Digital Help Sessions to
Enhance Chemistry Courses
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Dr. Robert R. Klepper
Professor of Chemistry
Iowa Lakes Community College
Estherville, Iowa
Challenges Faced
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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
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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
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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