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How was it?

YIC

Posted 31 May 2005 - 06:04 PM

My goodness, posts are just flooding in.

YIC

Posted 31 May 2005 - 06:04 PM

QUOTE(e-unit @ May 31 2005, 07:03 PM)
QUOTE(YIC @ May 31 2005, 07:03 PM)
For that question with the mask and why the CO2 would disappear, what did people put? I spoke some garbage about the CO2 dissolving in water vapour to produce carbonic acid which would neutralise the potassium hydroxide. Even though nothing was in solution I said that the water vapour would consense.

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KOH was produced which absorbs CO2

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Oh damn, I never noticed that!

sai

Posted 31 May 2005 - 06:07 PM

oh well got that one wrong too



e-unit

Posted 31 May 2005 - 06:08 PM

Just Googled:
"Thus, Copper metal, Cu, will not react with dilute Sulphuric Acid, H2SO4, or with Hydrochloride Acid, HCl, but it reacts with Nitric Acid, HNO3"

tupacshakur

Posted 31 May 2005 - 06:09 PM

QUOTE(e-unit @ May 31 2005, 06:08 PM)
Just Googled:
"Thus, Copper metal, Cu, will not react with dilute Sulphuric Acid, H2SO4, or with Hydrochloride Acid, HCl, but it reacts with Nitric Acid, HNO3"

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ur point being?

tupacshakur

Posted 31 May 2005 - 06:10 PM

Soph.E. @ May 31 2005, 05:22 PM)
- I said both hydrogen and carbon dioxide would be left at the end because:

metal + acid = salt + hydrogen gas
metal carbonate + acid = salt + water + carbon dioxide gas

and there was a metal and a metal carbonate reacting with the acid. (Think I'm remembering this right!) Standard grade stuff though really isn't it... always catches you out huh.gif
*

bred

Posted 31 May 2005 - 06:27 PM

Does anyone have a copy of the paper then so we can try and get some unofficial answers up?

coolncleo

Posted 31 May 2005 - 06:28 PM

U know after readin all these answers i kinda dont think i done that well ohmy.gif

tupacshakur

Posted 31 May 2005 - 06:29 PM

what was the answer to the question

what was the alcohol used in the polymerisation (or something like that in paper 2)

i wrote ethanol

bred

Posted 31 May 2005 - 06:30 PM

Yeah, I wrote that as well and I'm pretty sure my teacher said that it was correct. smile.gif

dfx

Posted 31 May 2005 - 06:30 PM

It was methanol in the hydrolysis? of poly (ethyl ethanoate) , but anyway, it was methanol. Pretty sure.

bred

Posted 31 May 2005 - 06:32 PM

QUOTE(dfx @ May 31 2005, 07:30 PM)
It was methanol in the hydrolysis? of  poly (ethyl ethanoate) , but anyway, it was methanol. Pretty sure.

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I don't think I wrote methanol as an answer to any of the questions. :/ Did you not get ethanol as an answer to any of them? For the question I'm thinking of there were 2 carbon atoms.

Tiger

Posted 31 May 2005 - 06:32 PM

QUOTE(bred @ May 31 2005, 07:30 PM)
Yeah, I wrote that as well and I'm pretty sure my teacher said that it was correct. smile.gif

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me to biggrin.gif

dfx

Posted 31 May 2005 - 06:33 PM

Oh man I'm outnumbered sad.gif

Tiger

Posted 31 May 2005 - 06:34 PM

QUOTE(coolncleo @ May 31 2005, 07:28 PM)
U know after readin all these answers i kinda dont think i done that well  ohmy.gif

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Iam the opposite. I actually feel better. It lookz like i actually got some right. biggrin.gif

bred

Posted 31 May 2005 - 06:36 PM

From reading what other people have been saying, I think I did about as well as I thought I had when I left the exam hall...I think that means a B grade...

dfx

Posted 31 May 2005 - 06:37 PM

You know how I think it was methanol?

Well I don't know if you recall the question, but methanol is CH3OH, the OH bit stuck to the to the original polymer chain on the side bits, and the CH3 bit reacted with whatever was stuck at the side bits of the chain. Thats why.

gary

Posted 31 May 2005 - 06:47 PM

I wrote ethanol.

scotland_2004

Posted 31 May 2005 - 06:59 PM

For the question asking to work out the mass of Vitamin C in a tablet, for the number of moles of iodine i think i did it wrong and did the concentration x volume of 0.05 instead of 0. 263 (cant remember exact value) and ended up getting an answer of 0.44g. Would that be one mark considering the method was right?

bred

Posted 31 May 2005 - 07:08 PM

QUOTE(scotland_2004 @ May 31 2005, 07:59 PM)
For the question asking to work out the mass of Vitamin C in a tablet, for the number of moles of iodine i think i did it wrong and did the concentration x volume of 0.05 instead of 0. 263 (cant remember exact value) and ended up getting an answer of 0.44g. Would that be one mark considering the method was right?

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What was the correct answer to this question? I think I got an answer of a little under 1g. :/

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