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November 01, 2025, 12:38:36 pm
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Author Topic: TSFX 09  (Read 966 times)  Share 

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Martoman

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TSFX 09
« on: June 03, 2010, 11:45:54 pm »
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Ok guys just did this paper got 87% for it. Wondering if this is good/bad as I've heard TSFX isn't that good but I found this paper to be quite interesting (albeit, with some FAIL solutions at some points).


edit: serine at pH 9 the alcohol in the Z group doesn't act as an acid?

 - If an equivalence point is below 7 and i use phenolphalien as an indicator (starting with a basic solution) wouldn't the end point show BEFORE the equivalence point? Thus we would be using LESS and thus a lower percentage (of a hypothetical acid-base reaction) in the end?
« Last Edit: June 03, 2010, 11:52:59 pm by Martoman »
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olly_s15

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Re: TSFX 09
« Reply #1 on: June 03, 2010, 11:48:41 pm »
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Quote from: Martoman on June 03, 2010, 11:45:54 pm
Ok guys just did this paper got 87% for it. Wondering if this is good/bad as I've heard TSFX isn't that good but I found this paper to be quite interesting (albeit, with some FAIL solutions at some points).

In my honest opinion, tsfx exams are not indicative of VCAA exams in comparison to other commercial trial exam companies. Fairly good score though, well done. I think I completed this paper and found it somewhat strange at times. Cbf digging it up though..
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Martoman

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Re: TSFX 09
« Reply #2 on: June 03, 2010, 11:53:32 pm »
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oh i was demoralised with that :S


Whats the usual mark?
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m@tty

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Re: TSFX 09
« Reply #3 on: June 03, 2010, 11:54:35 pm »
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Quote from: Martoman on June 03, 2010, 11:45:54 pm
Ok guys just did this paper got 87% for it. Wondering if this is good/bad as I've heard TSFX isn't that good but I found this paper to be quite interesting (albeit, with some FAIL solutions at some points).

I did it and got 86% screwed up the last question, got it all wrong =\ Failed pretty hardcore...

The exam is fairly dodgy.

Quote from: Martoman on June 03, 2010, 11:45:54 pm
edit: serine at pH 9 the alcohol in the Z group doesn't act as a acid?

Alcohols 'never' act as acids (Mao said they need pH>14 before they will donate).
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Martoman

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Re: TSFX 09
« Reply #4 on: June 03, 2010, 11:57:27 pm »
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Oh he did didn't he! Yeah I was basing it off pretty bad thinking (oh in a carboxy there is a hydroxyl.................. yeah.....................).

I didn't find it overly dodgy. Just dog in some places. They also fail at oxidation numbers.
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m@tty

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Re: TSFX 09
« Reply #5 on: June 04, 2010, 12:03:47 am »
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Quote from: Martoman on June 03, 2010, 11:45:54 pm
If an equivalence point is below 7 and i use phenolphalien as an indicator (starting with a basic solution) wouldn't the end point show BEFORE the equivalence point? Thus we would be using LESS and thus a lower percentage (of a hypothetical acid-base reaction) in the end?

Yes, the end point will be premature, and yes this means a lower titre. But from that you infer that there is a higher concentration of the analyte in the conical flask, and hence to answer the question, a markedly higher percentage purity.
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Martoman

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Re: TSFX 09
« Reply #6 on: June 04, 2010, 12:12:02 am »
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If they react 1:1 then say.

Less volume means less mol. Means less mol in the other one. Means less mass.

Or am i doing chemistry at 12 in the morning and failing.  :-[
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Stroodle

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Re: TSFX 09
« Reply #7 on: June 04, 2010, 12:14:47 am »
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I just did the 2010 tsfx. Also has some pretty interesting questions in it, and some really stupid stuff too...
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Martoman

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Re: TSFX 09
« Reply #8 on: June 04, 2010, 12:17:36 am »
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Yeah i will be doing that one soon :)
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m@tty

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Re: TSFX 09
« Reply #9 on: June 04, 2010, 12:18:22 am »
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Wait, I think it is I that fails... You seem correct. Damn it, I hate getting confused. =|
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chansthename

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Re: TSFX 09
« Reply #10 on: June 04, 2010, 04:50:28 pm »
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well what are their lectures like in comparison to others, I have found them to be fine but now am rethinking it.
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Martoman

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Re: TSFX 09
« Reply #11 on: June 04, 2010, 05:12:27 pm »
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I thought it was pretty good and informative!?
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2009: Math methods: 50, Psychology: 44
2010: chem 47, further 48, Spesh 49 fml seriously and other yr 11 subs.
2011: Holidaying, screw school.
No. Not azn.
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