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re: HSC Physics Marathon Archive It's HSC, deal with it.

re: HSC Physics Marathon Archive In reality, they are produced but in HSC, you say they are not produced.

Poor advice, the bags given don't cover your weed very well. 2/10.

re: HSC Physics Marathon Archive Physically, the correct answer is B but in HSC, if there's a slit, the correct answer is "no eddy currents are produced" and hence, the answer becomes C. Obviously, in real physics, the correct answer should be B.

re: HSC Chemistry Marathon Archive It's fine to assume that as long as you don't write it down. A better way of putting it is to assume that the salt bridge electrolyte does not react with the half cell electrolytes.

re: HSC Chemistry Marathon Archive Electrons can't be move through the water (at least, no alone), only ions are passed through water, which is why salt solutions can conduct.

re: HSC Chemistry Marathon Archive Ummm...are you being sarcastic?

The older ones are likely to be identical, or close to it.

re: HSC Chemistry Marathon Archive I don't think a question can get more pointless than this...

re: HSC Chemistry Marathon Archive You can also use the [SUP] and [SUB] things.

re: HSC Chemistry Marathon Archive For cellulose, you MUST write it as (C6H10O5)n.

re: HSC Chemistry Marathon Archive I agree with this, the other responses are sloppy. pH is a measure of [H+], to determine whether something is acidic or not, you also need to consider [OH-]. Pure water is neutral at every temperature but pH is not 7 at every temperature.

re: HSC Chemistry Marathon Archive [H+] is not proportional to pH, just look at the formula.

re: HSC Chemistry Marathon Archive Well, H+ ions don't exist in solutions, strictly speaking. What happens is that an acid donates a proton to a base, in this case, an acid, HA, donates to water, H2O to make H3O+.

re: HSC Chemistry Marathon Archive You might want to check your definitions.

re: HSC Chemistry Marathon Archive Ummm, no.

re: HSC Chemistry Marathon Archive My response would be like this, I provided a general equation for clarity: The conjugate base is what is formed when an acid donates a proton. HA (acid) --> H+ (proton) + A- (conjugate base) In your answers, the idea is definitely there but the wording is...

re: HSC Chemistry Marathon Archive That would probably get 0 since it's pretty ambiguous. Which resultant molecule? The one that gained or the one that lost the proton.

re: HSC Chemistry Marathon Archive The problem is more to do with the ions reacting causing precipitation. If that's happening, the ions may no longer available in solution, and without enough ions in solution, you have no battery. When the salt bridge ions are used up, you get no...

Go for what's cheaper as long as it offers what you are looking for.