Molecular Geometry: Investigating Molecular Shapes with VSEPR
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AMHS AP CHEMISTRY MOLECULAR GEOMETRY DILL LAB Molecular Geometry: Investigating Molecular Shapes with VSEPR using Molecular Modeling Kits Objective Students will explore Lewis Structures of selected substances and then represent the structures on paper after building models using molecular model kits. The molecular geometry of the molecule, hybridization, the polarity, and the IMF’s will be determined for each of the substances. Possible resonance structures and formal charges will also be explored for a few of the structures. Materials Model sets Procedure 1. All of the substances on the following sheet are covalent molecules or polyatomic ions. 2. Cut and paste each of the following sections into your DILL (you may want to paste in as you go…some molecules will require more room and possibly multiple structures for resonance). 3. Carefully draw Lewis Structures in the designated section of your DILL. Use the VSEPR theory to predict the molecular geometry of each molecule or ion listed. 4. Use the model kits provided to build each chemical species. 5. Using the model you built in 4 above, determine the bond angle(s) present on each structure and indicate the angle on your drawing. 6. Write the hybridization, determine the presence of a dipole and indicate the direction on the drawing as well. 7. Predict the type(s) of IMF’s that might be found in a pure sample of each of the substances. Based on this decision, do your best to predict the room temperature phase of the sample. Research each of the substances and then either confirm or correct your predicted phase with explanation! 8. Make certain all of the information generated from this work is recorded in the ‘cut-n-paste’ sections of your DILL. 9. Include possible resonance structures where needed and utilize formal charges if the structures are unequal. Indicate the preferred structure and justify your choice. AMHS AP CHEMISTRY 1. CO2 MOLECULAR GEOMETRY 2. BF3 DILL LAB 3. SO2 Molecular geometry Molecular geometry Molecular geometry Bond angle Bond angle Bond angle Hybridization Hybridization Hybridization Polarity Polarity Polarity IMF & Phase IMF & Phase IMF & Phase 4. PF5 5. SF4 6. SF6 Molecular geometry Molecular geometry Molecular geometry Bond angle Bond angle Bond angle Hybridization Hybridization Hybridization Polarity Polarity Polarity IMF & Phase IMF & Phase IMF & Phase 7. I3- 8. H2CO 9. XeF4 Molecular geometry Molecular geometry Molecular geometry Bond angle Bond angle Bond angle Hybridization Hybridization Hybridization Polarity Polarity Polarity IMF & Phase IMF & Phase IMF & Phase 10. NO2- 11. SCN- Molecular geometry Molecular geometry Molecular geometry Bond angle Bond angle Bond angle Hybridization Hybridization Hybridization Polarity Polarity Polarity IMF & Phase IMF & Phase IMF & Phase 12. CH3COOH AMHS AP CHEMISTRY 13. XeF5+ MOLECULAR GEOMETRY 14. ICl3 DILL LAB 15. SiH2Br2 Molecular geometry Molecular geometry Molecular geometry Bond angle Bond angle Bond angle Hybridization Hybridization Hybridization Polarity Polarity Polarity IMF & Phase IMF & Phase IMF & Phase 18. SO42- (this molecule does have resonance 16. N2O 17. H3O+ Molecular geometry Molecular geometry Molecular geometry Bond angle Bond angle Bond angle Hybridization Hybridization Hybridization Polarity Polarity Polarity IMF & Phase IMF & Phase IMF & Phase structures and double bonds)
