1 / 22

Robert M. Hanson , Paul R. Campbell, Marc A. Klingshirn, and Gary O. Spessard St. Olaf College

Using the web-based Green Chemistry Assistant to enhance understanding of chemical reactions and processes. Robert M. Hanson , Paul R. Campbell, Marc A. Klingshirn, and Gary O. Spessard St. Olaf College Northfield, MN 55057 hansonr@stolaf.edu

lyndon
Download Presentation

Robert M. Hanson , Paul R. Campbell, Marc A. Klingshirn, and Gary O. Spessard St. Olaf College

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Using the web-based Green Chemistry Assistant to enhance understanding of chemical reactions and processes Robert M. Hanson, Paul R. Campbell, Marc A. Klingshirn, and Gary O. Spessard St. Olaf College Northfield, MN 55057 hansonr@stolaf.edu 19th Biennial Conference on Chemical Education, Purdue University Aug 3, 2006

  2. Green Chemistry Definitions • “The utilization of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture, and application of chemical products.” -- Anastas and Warner; Doxie and Hutchison. • “The design of chemical products or processes to reduce or eliminate the use or generation of hazardous substances.” -- Tundo and Anastas, Green Chemistry: Challenging Perspectives, 2000.

  3. Three Levels of Green Chemistry Processes www.shelldeerpark.com/chemical.htm

  4. Three Levels of Green Chemistry Reactions http://www.uncw.edu/smec/gk_fellows/askscience.html

  5. Three Levels of Green Chemistry Equations HCl (aq) + NaOH (aq) NaCl (aq) + H2O (l)

  6. http://fusion.stolaf.edu/gca http://fusion.stolaf.edu/gca/goc1.htm http://fusion.stolaf.edu/gca/goc2.htm http://fusion.stolaf.edu/gca/goc3.htm

  7. http://fusion.stolaf.edu/gca/goc1.htm

  8. http://fusion.stolaf.edu/gca/goc2.htm

  9. http://fusion.stolaf.edu/gca/goc3.htm

  10. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Lessons learned: • Students need help just writing the balanced chemical equations. • Process is important, as most real experiments involve more than one process step.

  11. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Lessons learned: • Lab manuals could be more explicit in guiding students to an understanding of the overall set of process steps they will be doing in lab.

  12. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Question: What is the balanced chemical equation for this reaction?

  13. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Is it this?... (atom economy = 88%)

  14. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca …or this? (atom economy = 66%)

  15. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Question: What is the balanced chemical equation for this reaction?

  16. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Question: Is this one reaction or two?

  17. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Question: What is the atom economy?

  18. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Overall Atom Economy = 60%

  19. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Overall Atom Economy = 72%

  20. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca In practice, Step 3 is important!

  21. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca Lessons learned: • Getting students thinking about the overall process is good. • Expecting them to do it on their own because it’s “simple” is asking too much. • The Green Chemistry Assistant enables us to explore the nature of green chemistry processes and green chemistry measures.

  22. Green Chemistry Assistanthttp://fusion.stolaf.edu/gca • Faculty • Gary Spessard, Marc Klingshirn, Paul Jackson • Students • Paul Campbell, Allison Christensen, Elizabeth R. Johnson, Tim Barker, Tyler Drake, David Harris • Technology Support • Dan Beach • Financial support • WM Keck Foundation • Howard Hughes Medical Institute

More Related