Cssa chemistry 2012 (3 Viewers)

[madharris]

Relatively easy paper, how'd everyone else find it. I got stumped by the 3rd multiple choice lol.

which one was question 3?

I think I went pretty, well. Not too hard, not too easy

 

[Kimyia]

which one was question 3?

I think I went pretty, well. Not too hard, not too easy

i got stuck on q20 of the multiple choice...at least i think it was q20 :\

 

[vinhkn]

the one with the nickel and cadmium battery question

 

[tickleyouemo]

Please tell me someone got B for that?
.. idk i just guessed it :/

 

[Kimyia]

Please tell me someone got B for that?
.. idk i just guessed it :/

I think I put D for the ni/cad one...dont really remember lol

 

[zeebobDD]

what were the long responses guys?

 

[timeslowsdown]

I found it pretty good. The long response for shipwrecks was hard though. But overall I feel good

 

[timeslowsdown]

I think I put D for the ni/cad one...dont really remember lol

Yeah same I vaguely remember it being D

 

[Sindivyn]

Yeah same I vaguely remember it being D

Same, that was the oxidation state one yeah?

 

[tickleyouemo]

I found it pretty good. The long response for shipwrecks was hard though. But overall I feel good

I found shipwrecks bad too. m/c and that screwed me up pretty bad :/

 

[George121]

I really enjoyed my day off today haha

How'd everyone go?

 

[blieu]

i just naturally suck at chemistry so :/

 

[jeffwu95]

Found the exam pretty easy, except for the sodium iodide one.

 

[madharris]

I found it pretty good. The long response for shipwrecks was hard though. But overall I feel good

I think i rambled on about nothing for that question (I'm not good at shipwrecks)

 

[TheBloop]

Relatively easy paper, how'd everyone else find it. I got stumped by the 3rd multiple choice lol.

what was it?

i got stuck on q20 of the multiple choice...at least i think it was q20 :\

what was the question?

 

[jeffwu95]

IT was about the greatest change in pH when diluted, HCl was added, NaoH was added and sodium carbonate was added

 

[Alkanes]

Found the exam pretty easy, except for the sodium iodide one.

Didn't the question change to sodium fluoride?

 

[TheBloop]

IT was about the greatest change in pH when diluted, HCl was added, NaoH was added and sodium carbonate was added

Well HCl and NaOH would neutralise each other at the same conc and added Na₂CO₃ would make it basic, because CO₃^-2 is the conjugate base of HCO₃^-1 which is a weak acid, it is strongly basic.
And Na is the conjugate acid of NaOH which is strongly basic, so Na is a weak acid.

Hope that helps :/

 

[bubblyxblues]

IT was about the greatest change in pH when diluted, HCl was added, NaoH was added and sodium carbonate was added

I remember that question,
It said something about which one would cause the greatest pH change if one of the following was added to HCl
I was tossing between diluting it with water and adding NaOH ...

 

[jeffwu95]

i calculated it and i got NaOH