Option 2 - Shipwrecks, Corrosion and Conservations (1 Viewer)

[ay_caramba]

exactly what did Faraday do? coz im still clueless.
and 1/2 equation?? what did you pplz put???

* his law of electrolysis- related the quantity of product formed at the electrode to the voltage passed thru the cell- allowed electrolysis to be quantitated and costed
* related the voltage that passed thru a cell to the valency of elements
* used terms such as anion, cation and electrolyte

thats all i could think of

 

[mushroom_head]

i think i just completely screwed up this section ! stupid faraday! stupid 7 mark question! stupid shipwrecks!

 

[mathock]

I wanted there to be stuff on sulfate-reducing bacteria i studied that heaps. oh well i hated the chemical tests i didnt study them much. What did people get for the way to detect chloride ions, i hope i got that right??

add AgNO3 and get a white precipitate, then add HNO3 and the precipitate stays

 

[rumour]

yeah, but in both cells, oxidation still occurs at the anode and reduction at the cathode.

and for the oxidation, I used the:

2OH- -> 1/2O2 + H2O +2e-

added 2H+ to both sides to get:

H2O -> 1/2O2 + 2H+ + 2e-

You can not use that one!!!
btw-i think that one is only for acidic environments

Cause if you look at the table oxygen is added, so you have to find the water eqns where only water is on one side.

But if you did use this eqn with the 1/2Br2(aq) one, then the water one would be the cathode reaction.

 

[crazymaniak]

what about the pottassium? doesnt K-> K[2+] + 2e[-] in an electrolytic cell?

i went fairly average.. how does chem get scaled normally? - like if u get bout 80% will ur mark go up by much?

 

[aim54x]

i stuck in history and development, surface alloys and fibreglass 4 good measure.

 

[scruffy012]

yeah it as good, i knew both 7 markers it wasnt overall that bad, i was prepared for worse,

yay, no fertiliser question

scruffy

 

[euphoric]

* his law of electrolysis- related the quantity of product formed at the electrode to the voltage passed thru the cell- allowed electrolysis to be quantitated and costed
* related the voltage that passed thru a cell to the valency of elements
* used terms such as anion, cation and electrolyte

thats all i could think of

hmmz thankz!!
but i still dont see the impact of our understanding of electrolysis. i dont think i ever will
oh wells chem is over!!

 

[xeriphic]

what about the pottassium? doesnt K-> K[2+] + 2e[-] in an electrolytic cell?

i went fairly average.. how does chem get scaled normally? - like if u get bout 80% will ur mark go up by much?

no because K will only reduce at the cathode in this case water got in the way

 

[rumour]

what about the pottassium? doesnt K-> K[2+] + 2e[-] in an electrolytic cell?

i went fairly average.. how does chem get scaled normally? - like if u get bout 80% will ur mark go up by much?

Not in this one as the water has a higher number so it gets reduced instead.

 

[xeriphic]

yeah it as good, i knew both 7 markers it wasnt overall that bad, i was prepared for worse,

yay, no fertiliser question

scruffy

there actually one was fertilier, test for SO42- XD roflmao lucky I still remember it's Ba2+ kahahahahahahaha

 

[VVoody]

there actually one was fertilier, test for SO42- XD roflmao lucky I still remember it's Ba2+ kahahahahahahaha

Huzzah for putting Ba2+ for them all ^_^

 

[Steven12]

is it okay if you put barium nitrate instead barium ion? for reagent.

this test was tricky, hope its not the same for physics, cos i am counting on these 2 subjects

 

[mathock]

i said to use AgNO3 and no precipitate.. is that wrong??

 

[Murray]

There was a 7 mark question on the history of shipbuilding:S

Yep i did 4-5 pages on that one ... hope it was not just bullshit!

 

[VVoody]

Yep i did 4-5 pages on that one ... hope it was not just bullshit!

yea same, but i started talking about stainless steel and for some reason then went on to talk about corrosion prevention =\

hopefully i have the right answer in there somewhere lol

 

[Rowlooooooooooo]

There was a 7 mark question on the history of shipbuilding:S

I did 1 3/4 pages on that question i had heaps to crap on about.

 

[Rowlooooooooooo]

Yep i did 4-5 pages on that one ... hope it was not just bullshit!

5 pages for 7 marks, waste of time.

 

[meanbob]

for the ion testing reagent question, i had no idea.
i didnt know we needed to memorise the tests!

 

[RaineeDays]

Yeh well..im just glad its over.. it could hav been a hell of alot harder me thinks