Monday, October 15, 2007

Chemistry Questions - Separation / Gases

Q)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 comments:

  1. AnonymousOctober 15, 2007 at 11:59 PM

    is the answer C, nitrogen?

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  2. Yan LinwoodOctober 16, 2007 at 1:57 AM

    nitrogen..

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  3. illuminate-xOctober 16, 2007 at 1:58 AM

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

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  4. AnonymousOctober 16, 2007 at 10:56 PM

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

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  5. lijun(:October 16, 2007 at 11:29 PM

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

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  6. AnonymousOctober 16, 2007 at 11:42 PM

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

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  7. AnonymousOctober 17, 2007 at 8:16 PM

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

    am i right?

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  8. gilbertbarcaOctober 18, 2007 at 2:13 PM

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

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  9. Sean ChuaOctober 19, 2007 at 4:55 PM

    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"

    ReplyDelete
  10. lijun(:October 21, 2007 at 2:34 AM

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

    ReplyDelete
  11. AnonymousOctober 22, 2007 at 8:29 PM

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

    ReplyDelete