November 27, 2024, 08:05:17 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Nature of bonding in CO & CO2  (Read 5807 times)

0 Members and 1 Guest are viewing this topic.

Offline shehri

  • Regular Member
  • ***
  • Posts: 54
  • Mole Snacks: +2/-5
Nature of bonding in CO & CO2
« on: May 03, 2007, 03:41:04 AM »
Hi friends,

             I want to know the nature of bonding in CO & CO2.Also I'm a bit confused about value of dipole moment in CO.Why Carbon in CO becomes partially -Ve despite Oxygen being more electronegative than Carbon.My text books does'nt provide me required explanations & I'm living such special circumstances that I'm unable to access some chemistry expert.My only source is WWW.Thanks in advance.
Logged

Offline Bakegaku

  • Full Member
  • ****
  • Posts: 269
  • Mole Snacks: +20/-5
  • Gender: Male
  • Hydrogen peroxide is my miracle cure to everything
Re: Nature of bonding in CO & CO2
« Reply #1 on: May 03, 2007, 09:56:05 PM »
Hmm.. Well CO has a triple or double bond (can't think of structure right off top of my head).  Since either way the carbon falls short of the number of bonds it must form to be stable (four), it's given the standard charge of -

I believe my chem teacher mentioned when teaching us how to draw Lewis structures that if an element has more bonds than it should, it has a + charge while one less gives it a -.
Logged
"True knowledge exists in knowing that you know nothing"
-Socrates

"I see, I forget.  I hear, I remember.  I do, I understand"
-Confucius

"Nothing will benefit human health and increase chances for survival of life on Earth as much as the evolution to a vegetarian diet."
- Albert Einstein?

"American cartoons place characters in situations; anime
places situations around characters.  Anime characters
are not like fictional characters but more like fictional
people; their actions stem directly from their personalities,
and not just as a means to move the story's plot
forward.  We are made to sympathize with them, and
not simply be entertained by them."
~John Oppliger~

Offline ARGOS++

  • Sr. Member
  • *****
  • Posts: 1489
  • Mole Snacks: +199/-56
  • Gender: Male
Re: Nature of bonding in CO & CO2
« Reply #2 on: May 06, 2007, 12:43:47 PM »

Dear shehri,

The nature of the CO is one Triplebond, plus for each atom one nonbonding e-paar.
With this in mind you are right, if you think of it as a “clone” of N2, because nearly all physically properties of both are close to indistinguishable.
I know in the moment only one difference of both, as only CO has a recognisable dipole moment, of course not an extremely one, because C (EN = 2.5) and O (EN = 3.5) are quite close together.

CO2 in contrary has not “any” dipole moment, because it is linear in the form: O=C=O with the required nonbonding e-paars on the O. That means that the centres of both charges are located inside the Carbon.
As the molecule is very stable, tells you the corresponding acid will be of very week nature.

I hope, it gives you the wished ideas.

Good Luck!
                    ARGOS++

Logged

Offline Sam (NG)

  • Chemist
  • Full Member
  • *
  • Posts: 223
  • Mole Snacks: +12/-3
  • Gender: Male
  • Surface Modification
Re: Nature of bonding in CO & CO2
« Reply #3 on: May 08, 2007, 06:26:21 PM »
Argos, is the non-bonding "pair" that you are referring to on each atom the core electrons (1s), because otherwise, according to MO theory, i don't see any non-bonding pairs.
Logged

Offline Yggdrasil

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3215
  • Mole Snacks: +485/-21
  • Gender: Male
  • Physical Biochemist
Re: Nature of bonding in CO & CO2
« Reply #4 on: May 08, 2007, 09:17:26 PM »
Won't there be an occupied σ*orbital formed from the 2s orbitals?
Logged

Offline Sam (NG)

  • Chemist
  • Full Member
  • *
  • Posts: 223
  • Mole Snacks: +12/-3
  • Gender: Male
  • Surface Modification
Re: Nature of bonding in CO & CO2
« Reply #5 on: May 09, 2007, 03:58:11 AM »
Quote from: Yggdrasil on May 08, 2007, 09:17:26 PM
Won't there be an occupied σ*orbital formed from the 2s orbitals?

Yes, this is antibonding, otherwise the bond order would be 4.
Logged

Offline Yggdrasil

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3215
  • Mole Snacks: +485/-21
  • Gender: Male
  • Physical Biochemist
Re: Nature of bonding in CO & CO2
« Reply #6 on: May 09, 2007, 04:24:00 AM »
Ah, nevermind my previous comment. I accidentally confused non-bonding with antibonding.
Logged

Offline Sam (NG)

  • Chemist
  • Full Member
  • *
  • Posts: 223
  • Mole Snacks: +12/-3
  • Gender: Male
  • Surface Modification
Re: Nature of bonding in CO & CO2
« Reply #7 on: May 09, 2007, 06:14:52 AM »
Quote from: Yggdrasil on May 09, 2007, 04:24:00 AM
Ah, nevermind my previous comment. I accidentally confused non-bonding with antibonding.

Happens to us all :)
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links