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Section 8.3 Lecture for Honors & Prep Chemistry

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- 1. Bellwork Pipe cleaner shapes # of “legs” picture name 2 3 4
- 2. The Valence-shell electron-pair repulsion (VSEPR) Model states that electron pairs in a molecule will be as far apart as they can be because they repel each other. Linear Trigonal planar Tetrahedral
- 3. An electron domain is an area around an atom where electrons are found.
- 4. An electron domain is an area around an atom where electrons are found. They can be bonding or non-bonding (lone pairs).
- 5. An electron domain is an area around an atom where electrons are found. They can be bonding or non-bonding (lone pairs). Bonding domains can contain two, four, or six e - .
- 6. The number of electron domains determines the electron-domain geometry.
- 7. The number of electron domains determines the electron-domain geometry. The number of lone pairs determines the final shape of the molecule.
- 9. <ul><ul><ul><li>The hydrogens in a methane molecule are at the four corners of a tetrahedron. </li></ul></ul></ul><ul><ul><ul><li>The bond angles are 109.5°. </li></ul></ul></ul>
- 10. <ul><ul><ul><li>The measured H—N—H bond angle in ammonia is only 107°. </li></ul></ul></ul>
- 11. <ul><ul><ul><li>The measured bond angle in water is about 105°. </li></ul></ul></ul>Lone Pair Bonding Pair
- 12. Lone pairs repel more than bonding electrons
- 13. Water’s bond angle is 104.5 ° (much less than the tetrahedral angle of 109.5°) because its lone pairs need extra room.
- 15. <ul><ul><ul><li>A carbon dioxide molecule is linear. </li></ul></ul></ul>
- 16. <ul><ul><ul><li>Nine Possible Molecular Shapes </li></ul></ul></ul>
- 17. <ul><ul><li>VSEPR theory enables prediction of 3-dimensional molecular shape because the valence electron pairs </li></ul></ul><ul><ul><ul><li>are attracted to each other. </li></ul></ul></ul><ul><ul><ul><li>form molecules with only four possible shapes. </li></ul></ul></ul><ul><ul><ul><li>stay as far apart as possible. </li></ul></ul></ul><ul><ul><ul><li>always form tetrahedral shapes. </li></ul></ul></ul>
- 18. Bellwork- VSEPR Theory Fill in the missing information 3D shape molecule Lewis structure # of e - domains ( bonding areas ) picture name methane CH 4 ammonia NH 3 water H 2 O
- 19. Bellwork- VSEPR Theory Fill in the missing information 3D shape molecule Lewis structure # of e - domains ( bonding areas ) picture name methane CH 4 4 ammonia NH 3 4 water H 2 O 4
- 20. Bellwork- VSEPR Theory Fill in the missing information 3D shape molecule Lewis structure # of e - domains ( bonding areas ) picture name methane CH 4 4 tetrahedral ammonia NH 3 4 trigonal pyramidal water H 2 O 4 bent

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