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Oh... does E4 still correspond to 90-100 % ?

i also do quanta and what you are saying sounds correct. but you are looking too much into the question. for each sample in AAS you use a lamp which emits light of a wavelength known to be absorbed by the element you are testing for.. since you do Q2Q you should know that the wavelength...

Does any one have any idea what the approximate raw mark cut off is for a band 6 in extension 2 (4 unit) mathematics?

but surely you can do a flame test under a fume hood? theres no reason why you cant?

yeah i said the same for flame tests... flame tests could distinguish the solutions... but i dont think a flame test can be used to identify a solution of sodium carbonate as it would give the same colour as sodium chloride

im pretty sure it was what volume of 0.005 mol/L KOH solution is needed to neutralise a sulfuric acid solution which was originally 0.005 mol/L solution, but had been diluted by a factor of 10 (pH increase by 1) thats basically it

i wish i had actually performed a first-hand investigation that modelled an equilibrium... ive never performed such an investigation. all i had was the beads model from surfing chemistry. but i foolishly skipped over that page thinking it was simply to help people understand what an equilibrium...

Do all of the option topics scale the same? Is it designed so that they are all equally hard? Or are the option topics (section II) marks compared with the section I marks to calculate scaling for each option topic. For example, Two people get 90% in Section I. One student does Industrial...

Do all of the option topics scale the same? Is it designed so that they are all equally hard? Or are the option topics (section II) marks compared with the section I marks to calculate scaling for each option topic. For example, Two people get 90% in Section I. One student does Industrial...

The temperature didnt affect calculations at all. We were given the concentrations, and simply used those as we usually would to calculate the equilibrium constant, K. I think 373K was put there to test whether people understood the theory and see if anyone was fooled.

i just disagree with part ii of the question... i see absolutely no risk (at least one thats worth a worth) with using a model. I think this part of the question through a lot of people off.

Did anyone else write an experiment instead of a model??? Do you think I will get 0/6 because i wrote an experiment? I used the thiocyanate test for iron (III)

yep i missed that one... im pretty sure the correct answers are: 1A 2D 3B 4C 5D 6C 7D 8C 9A 10C 11B 12A 13A 14D 15B

Yeah the two measurements are equivalent

you got 10/15 3B 8C 9A 10C 13A

i agree... i carefully noticed that the question said IDENTIFY these compounds... not DISTINGUISH them... if you use a flame test on a solution of sodium carbonate, you can deduce that it contains sodium, but not carbonate.

i was very confused... i assumed it meant model not experiment... BUT, what risks are involved with a model?

we already considered it being diprotic. it is 3mL

it is also required to initiate the reaction as it removes hydrogen from the carboxylic acid and hydroxy group from the alcohol

theres no such thing as "concentration" for a solid so therefore you dont include it