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How effective are computer simulations and models when teaching Valence Shell Electron Pair Repulsion (VSEPR)?

How effective are computer simulations and models when teaching Valence Shell Electron Pair Repulsion (VSEPR)?. Purdue University Christine Ashmore-Good Gabriela Weaver John Nash. Goals. To determine if students learn VSEPR differently with different teaching methods

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How effective are computer simulations and models when teaching Valence Shell Electron Pair Repulsion (VSEPR)?

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  1. How effective are computer simulations and models when teaching Valence Shell Electron Pair Repulsion (VSEPR)? Purdue University Christine Ashmore-Good Gabriela Weaver John Nash

  2. Goals • To determine if • students learn VSEPR differently with different teaching methods • models and simulations are necessary to learn VSEPR • models and simulations differ in their effectiveness • What is the most effective combination of tools for teaching/learning VSEPR?

  3. What to Test • Use of traditional 2-D drawings in lecture • Use of CHIME simulations in lecture • Use of a VSEPR lab with CHIME simulations • Use of a VSEPR lab with models

  4. Model Kits

  5. Model Kits

  6. CHIME Simulations The webpage (http://www.chem.purdue.edu/gchelp/vsepr/) • describes how to count the regions of electron density around a central atom • allows students to make comparisons between different geometries • allows for rotation of compounds in order to better see the orientation of the atoms • makes use of many practice problems

  7. CHIME Simulations

  8. CHIME Simulations

  9. CHIME Simulations

  10. CHIME Simulations

  11. VSEPR Laboratory CHIME Lab • students must access website to learn VSEPR rules (prelab) • students use website to help complete handout

  12. VSEPR Laboratory Models Lab • students are given VSEPR rules (prelab) • students build models then draw the 3-D representation of compounds

  13. Research Design *projected dates

  14. Results Pre-Survey Scores Post-Survey Scores

  15. Results Post-Surveys Pre-Surveys

  16. Results Absolute Improvement Possible Improvement

  17. Results

  18. Interesting Observations Pre-Survey Scores with Percentage out of 12 Post-Survey Scores with Percentage out of 12 Chem 123 is for the top 10% of the Engineering program.Chem 125 contained a large number of Physics majors.

  19. Future Studies • Repeat Models Lab to increase size of group and duplicate results • Redesign CHIME lab to require students to use website to complete lab • Test Models Lab with CHIME prelab

  20. Acknowledgements • Bill Robinson, Purdue University • Paul Kelter, University of Illinois • Model kits from Indigo Instruments, http://www.indigo.com/models/vsepr-theory-model-sets.html

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