Education For All

Text size
  • Increase font size
  • Default font size
  • Decrease font size

Lectures (Video)

Course Home

Introductory Organic Chemistry - Lecture 35

Get the Flash Player to view video.
Lecture 35 - Understanding Molecular Structure and Energy through Standard Bonds

Although molecular mechanics is imperfect, it is useful for discussing molecular structure and energy in terms of standard covalent bonds. Analysis of the Cambridge Structural Database shows that predicting bond distances to within 1% required detailed categorization of bond types. Early attempts to predict heats of combustion in terms of composition proved adequate for physiology, but not for chemistry. Group- or bond-additivity schemes are useful for understanding heats of formation, especially when corrected for strain. Heat of atomization is the natural target for bond energy schemes, but experimental measurement requires spectroscopic determination of the heat of atomization of elements in their standard states.

Prof. J. Michael McBride
CHEM 125: Freshman Organic Chemistry, Fall 2008
(Yale University: Open Yale)
Date accessed: 2009-11-11
License: Creative Commons BY-NC-SA

Lecture Material

Click the play button to start the slideshow above (the slides will be displayed for 10 sec before advancing to the next slide). You can navigate the slides manually by using the back and forward buttons. Clicking the slide itself will advance to the next slide.

To download the above lecture material use this link. (Right-click and select Save Target As or Save Link As.)

Supplementary lecture material is listed below.

1. Non-Spherical Bromine



Chinese (Simplified) French German Italian Japanese Korean Portuguese Russian Spanish
More educational resources: