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Pip Well that REALLY pisses me off, i put so much effort into that and we dont even get a mark for it! let me know if u find out how to get it. Thanks

But % w/v is used for many solutions that contain a dissolved solid in a solution. Im not too sure now, cos i thought about that in the exam but now i am a bit confused

Pip Hey does anyone know whether we get a mark for the PIP and when we get it?

w/v? why cant you put in w/v? w/v is a % isnt it. I thought it was like g/100ml or something and u can put the answer in (example) 4 % w/v which is 4g/100ml

It was 2 marks and u had to put the conc in % w/v

"It is suspected that lead has contaminated the creek. Describe a CHEMICAL test that could be carried out on the water sample to determine the presence of lead" (2marks) I assume that AAS is not really a chemical test. I'm not sure really.

hah i dont think the chemistry teachers know the meaning of leniency!! from what my teacher tells me they are pretty harsh, i think chem is marked the hardest

Pb2+ Yes well they are two separate tests but you need to have both of them to confirm it. More like a two step process rather than two steps. Cos i think adding HCl to other cations forms a white ppt as well so u have to make sure it is lead. Trust me, my teacher made sure we...

yes they did ask for a balanced equation

haber proccess It was 2 marks for the graph and 2 marks for the explanation, so maybe if u show that it goes up and ammonia increases and the N2 and H2 decrease then maybe u might get 2 marks, but then again maybe u would need to est equilibrium as well ... and explain it

Iron and Mg in beaker I am soooo comfused.... I remember writing an experiment using Mg as asacrificail anode and i vaguely recall that my teacher said that they must be touching. They are not touching in the diagram. but then again it is an electrolyte solution so who knows... btw it's...

Tests for cations and anions Yeh i hated having to remember tests for cations and anions. My teacher is a HSC marker for like 20 yrs or something and they are very specific about those. You have to have an initial test and a confirming test. You have to have the amounts and maybe the...

im not too sure about that because When CaCo3 reacts with acid, H2 gas evolves. But they might accept it cos it's balanced and H20 + CO2 --> H2CO3

haber process no I forgot to ask about thatbut i hope we dont have to show that the reaction reaches equilibrium again, but knowing how the HSC markers mark chem i bet it will be needed. They are so picky

reliability and diprotic Because H2SO4 is diprotic then there is double the [H+] concentration. So it is -log0.2 which is around 0.69, but because the second ionisation thing is weaker, it is tachnically around 0.9, so it is still less than one. so A Reliability is improved by repeating...

haber process i spoke to my chemistry teacher and she said that the concentration of everything had to go up a little bit in a straight line to indicate that the volume of the vessel had changed. (less volume --> higher concentration) Then you have to show what happens with increased pressre...

Spartan society Agamemnon was the king of Mycenae, not Sparta Sparta's king was Menelaus and the Trojan War may not be accepted because it might not have happened, Homer made up that stuff if i recall. Like i think Sparta didnt even exist at the time of the Trojan War cos Homer wrote it...

Spartan society Agamemnon was the king of Mycenae, not Sparta Sparta's king was Menelaus