Molecular and Empirical Forumlas from Percent Composition. Example 2.9 from Kotz Chemistry book.
It is important that chemists agree on notation and nomenclature in order to communicate molecular constitution and configuration. It is best when a diagram is as faithful as possible to the 3-dimensional shape of a molecule, but the conventional Fischer projection, which has been indispensable in understanding sugar configurations for over a century, involves highly distorted bonds. Ambiguity in diagrams or words has led to multibillion-d...more
Professor McBride begins by using previous examples of "pathological" bonding and the BH3 molecule to illustrate how a chemist's use of localized bonds, vacant atomic orbitals, and unshared pairs to understand molecules compares with views based on the molecule's own total electron density or on computational molecular orbitals. This lecture then focuses on understanding reactivity in terms of the overlap of singly-occupied molecular orbit...more
Empirical and Molecular Formulas from Stoichiometry.
Professor Sylvia Ceyer covers the molecular orbital theory, beginning with a discussion of some key topics including bonding orbitals, antibonding orbitals, electron configurations, and bond order. Using a wealth of examples to depict molecular orbitals (MOs) formed by the linear combination of atomic orbitals (LCAO), she concludes with heteronuclear diatomics.
(April 7, 2010) Robert Sapolsky continues his series on molecular genetics in which he discusses domains of mutation and various components of natural selection on a molecular level. He also further assesses gradualism and punctuated equilibrium models of evolution, integrating these theories into an interrelated model of development.
Introduction to molecular and empirical formulas. Calculating molecular mass.