Screencast 1.1
www.youtube.com/watch?v=vLkc9cdqdp8
This screencast walks you through Worked Example 1.11 to illustrate constructing and balancing a redox equation from half equations

Screencast 1.2
www.youtube.com/watch?v=XEtjW7PySCg 
This screencast walks you through Worked Example 1.14 to illustrate the stages in carrying out the calculation for a typical titration.

Screencast 1.3
www.youtube.com/watch?v=24pmSqoupJg
This screencast discusses the use of equilibrium constants in terms of concentrations and in terms of partial pressures.

Video clip 1.1
www.youtube.com/watch?v=tlGrBcgANSY 
This video clip illustrates the effect of temperature on the NO2/N2O4 equilibrium.

Video clip 1.2
www.youtube.com/watch?v=YMqyG9QG6oc 
This video clip uses Le Chatelier’s principle to explain the how the NO2/N2O4 equilibrium responds to changes of pressure.