Comments on: O Level Chemistry Question – Separation / Gases http://www.simplechemconcepts.com/chemistry-questions-separation-gases/ Chemistry Made Easy Wed, 10 Mar 2010 03:57:59 -0600 http://wordpress.org/?v=2.8.4 hourly 1 By: Anonymous http://www.simplechemconcepts.com/chemistry-questions-separation-gases/comment-page-1/#comment-159 Anonymous Tue, 23 Oct 2007 03:29:00 +0000 http://simplechemconcepts.com/2007/10/15/chemistry-questions-separation-gases/#comment-159 It is nitrogen because nitrogen made up 79% of the gas in our atmosphere ^^ It is nitrogen because nitrogen made up 79% of the gas in our atmosphere ^^

]]> By: lijun(: http://www.simplechemconcepts.com/chemistry-questions-separation-gases/comment-page-1/#comment-158 lijun(: Sun, 21 Oct 2007 09:34:00 +0000 http://simplechemconcepts.com/2007/10/15/chemistry-questions-separation-gases/#comment-158 omg. i put 98%. i must be mad. omg. i put 98%. i must be mad.

]]> By: Sean Chua http://www.simplechemconcepts.com/chemistry-questions-separation-gases/comment-page-1/#comment-152 Sean Chua Fri, 19 Oct 2007 23:55:00 +0000 http://simplechemconcepts.com/2007/10/15/chemistry-questions-separation-gases/#comment-152 Dear Students,<br/><br/>Good to see you thinking and participating.<br/><br/>Answer for this question is C) Nitrogen Gas.<br/><br/>N2 is makes up the majority of the air that we breathe and they are indeed liquefied and separated by fractional distillation.<br/><br/>Two things i would need to clarify thou:<br/><br/>1) N2 makes up 78-79% of the air that surrounds us, nothing less and nothing more<br/>2)For fractional distillation of air, the components are separated based on their boiling point and not their molecular mass. When we compare molecular mass in order to find the answer, the substances must be from same "homologous series".<br/><br/>Hope this helps.<br/><br/>Sean<br/>SimpleChemConcepts<br/>"Learning Experience with A Difference" Dear Students,

Good to see you thinking and participating.

Answer for this question is C) Nitrogen Gas.

N2 is makes up the majority of the air that we breathe and they are indeed liquefied and separated by fractional distillation.

Two things i would need to clarify thou:

1) N2 makes up 78-79% of the air that surrounds us, nothing less and nothing more
2)For fractional distillation of air, the components are separated based on their boiling point and not their molecular mass. When we compare molecular mass in order to find the answer, the substances must be from same “homologous series”.

Hope this helps.

Sean
SimpleChemConcepts
“Learning Experience with A Difference”

]]> By: Spirit-Breaker http://www.simplechemconcepts.com/chemistry-questions-separation-gases/comment-page-1/#comment-148 Spirit-Breaker Thu, 18 Oct 2007 21:13:00 +0000 http://simplechemconcepts.com/2007/10/15/chemistry-questions-separation-gases/#comment-148 A: Chlorine. I think is it because of the higher molecular mass? A: Chlorine. I think is it because of the higher molecular mass?

]]> By: pf http://www.simplechemconcepts.com/chemistry-questions-separation-gases/comment-page-1/#comment-144 pf Thu, 18 Oct 2007 03:16:00 +0000 http://simplechemconcepts.com/2007/10/15/chemistry-questions-separation-gases/#comment-144 i think is C) nitrogen <br/>as nitrogen makes up 78% of the composition of air. <br/><br/>am i right? i think is C) nitrogen
as nitrogen makes up 78% of the composition of air.

am i right?

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