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November 01, 2025, 11:34:48 am
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Author Topic: Chemistry 3/4 2013 Thread  (Read 448755 times)  Share 

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Mr Keshy

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Re: Chemistry 3/4 2013 Thread
« Reply #450 on: February 12, 2013, 11:01:32 pm »
0
I DONT EVEN KNOW WHAT IS GOING ON
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Daenerys Targaryen

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Re: Chemistry 3/4 2013 Thread
« Reply #451 on: February 13, 2013, 04:05:49 pm »
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Not chem thats for sure
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teletubbies_95

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Re: Chemistry 3/4 2013 Thread
« Reply #452 on: February 13, 2013, 05:51:23 pm »
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So , for GC, the gaseous sample injected into the sample, there can be one of three conditions :
A) condense in stationary phase
B) dissolving in liquid on the surface of stationary phase
C) remains in gas phase

I know that. A) can occur due to high molar mass of sample . But I don't understand why b) and c) occur?


Thanks in advance !! :)
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Daenerys Targaryen

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Re: Chemistry 3/4 2013 Thread
« Reply #453 on: February 13, 2013, 06:11:10 pm »
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Whats 'GC'?
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Mr Keshy

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Re: Chemistry 3/4 2013 Thread
« Reply #454 on: February 13, 2013, 06:12:09 pm »
+1
Gaseous Compound


Surely that was a good guess :P

I don't know actually.
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Re: Chemistry 3/4 2013 Thread
« Reply #455 on: February 13, 2013, 06:14:01 pm »
+2
At first I read it as Gold Coast, until I realised its a chemistry question...
I don't believe I've learnt anything like this before... What topic is it?
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Re: Chemistry 3/4 2013 Thread
« Reply #456 on: February 13, 2013, 06:14:24 pm »
+1
Gas Chromatography?
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Highacheiver

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Re: Chemistry 3/4 2013 Thread
« Reply #457 on: February 13, 2013, 06:15:15 pm »
+1
Chromatography??!
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teletubbies_95

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Re: Chemistry 3/4 2013 Thread
« Reply #458 on: February 13, 2013, 06:16:41 pm »
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Gas chromatography! Sorry , the book used abbreviated form so i used it too! Sorry!
« Last Edit: February 13, 2013, 06:20:03 pm by teletubbies_95 »
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Re: Chemistry 3/4 2013 Thread
« Reply #459 on: February 13, 2013, 06:36:57 pm »
+1
Quote from: teletubbies_95 on February 13, 2013, 05:51:23 pm
So , for GC, the gaseous sample injected into the sample, there can be one of three conditions :
A) condense in stationary phase
B) dissolving in liquid on the surface of stationary phase
C) remains in gas phase

I know that. A) can occur due to high molar mass of sample . But I don't understand why b) and c) occur?


Thanks in advance !! :)

I'm guessing that a gaseous sample will dissolve if it is highly soluble in the liquid on the surface of the stationary phase. If the sample is not highly soluble in the liquid on the surface of the stationary phase, then it remains a gas.
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teletubbies_95

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Re: Chemistry 3/4 2013 Thread
« Reply #460 on: February 14, 2013, 02:41:24 pm »
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Thank you very much ! :)
Another question: Is there a reason why pencil is used when drawing the origin line, for example in TLC(Thin Layer Chromatography) , instead of using pen?

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Mr Keshy

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Re: Chemistry 3/4 2013 Thread
« Reply #461 on: February 14, 2013, 02:49:25 pm »
+1
From what I've seen, apparently because there are many different substances in the ink, you'll find several bands of different colours. Pencil apparently isn't affected by this.

I'm not entirely certain though :)
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thushan

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Re: Chemistry 3/4 2013 Thread
« Reply #462 on: February 14, 2013, 02:54:50 pm »
+1
Quote from: teletubbies_95 on February 14, 2013, 02:41:24 pm
Thank you very much ! :)
Another question: Is there a reason why pencil is used when drawing the origin line, for example in TLC(Thin Layer Chromatography) , instead of using pen?

Pen would dissolve in the solvent, pencil doesn't; the pen ink would move up the plate as a chemical.
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Mr Keshy

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Re: Chemistry 3/4 2013 Thread
« Reply #463 on: February 14, 2013, 02:56:54 pm »
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Heavily inclined to delete my post hahaha
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Re: Chemistry 3/4 2013 Thread
« Reply #464 on: February 14, 2013, 03:10:29 pm »
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Quote from: Machan on February 14, 2013, 02:56:54 pm
Heavily inclined to delete my post hahaha

Dude you were practically right!
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