How did it go ? CSSA trial (1 Viewer)

[Huy]

Originally posted by Saul
i'm fairly sure they were after the 6 hour one, cause they want to see how long it takes for stuff to get through the liver. 42 min wouldn't be long enough.

I was thinking the same thing. (If anyone does physics), Cobalt-60 is another isotope used. I think it was in "Quanta to Quarks".

I chose 6 hours because it wasn't too short, but it was fair enough in my opinion.

 

[iambored]

Originally posted by Chand
CaCO3 was just calcium carbonate reacted with HCl, how much CO2 was produced. It was multiple choice, and they gave u enuf info to work out the moles of CaCO3 but they also gave u the amount of HCl, so by working out the moles of that u find out that the HCl was the limiting factor....the wine one was abt adding metabisulfate..i think..to prevent something in the wine oxidising...that was a short answer i think

serious? ggrrrr.. i doubt i did that!

 

[iambored]

Originally posted by Huy
3.5 minutes seems a bit short,

Did 3.5 mins have gamma radiation too? Or did it have alpha/beta in it somewhere?

I thought 6 hours wasn't too bad, seeing as though it would travel to the liver and can be detected externally.

A had gamma and alpga or beta
and i think B had just gamma

they had like 6/7 hrs each

 

[howareya]

yeah your right 6 hrs gamma

 

[mat]

hey guys
just 2 let use know i aced the hell uut of the exam looking towards 98- 100
im just concerned about the radioistope i put in 6 hors cause as huy said if you do physics you'll understand why. 3.5 is way 2 short ,you need way more time to be able to detect it.
anyways a sinch exam never thougt itll be that ezy just hope i get the marks
good luck 2 everyone got any queries ill try to help

 

[Huy]

Originally posted by mat
just 2 let use know i aced the hell uut of the exam looking towards 98- 100

98-100%
You're very confident there, did you get the potassium metabisulfite one as well? Could you explain the wine one please.

(I wrote that the hydronium ion concentration increases, therefore the pH will decrease corresponding to an increase in acidity )

Some other students were asking whether it was a buffer, etc (previous posts).

Thanks in advance

 

[howareya]

what did you put down for ethanol in multi choice

do you do industrial...if so what was your equilbrium answer

did you use a diagram and safety in ester

 

[SoCal]

What did everyone put for the prac question at the start of the written bit. It asked about what jar you put the stuff in or something. I cannot remember.

 

[Huy]

Electronic scale (the questioned asked for the data collection device used in the investigation. You'd measure out the weight of the flask and continually measure the flask(s) to determine the conditions under which fermentation is promoted).

It was the fermentation of glucose experiment.

 

[SoCal]

Originally posted by Huy
Electronic scale (the questioned asked for the data collection device used in the investigation. You'd measure out the weight of the flask and continually measure the flask(s) to determine the conditions under which fermentation is promoted).

It was the fermentation of glucose experiment.

I just left it. I could not even remember doing the question, so there goes seven marks already.

 

[howareya]

it is NOT a Buffer

 

[howareya]

Originally posted by Ragerunner
im pretty sure it had something to do with equilibrium equation.

btw how did you guys calculate the ethnaol question from the multiple cohice ?

sometihng about 11.5g of ethanol and 1380kj heat of combustion

no i divided by the number of moles...dont know which is right

 

[Ragerunner]

im pretty sure its not a buffer. and i think the pH actually goes higher instead of being more acidic ?

 

[Rand]

Oh My God!

I totally BSed my way through that Question about wine, but its not a buffer.
Hehe, I wrote that [H+] concentration decreases, and as a result, pH rises.

Then I made up some shit like "this is done to make the wine less acidic and safer for human consumption, because a too-acidic beverage is capable of poisoning blood, and leading to adverse efects in the body.

Im so full of hot air...

 

[underthesun]

psst, electronic weighter counted as electronic scale?

I just heard "electronic scale" today as I *ahem*skipped many experiments, and they probably used scales..

 

[iambored]

Originally posted by Huy
Electronic scale (the questioned asked for the data collection device used in the investigation. You'd measure out the weight of the flask and continually measure the flask(s) to determine the conditions under which fermentation is promoted).

It was the fermentation of glucose experiment.

yeah i put scale!
i made up crap 4 the wine one as well.. hmm..

 

[dak1983]

Sorry..every1...
im interestin about the wine Q...

could anyone recall da Question again?Wht did he ask 4?

 

[howareya]

asked you to dtermien some ions impact on the wine.

whetehr it increased the pH or not...

i put down that wine is naturaaly acidic and the pH increases to safe consumption

 

[Huy]

potassium metabisulfite

 

[howareya]

How many enviromental concerns are there for the solvay process (industrial option)

i only put down three:
* NH3 gas
* Calacium Cholride
*Overall exo. reaction --> thermal pollution