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November 01, 2025, 11:57:20 am
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Author Topic: STAV 2010  (Read 8556 times)  Share 

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kyzoo

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Re: STAV 2010
« Reply #30 on: May 30, 2010, 07:41:03 pm »
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Lololol stonecold you're right, and i took marks off myself for those things >.<
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cipherpol

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Re: STAV 2010
« Reply #31 on: May 30, 2010, 07:46:31 pm »
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btw, for this question, why can't the answer be D?
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stonecold

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Re: STAV 2010
« Reply #32 on: May 30, 2010, 07:49:05 pm »
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D is a tertiary alkanol, which means it can't be oxidised into a carboxilic acid.  Aldehyde groups can though, provided that they are the end carbon.

Don't worry, I stuffed up the same question :(

I should have realised that it looked too simple, and our teacher was telling it to us in class last week.
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cipherpol

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Re: STAV 2010
« Reply #33 on: May 30, 2010, 07:52:31 pm »
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learnt something new then :)
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cameron_15

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Re: STAV 2010
« Reply #34 on: May 30, 2010, 07:54:32 pm »
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Quote from: stonecold on May 30, 2010, 07:39:32 pm
Well in that case, and considering wikipedia never lies (http://en.wikipedia.org/wiki/Disulfide_bond), then I got 94%. :)

God I hope I can pull something like this on the exam...

I guess what they were asking was that you don't simply say covalent bonds. Rather you said specifically that it was disulfide, hydrogen etc. It's only a little ambiguous...
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stonecold

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Re: STAV 2010
« Reply #35 on: May 30, 2010, 07:57:04 pm »
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yeah, but the disulfide bond isn't even present until you draw it in the next question.

do these tools expect us to work backwards on the paper...
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Blakhitman

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Re: STAV 2010
« Reply #36 on: May 30, 2010, 08:00:52 pm »
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lmao I just did this paper.

If only I'm not retard enough to realise we use limited reagent in calculations...I would have gotten a decent score ><.
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superflya

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Re: STAV 2010
« Reply #37 on: May 30, 2010, 08:18:35 pm »
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just did this paper. nearly stumped by the first short answer -.-
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stonecold

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Re: STAV 2010
« Reply #38 on: May 30, 2010, 08:32:52 pm »
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If you mean their solution, then yeah.  They calculated stuff in the wrong order and calculated stuff that didn't need to be there and just over complicated it.  Probably one of the worst exams I have seen as far as solutions goes...
« Last Edit: May 30, 2010, 08:43:44 pm by stonecold »
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Blakhitman

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Re: STAV 2010
« Reply #39 on: May 30, 2010, 09:03:26 pm »
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Quote from: superflya on May 30, 2010, 08:18:35 pm
just did this paper. nearly stumped by the first short answer -.-

lol same, then realised it was piss easy.
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iffets12345

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Re: STAV 2010
« Reply #40 on: May 31, 2010, 08:11:52 pm »
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The percentage is 98.2, off the top of my head for the percentage yield. My teacher made a fuss about it.
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m@tty

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Re: STAV 2010
« Reply #41 on: May 31, 2010, 08:27:14 pm »
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Just did this exam in class today. We did it as a proper practice exam.. Teacher should've chosen a better exam, this one has so many weird questions, and the solutions ! some are just plain wrong...

I think I lost at least 6-7 marks >.<

Quote from: iffets12345 on May 31, 2010, 08:11:52 pm
The percentage is 98.2, off the top of my head for the percentage yield. My teacher made a fuss about it.

Yep, it was something like that. I saw their solutions, and >100 ?? What! haha, they fail...
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azn_dj

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Re: STAV 2010
« Reply #42 on: May 31, 2010, 10:15:31 pm »
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Quote
Aldehyde groups can though, provided that they are the end carbon.
Um.... arent aldehydes ALWAYS on the end carbon? Else its a ketone?

Question 3 - on the Multi choice, the answer says 5 (which is option b), but I think it should be 6 (which is option c)
Hexane
2-methylPentane
3-methylPentane
2-ethylButane
2,2-Dimethyl butane
2,3-Dimethyl Butane

Did anybody else get six instead of five?

And question 5 - I am going to be picky.....
three peaks from CH3. four peaks from CH2.
There is your answer seven.
BUT..... doesn't TMS produce a peak? Hence the answer is eight????
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m@tty

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Re: STAV 2010
« Reply #43 on: May 31, 2010, 10:23:42 pm »
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2-ethlybutane is the same as 3-methlypentane.

Yes, aldehydes must be on the terminal carbon.

And with question 5... They didn't say they ran TMS at the same time...
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azn_dj

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Re: STAV 2010
« Reply #44 on: May 31, 2010, 10:26:27 pm »
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Quote
2-ethlybutane is the same as 3-methlypentane.
shit!!!!!!! you are right. Damnit!
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