Reading: CHP 4 Symmetry - Examples and Applications: 4.4

PreAssignment: Watch slideshows below

Learning Outcomes:

  • Determine the symmetry properties for the motions of small molecules
    • Quickly produce a reducible representation containing information about the motions of a molecule
    • Use character tables to find reducible representations and assign symmetry labels to molecular motions
    • Use character tables to determine the active vibrational and rotational modes
  • Determine the active vibration stretches for metal-carbonyl complexes

Group Activity - Vibrations and Symmetry POGIL worksheet


Exercises:  4.7, 4.12, 4.13
Problem Set (4th Ed): 4.19, 4.21, 4.20, 4.22, Exam I| 4.24 (this is a pretty long problem), 4.26, 4.27, 4.29 (solutions)

Problem Set (5th Ed): 4.21, 4.23, 4.22, 4.24, Exam I| 4.26 (this is a pretty long problem), 4.28, 4.29, 4.31 (solutions)

 

Covers Chapters 2-4 ending with problem 4.24

Key for Exam I

In your study Focus on problems and worksheets first.
If you need extra problems for a certain topic let me know.

There will be at least one question that asks you to analyze data or a figure from chapter 2 (Radial plots, inoization trends, fig 2.12 for examples)
There will be one problem from chapter 3 that asks you to write a Lewis structure and VSEPR shape and discuss trends in molecular properties.
There will be at least one assignment of an object into a point group.
There will be one creation of a reducible and also reducing it to irreducble reps.
There will be some questions abou character tables.

FYI> In about two weeks we will have an short exam on using symmtery to analyze virbrational structure and MOS.

Reading: CHP 5 Molecular Orbitals - Examples and Applications: 5.1 - 5.2.1

PreAssignment:

Learning Outcomes:

  • know conditions required to form MOs
  • be able to approximate the formation of molecular orbitals from atomic orbitals (LCAO) for simple homonuclear diatomics
    • MOs from s-orbitals
    • MOs from p-orbitals
  • understand some advantages (and disadvantages in using MOs over simple Lewis structures)
  • be able to produce the MO diagrams for diagrams
  • use the diagram to calculate bond order and multiplicity
  • identify the LUMO and HOMO in the diagram
  • use the diagrams to rationalize the relative stability of diatomics

 

Group Activity - Homonuclear MOs - dioxygen - POGIL worksheet


Problem Set (4th Ed): 5.2(a,b), 5.4 (solutions)

Problem Set (5th Ed): 5.2(a,b), 5.4 (solutions)

Reading: CHP 5 Molecular Orbitals - Homonuclear diatomics: 5.2

PreAssignment:

  • PreQuiz on reading
    1. Please bring to class drawings of the all the MOs orbitals that can be formed from interactions between
      • 2 p orbitals
      • Label your orbitals as bonding and anti-bonding
    2. Draw one example of an orbital that can be formed by an interaction between two d-orbitals
    3. Draw Lewis structures of O2+, O2, and O2-

  • Video: Drawing an MO Diagram for Homonuclear Diatomics O2 and F2

Learning Outcomes:

This section continues on the discussion of MOs for homonuclear molecules. It expands the discussion by introducing mixing of orbitals thus allowing for representation of more diatomics.

  • be able to produce MO diagrams for homonuclear diatomics, particularly second row elements
  • use MO diagrams to calculate bond order and multiplicity
  • identify the LUMO and HOMO in the diagram
  • use the diagrams to rationalize the relative stability of diatomics

Group Activity - We will discussing figures 5.5 - 5.8 in detail. Be prepared to discuss the figures in groups.


Problem Set (4th Ed): 5.2, 5.4, 5.3(a,b), 5.5, 5.6 (solutions)

Problem Set (5th Ed): 5.2, 5.4, 5.3(a,b), 5.5, 5.6 (solutions)

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