O Level Chemistry Question – Separation / Gases

15 Oct

Posted by: sean in: Chemistry Notes & Tips

More questions sent in to be discussed by students:

Question:
Which gas is produced in large quantities by fractional distillation?
A. chlorine
B. ammonia
C. nitrogen
D. methane

Last question for the night. Come on..Students taking your Chemistry Paper 2 on next Wednesday. Time for you to answer this question.

Rgds,
Sean
SimpleChemConcepts
Learnig Experience with A Difference

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11 Responses

Anonymous
16|Oct|2007 1

is the answer C, nitrogen?

Reply
LinwooD
16|Oct|2007 2

nitrogen..

Reply
illuminate-x
16|Oct|2007 3

I think it should be C – nitrogen gas is produced on a large scale for the production of ammonia (the Haber process).

Reply
Anonymous
17|Oct|2007 4

Yup, nitrogen.
Nitrogen is obtained by liquefaction of air and then fractional distillation.

Reply
lijun(:
17|Oct|2007 5

nitrogen.
there’s 98% of N2 in the air.

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Anonymous
17|Oct|2007 6

i think it’s methane, since it has the smallest molecular mass.

Reply
pf
18|Oct|2007 7

i think is C) nitrogen
as nitrogen makes up 78% of the composition of air.

am i right?

Reply
Spirit-Breaker
18|Oct|2007 8

A: Chlorine. I think is it because of the higher molecular mass?

Reply
Sean Chua
19|Oct|2007 9

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”

Reply
lijun(:
21|Oct|2007 10

omg. i put 98%. i must be mad.

Reply
Anonymous
23|Oct|2007 11

It is nitrogen because nitrogen made up 79% of the gas in our atmosphere ^^

Reply