Št. zadetkov: 77
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
Professor McBride outlines the course with its goals and requirements, including the required laboratory course. To the course's prime question "How do you know" he proposes two unacceptable answers (divine and human authority), and two acceptable answers (experiment and logic). He illustrates the f ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
Professor McBride begins by following Newton's admonition to search for the force law that describes chemical bonding. Neither direct (Hooke's Law) nor inverse (Coulomb, Gravity) dependence on distance will do - a composite like the Morse potential is needed. G. N. Lewis devised a "cubic-octet" theo ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
Continuing the discussion of Lewis structures and chemical forces from the previous lecture, Professor McBride introduces the double-well potential of the ozone molecule and its structural equilibrium. The inability for inverse-square force laws to account for stable arrangements of charged particle ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
This lecture asks whether it is possible to confirm the reality of bonds by seeing or feeling them. It first describes the work of "clairvoyant" charlatans from the beginning of the twentieth century, who claimed to "see" details of atomic and molecular structure, in order to discuss proper bases fo ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
Professor McBride introduces the theory behind light diffraction by charged particles and its application to the study of the electron distribution in molecules by x-ray diffraction. The roles of molecular pattern and crystal lattice repetition are illustrated by shining laser light through diffract ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
Professor McBride uses a hexagonal "benzene" pattern and Franklin's X-ray pattern of DNA, to continue his discussion of X-ray crystallography by explaining how a diffraction pattern in "reciprocal space" relates to the distribution of electrons in molecules and to the repetition of molecules in a cr ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
After pointing out several discrepancies between electron difference density results and Lewis bonding theory, the course proceeds to quantum mechanics in search of a fundamental understanding of chemical bonding. The wave function ψ, which beginning students find confusing, was equally confusing to ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
Professor McBride expands on the recently introduced concept of the wave function by illustrating the relationship of the magnitude of the curvature of the wave function to the kinetic energy of the system, as well as the relationship of the square of the wave function to the electron probability de ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
After showing how a double-minimum potential generates one-dimensional bonding, Professor McBride moves on to multi-dimensional wave functions. Solving Schrödinger's three-dimensional differential equation might have been daunting, but it was not, because the necessary formulas had been worked out m ...
Leto:
2008
Vir:
videolectures.net
Video in druga učna gradiva
Oznake:
chemistry;organic chemistry
In discussions of the Schrödinger equation thus far, the systems described were either one-dimensional or involved a single electron. After discussing how increased nuclear charge affects the energies of one-electron atoms and then discussing hybridization, this lecture finally addresses the simple ...
Leto:
2008
Vir:
videolectures.net