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- Newsgroups: sci.edu
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!uvaarpa!vdoe386!radford!kgrossha
- From: kgrossha@radford.vak12ed.edu (Kurt Grosshans)
- Subject: Bond environment
- Message-ID: <1992Nov21.021648.10982@radford.vak12ed.edu>
- Organization: Virginia's Public Education Network (Radford)
- Date: Sat, 21 Nov 92 02:16:48 GMT
- Lines: 27
-
- Two questions on bonding:
-
- 1. Boron trifluoride- Being that boron "survives" as an
- electron deficient substance is known. From what I have read,
- the answer to why it does seems a bit odd. The two most common
- explanations are that there really is a resonating double bond
- within the compound-and- since fluorine is SO electronegative,
- there probably exists more ionic activity than we think.
-
- Can't both of these be measured empirically?
-
- 2. Bonds and environment-Given:
-
- CH4 ---> CH3 + H E = 435 kj/mol
- CH3 ---> CH2 + H E = 453 kj/mol
- CH2 ---> CH + H E = 425 kj/mol
- CH ---> C + H E = 339 kj/mol
-
- Why? My reading has informed me that the differences are due to
- the environmental situation of the C - H bond. HOW?
-
- What's a good explanation for the odd trend in the above
- example?
- --
- Kurt Grosshans
- kgrossha@radford.vak12ed.edu
-
-