Digital Help Sessions to Enhance Chemistry Courses

• Dr. Robert R. Klepper• Professor of Chemistry• Iowa Lakes Community College• Estherville, Iowa

Challenges Faced

• Too few instructors• Too many students• Many times under prepared students• Not enough time• Need to work many problems for student

understanding

• Digital help sessions were the necessary answer to the problem

• Increases student contact with the material• Decreases instructor total workload – Answer the same question less frequently– Increase the number of different problems the

instructor can work

• Help sessions done on Elmo

• Project as student sees them

• Finished help session

• Link from Web Page

• Link from online class

Link to presentations• Chapter 1: Chemistry: The Study of Change• • Chapter 2: Atoms, Molecules, and Ions• • Chapter 3: Mass Relationships in Chemical Reactions• 1) Lysine, an essential amino acid in the human body, contains C, H, O and N. In one experiment the complete combustion of 2.175 g lysine gave 3.94 g CO2 and

1.89 g H2O. In a separate experiment, 1.873 g lysine gave 0.436 g NH3. Calculate the empirical formula. The molar mass is approximately 150g, what is the molecular formula of lysine?

• • First, determine percent by mass.• • Then determine empirical formula and molecular formula.• Stoichiometry and Limiting Reagents• • 2)• Empirical Formula 01 • • • • Chapter4: Reactions in Aqueous Solutions• Balancing a Redox Reaction in a Basic Solution• acid Base Titration• Precipitation Reaction• • Chapter 5: Gases• root mean squared velocity01• Partial Presure01• Ideal Gas Law• Density using the ideal gas law• Molar Mass using the ideal gas law• Gas Stoichiometry• Empirical formula and the gas laws• Relationships within the ideal gas law with changing conditions• • Chapter 6: Thermochemistry• • Chapter 7: Quantum Theory and the Electronic Structure of Atoms

• Advantages• Students can attend when they have time• Students can watch over and over if they need

to• Students can request specific problems be

worked out just like in a regular help session• Instructor can archive year after year so library

grows.

• Disadvantages• Right now all formats for video are

proprietary, cannot save work as .avi or .mov