing k=0,1,2...

Exclusion: E.g grey mangroves have an ultrafiltration system in their roots to actively exclude Na+ uptake Accumulation: Salt ions are actively transported away from sensitive cells and to specialised salt glands where they accumulate to reduce toxic effects on plant tissue. these are shed or...