Talk:Bond dissociation energy
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[edit] Bond dissociation energy vs. bond energy
Science world says this and bond energy are the same. We say different. Which is correct? - Taxman Talk 17:37, August 1, 2005 (UTC)
- in many case the values will be similar but in other there are differences, see the water example , to state that they are the same would be an oversimplification V8rik 15:22, 2 August 2005 (UTC)
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- This article currently states that bond energy is the sum of all the bond dissociation energies in a molecule, but the Bond energy article does not seem to go with this definition. How can this be clarified?--GregRM 13:58, 8 July 2006 (UTC)
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- I think I understand it somewhat now...the bond energy is not the sum itself, but is calculated from the sum.--GregRM 14:02, 8 July 2006 (UTC)
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- I agree with the OP - Wikipedia articles must come from prior published material, and every mention I can find of bond dissociation energy says it is equal to the bond energy. My main source is the Silberberg Chemistry 4th edition, but the OP mentions a Science World article as well. --169.233.62.35 19:00, 14 July 2006 (UTC)
- Fair enough, I provided a reference and another example explaining the difference from the same reference. I quess that in other publications the two are the same for practical purposes. and who is OP? V8rik 20:14, 14 July 2006 (UTC)
- I am guessing OP stands for "original poster" or something similar.--GregRM 00:21, 24 July 2006 (UTC)
[edit] Clarification of bond energy method
The sentence mentioning that the bond energy is calculated from the sum seems potentially misleading...it says that the bond energy is calculated based on the sum of the bond dissociation energies of all bonds within the molecule. However, one might say for water, for example, that since the two OH bonds in the water molecule are equivalent, the average based on the sum of the two is the same as the first OH dissociation. Perhaps it could be worded more precisely to emphasize the distinction illustrated in the example; perhaps something along the lines of: "...bond energy, which is calculated based on the average of the bond dissociation energies associated with sequentially breaking all X-Y bonds in a molecule (where X-Y is the bond of interest)."; or perhaps "...bond energy, which is calculated based on the sum of the bond dissociation energies associated with sequentially breaking up a molecule into its constituent atoms." Note that I'm not sure which (if any) of these statements is correct and still holds for more complicated molecules...I would have to look into this some more. Does either of these agree with the general method discussed by the textbook reference?--GregRM 00:21, 24 July 2006 (UTC)
[edit] Units
The units listed in the article are kcal/mol, should the units be SI (J/mol) as that is the proper scientific convention? later units in the article are also in J/mol
- The Wikipedia:Manual of Style (dates and numbers) suggests using SI for all articles, where there are not compelling reasons to do otherwise. Based on this argument, I would use kJ/mol. However, the scientific literature (J. of Chemical Physics, J. of Physical Chemistry) are rife with both units. Therefore, I suggest sticking to the units of the source, with converted units in parenthesis, as suggested in the style manual, under the units of measurement heading. Az7997 18:28, 17 November 2006 (UTC)
