CHEM 1127Q Chapter Notes - Chapter 8-9: Valence Bond Theory, Orbital Hybridisation, Molecular Orbital Theory

• School: UConn
• Department: Chemistry
• Course: CHEM 1127Q
• Professor: Joseph De Pasquale

Document Summary

Scientific theory - strongly supported explanation for observed natural laws or large bodies of experimental data. Accepted theory - explains experimental data and capable to predict behavior. Vsepr theory - predicts 3d molecular shapes but does not explain chemical bonding. Known theories that describe electronic structure of atoms. Valence bond theory - describe covalent bond as overlap of half filled atomic orbitals that yield an electron pair shared between the two bonded atoms. Electrons feel attraction of nuclei (+) and repulsion of closeby electrons (-) Attraction between electron pairs (-) and two nuclei (+) is physical force. An orbital on one atom overlaps an orbital on a second atom. The single electrons in each orbital combine to form an electron pair. Overlap - a portion of one orbital and a portion of a second orbital occupy the same region of space. Strength of bond depends on overlap of orbitals involved. Determines energy of the system - when atoms are