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On second thought, the answer could be taking it from the same site, if we assume that the only purpose of the experiment is to measure contamination of lead ions on one pond. The only reason why I went with my reasoning is because of the word 'contamination site', meaning that the purpose of...

Or I could also be completely wrong as well.

Yeah but if we continue to take results from one pond, we cannot make a reliable judgment about the contamination site. Hence greater variety results must be taken into consideration in order to properly determine the effects of the contamination site. Remember, the aim of the experiment isn't...

I said this as well. My teacher told me the same thing, because the aim of experiment is to measure the concentration of lead ions from the contamination site. Measuring from different ponds increase the reliability of your experiment, as well as measuring at different depths and different times...

I talked about direct measurements from ozonesonades attached to hot air balloons or high flying aircrafts, which measure the ozone concentration directly. I did this because the results given in the table were in Dobson Units and the ozonesonades measure in Dobson units directly.

I put A. Reasoning, the sample was next to a farm and a town. So turbidity and BOD from fertiliser run off from the farm, and sewage from the town. Also the sample was right next to an ocean, so it had high levels of TDS.

What initially threw me off was the change in volume. Because im used to having everything in terms of molL-1 and working with that, but a change in volume kinda messed everything up as I didnt know whether I should divide the change in moles by the new volume or old volume, and whether the...

I personally thought this years exam was harder than last years, so hopefully marking isnt too harsh

Yes I got this as well. I justified it by saying that k constant only changes due to a change in temperature only, and I tried substituting initial concentrations and it was 10.6. I of course did working out for calculating the concentrations after it reached equilibrium due to the change in...

re: HSC Chemistry Marathon Archive Also can someone please re-iterate the rules about sig figs? If the data gives 0.001molL-1, does that mean it has 1 sig fig?

re: HSC Chemistry Marathon Archive This exact question popped up in my trials. Where did you get it from?

For TDS, I guess you can say to reduce the industrial and mining activity around large bodies of water. Other than that, there is nothing else that can reduce TDS as it is naturally occurring most of the time, however bodies of water near industries and mines tend to have a greater amount of TDS...

Under exam conditions I initially thought I was wrong, so I tried simplifying it as much as possible and eventually just ended up with saying (q-1)! / q^(q-1) as my final result, and so seeing that most solutions just kept it as q! / q^q, I got worried that my 'simplified' form may not be...

Is it ok to simplify it further and say (q-1)! / q^(q-1) ?

re: HSC Chemistry Marathon Archive There is no acid to it lol. It has a COO- functional group, not a COOH functional group

re: HSC Chemistry Marathon Archive Also to add to the criteria: -Must be a solid -If it can be obtained in pure form.

re: HSC Chemistry Marathon Archive No, carboxylic acid is not formed in saponification. Instead 'salts' or 'soap molecules' are formed.

What are your predictions for the raw cut off marks for a E3, E4 and a state rank?

Agreed