CHEM-UA 126 Study Guide - Midterm Guide: Weak Base, Galvanic Cell, Acid Dissociation Constant
24 Jun 2015
School
Department
Course
Professor
Document Summary
Chapter 11: vsepr model: enables you to predict molecule shapes; doesn"t explain how/why covalent bonds form or address variation in bond strength. Accounts for observed differences in strengths of covalent bonds; attribute differences to overlap of unique combinations of various types of atomic orbitals. *covalent bonds are the result of overlap of atomic orbitals. Requires energy to occur, but energy expenditure is more than compensated when bonds form (bond formation = exothermic, energetically favorable) Doesn"t occur in isolated atoms; used only to explain bonding scheme of molecule: constituent atoms: noncentral atoms, hybrid orbitals: new atomic orbitals resulting from mixing of 2 or more nonequivalent atomic orbitals of same atom. Different in shape & orientation from any of the original atomic orbitals: sigma bond: end-to-end overlap of orbitals; involves sharing of only 2 electrons, pi bond: side-to-side overlap of orbitals. 1 pi bond + 1 sigma bond = double bond.
