Search results

but my friend, the product, water, is a (in fact, the biggest) green house gas. It will be true to say however, that on the green house gas emitted per energy generated scale, fuel cell is much more greenhouse friendly, as the conversion between chemical potential energy to electrical energy is...

pressure: if one side of the reaction involve a gas, then higher pressure would disfavor that side (eg, recharge of car battery, where H2 are evolved... you won't want the pressure to be high, in addition to the safety reasons) as regard to voltage, it depends.... if reactant involve a...

alot of hydroxides are white in colour... adding OH- is rather inconclusive... permangenate is a much more affirming test. hmmm interersting point about purssian blue.... and theoretically it should work...

exactly the same.... with only 2 exceptions: 1) you will get a negative number (meaning it requires input of voltage) and 2) you need slightly higher voltage ( reason why has not been found yet, but apparently has something to do with entropy of gases etc).

i couldn't agree more... /bow to survivor

CaCO3 is not amphiprotic. Also CaCO3 is not soluable in water (lots of CO3 2- are not) concur with NaHCO3 is better part.

hmmm I-131 is a beta emitter, and is used to threat thyroid cancer (IIRC)

if the expmt is conducted correctly and observations are valid, then you could argue that 1/2 tsp of bicarb will result in a smaller conc of bicarb in soln, hence resulting in a slower reaction rate. though to ensure the properness of the expmt, you should use 10mL vinegar in 90 mL of water...

1) ohhh heaps of stuff you could talk about.... what's the product of reduction of oxygen? also, platinum complexes are known cytotoxins (yes, what i'm dealing with now), is it really safe to have platinum metal in your body? (it's a question, not a rhetorical one) 2) ie we have K+ and Cl-...

coordinate covalent bond is a very obscure idea... and your friend is absolutely right, the other bond alternates between the two oxygen atoms.

@jonni: correct, though I refer F = GMm/r^2 since g= gravitational acceleration usually.

Re: 回复: Some P.O.D HELP!!! @macca: industrially, using glucose is expensive and less economically viable. which is why they use molasses, which contains mostly sucrose. as an industrial waste of producing white sugar (glucose), molasses is much viable as a starting material for fermentation.

errr... yes? you sure this is in the hsc? in the option maybe?

heat in this case does 2 things: a) increase rate of reaction (as it does to all reactions in the world) b) increases yield (IIRC, since esterification is an endothermic reaction) but reagents are volatile, as f3nr15 said. so you attach a condenser to condense all evaporated reagents.

Not really... the question says aqueous soln... say you have Al(NO3)3 aq so in your "solution", except Al3+, NO3 -, what else do you have? what else might preferentially reduce?

1) uses molasses -> dimer of glucose -> industrial waste from production of sugar -> saves cost 2) "discovery of element" implies the element which has not been there before. ie, look on your periodic table, how many gaps have been filled since your periodic table has been printed?

one thing to add: titration of EDTA using enriochrome black-T as an indicator. turning point is when purple turns blue (IIRC) now something which you don't know for the HSC: ozone infact exist in a resonance structure. so whilst the picture depicts ozone having 1 double bond and 1 single...

re: [H+][OH-] = 10^-7 you mean 10^-14? pH should be: 13.50 (you have NaOH in water... the pH shouldn't be less than 7) 2) concur about the salt part. the self ionisation of water, which produces H+ and OH- has very negligible effect on conductivity however. Therefore, in titration of...

nah, 600 nm = 600x 10^-9 = 6.00 x 10^-7 it's silly though... question asks 2 watt, but in answer i used 1 watt :$

to avoid things from ppt'ing