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Scaffolding a Conceptual Understanding of the Gas Phase in General Chemistry Enriched with Technology. Scott A. Sinex and Barbara A. Gage Department of Physical Sciences and Engineering Prince George’s Community College.

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Scaffolding a Conceptual Understanding of the Gas Phase in General Chemistry Enriched with Technology

Scott A. Sinex and Barbara A. Gage

Department of Physical Sciences and Engineering

Prince George’s Community College

Presented at the 230th National Meeting of the American Chemical Society in Washington, DC on 28 August - 1 September 2005.


Your objectives in gases

Liquids and IMF’s General Chemistry Enriched with Technology

Your objectives in gases…

  • Behavior and properties of gases

  • Introduce the ideal gas law and combined gas law

  • Finding molar mass and gas density

  • Kinetic-molecular theory

  • Real gas behavior

...but we don’t want to lecture!


What why
What & Why? General Chemistry Enriched with Technology

  • Discovery laboratory experience

  • Build and extend qualitative into quantitative mathematical relationships

  • Extend knowledge from ideal gases into real gases after covering liquids and intermolecular forces

  • All steps enriched by using technology

  • Student- or learner-centered activities


How or technology involved
How? or Technology involved... General Chemistry Enriched with Technology

  • Webpage with links and pdf handouts

  • Multi-layered Interactive Excel

  • Animations as

    • Flash from Odyssey

    • NetLogo Java applet

    • Movie from SnagIt(screen-capture software)

The complete package of materials:

http://academic.pgcc.edu/psc/chm101/ideal_gas


The behavior of gases

V General Chemistry Enriched with Technology

P

The Behavior of Gases

  • Laboratory activity (<2.5 hours)

  • Macroscopic behavior

  • Mostly qualitative relationships

  • P-V experimental

    data collected

PV = k

Our complete General Chemistry I lab manual.


The scaffold... General Chemistry Enriched with Technology

Post-laboratory student- centered computer-based activity with discussion

Discovery-based laboratory activity


The ideal gas law
The Ideal Gas Law General Chemistry Enriched with Technology

  • Interactive Excel spreadsheet

    • Graphical analysis and interpretation

    • Quantitative symbolic relationships (P-V-T-n)

    • Influence of error

  • html document with animations

    • pdf printable version as handout

    • Microscopic aspects incorporated using Odyssey® converted to Flash files and NetLogo Java applet

    • Dropdown menu with selected numerical answers

Link to web activity


Outcomes for students
Outcomes for students... General Chemistry Enriched with Technology

  • Many experimental observations and predictions

  • Relating macroscopic and microscopic behavior via animations

  • Symbolic relationships derived

  • Many “what if” scenarios via numerical experimentation

  • Effects of “constant variables” and error


Student responses
Student responses… General Chemistry Enriched with Technology

  • Survey students on the use of the technology

  • Pre- and post-assessment of concept understanding


For further information
For further information… General Chemistry Enriched with Technology

  • The complete activity online - click here

  • Constructing an interactive Excel spreadsheet – click here

  • Scott Sinex

  • Barbara Gage


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