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Topic: Bond or Bond Not?  (Read 5995 times)

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Offline Donaldson Tan

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Bond or Bond Not?
« on: November 09, 2004, 09:00:08 AM »
Be2 is predicted from MO theory to have a bond order of zero. However at low temperatures Be2 can be observed. Explain.
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Offline Donaldson Tan

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Re:Bond or Bond Not?
« Reply #1 on: November 12, 2004, 12:43:36 PM »
hint: benzoic acid exhibits a Mr double its molecular weight in vapour phase.
« Last Edit: November 12, 2004, 12:43:51 PM by geodome »
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"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Offline Donaldson Tan

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Re:Bond or Bond Not?
« Reply #2 on: November 19, 2004, 07:30:05 AM »
At low temperature, the kinetic energy of Be atoms are not sufficient to overcome the van der Waals' forces (VDW). Hence they bond together by VDW to form Be2 molecules. Technically, this bond isn't a covalent bond.
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"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Offline srihari

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Re: Bond or Bond Not?
« Reply #3 on: January 06, 2010, 08:20:04 AM »
thanks dude nice info
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Offline Schrödinger

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Re: Bond or Bond Not?
« Reply #4 on: January 09, 2010, 11:40:31 AM »
Is Be the only molecule that exists, despite having a Bond Order of zero as per MO theory?
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