Section 4

NOTE: due to the eclectic (for want of a better word) order in Chapter 8, I will be jumping around somewhat.  In total, we are covering all of Chapter 8 in the course, but 8.5 is discussed in Section 6 (Liquids and Solids) and 8.8 is covered in section 8 (Thermochemistry).
Class 14

Oct. 9

Before Class Assignment

  • read sections 8.1, 8.4, 8.9-8.12
Topics
  • ionic bonding
  • Lewis Structures

Learning Objectives

  • understand the nature of ionic bonds
  • learn to draw Lewis Structures, a model that accounts for the connectivity of atoms in a molecule
After Class Homework
  • Chapter 8: 15, 17, 43, 81, 83, 87, 97, 105
 
Class 15

Oct. 11

Before Class Assignment

  • read section 8.13 
Topic
  • shapes of molecules (VSEPR)

Learning Objective

  • learn to predict the three-dimensional shape of molecules from the Lewis Structure, using the Valence-Shell Electron-Pair Repulsion (VSEPR) theory
After Class Homework
  • Chapter 8: 89, 91, 97, 101, 113
 
  
Class 16

Oct. 16

Before Class Assignment

  • read sections 8.2, 8.3, 8.6, 8.7, 9.1
Topic
  • Valence Bond Theory

Learning Objectives

  • describe how atoms are held together in a molecule
  • understand orbital hybridization
After Class Homework
  • Chapter 8: 19, 27, 115, 119, 121, 125, 137, 157, 163
  • Chapter 9: 23, 29
  • Chapter 14: 33
 
  
Class 17

Oct. 18

Before Class Assignment

  • read sections 21.1 to 21.6 (skip the section titled "Stereoisomerism" in section 21.4)
Topic
  • ligands and coordination compounds
  • crystal field theory

Learning Objectives

  • understand the term ligand, and how ligands combine with transition metals to form coordination compounds
  • understand isomerism in coordination compounds
  • understand the three-dimensional shapes of coordination compounds
  • understand bonding in transition metal coordination compounds using the crystal field theory
After Class Homework
  • Chapter 21: 5, 23, 25, 43, 45

 
Class 18
 
Oct. 21

Before Class Assignment

  • read Appendix 3
Topic
  • Beer's Law (also known as the Beer-Lambert Law)

Learning Objectives

  • understand the quantitative relationship between concentration and intensity of colour (Beer's Law, A = εbc)
After Class Homework
  • Chapter 21: 17, 49, 51, 53, 55, 77

Beer's Law exercises:

(1)  0.0151 g of KMnO4 was dissolved in water in a 1.000 L flask.  The absorbance was measured to be 0.224 at 525 nm.  What is the molar absorptivity coefficient for MnO4- at 525 nm?  A standard 1.00 cm cell was used for this measurement.

(2)  Brad finds an old bottle of KMnO4 solution in the storeroom, but the label is damaged so he doesn't know the concentration.  He takes a 1.000 mL aliquot of the solution and dilutes it with water in a 50.00 mL flask.  Using a short-path cell (0.250 cm), the spectrophotometer reads A = 0.107 at 525 nm.  What is the concentration of KMnO4 in the bottle?

  • Answers:  (1) ε = 2.34 × 103 L mol-1 cm-1  (2)  [KMnO4] = 9.15 × 10-3 M

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Last updated, June 28, 2013
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