Learning Outcomes for UNIT 3

Each student should have a good grasp of the following learning outcomes for unit 3. Unit 3 is assessed on Exam 3 which is on Tuesday 11/1/11 from 7-9 PM. Read the bulleted points and self assess yourself on how well you know the topic.

Students will be able to...

• apply the VSEPR model to determine a molecule's electronic geometry and molecular geometry from its Lewis dot structure.
• apply the VB model to give the atomic hybridization of any atom in a given molecule.
• use the VB model to describe any bond in a model.
• interpret line drawing of chemical compounds with implicit hydrogens, carbons, and lone pairs.
• identify sigma and pi bonds.
• recognize localized vs delocalized electrons within a structure.
• identify polar bonds (we will assume C-H bonds are non-polar)
• determine if a molecule is polar based on polar bonds and it molecular geometry.
• recognize that MO theory is a quantum mechanical method used by chemists to determine the energy of the electron in a molecule as well as its geometry.
• recognize that MO theory can be used to determine the energy of light absorbed by a compound by exciting electrons between MOs (from the HOMO to the LUMO).
• should be able to interpret a given MO diagram as well as fill in electrons into an MO diagram to predict bond order for a compound and predict whether it is paramagnetic or diamagnetic.
• recognize that constructive interference of atomic orbitals yields lower energy MO (bonding) while destructive interference leads to higher energy MO (anti-bonding)
• be able to define the three major intermolecular forces (IMF) discussed in class: dipole-dipole, h-bonding, and dispersion (London, van der Waals, induced dipole- induced dipole, instantaneous dipole- instantaneous dipole)
• use a compound's molecular structure to identify the types of IMFs that exists in the condensed phase.
• relate the IMFs to liquid properties such as boiling point, vapor pressure, viscosity, and surface tension.
• explain how size and shape affect the magnitude of the dispersion forces.
• recognize the four types of solids: network (covalent), metallic, ionic, and molecular.
• recognize how the macroscopic properties of solids (melting point, hardness, conductivity, ...) can be explained by the microscopic model of solids.