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Bell Ringer

Bell Ringer. Take out homework packet (the landscape one with 20 lewis structures) What elements will form double or triple bonds? (5 elements). Bell Ringer. Due Thursday, October 16! You should have page one completed and start working on pages 2 & 3 this weekend. Don’t worry about naming.

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Bell Ringer

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  1. Bell Ringer • Take out homework packet (the landscape one with 20 lewis structures) • What elements will form double or triple bonds? (5 elements)

  2. Bell Ringer

  3. Due Thursday, October 16! You should have page one completed and start working on pages 2 & 3 this weekend. Don’t worry about naming.

  4. We have textbooks!  • Modern Chemistry • My.hrw.com • How to log in: Login: Student’s g.risd.org email (initials + student ID @g.risd.org) Password: Risd-last three #’s of ID (note the capitalized letter) Example: Juan C. Ramirez Gonzales with an ID of 123456 Login: jr123456@g.risd.org Password: Risd-456

  5. VSEPR – Valence Shell Electron Pair Repulsion • Areas of electrons around a central atom tend to spread out to reduce electrostatic repulsion • Areas of electron density = bonded electrons OR unbonded electrons (lone pairs)

  6. VSEPR THEORY

  7. Bell Ringer • Tell me the difference between a single, double and triple bond. • Give an example of an element that might • Triple bond? • Double bond • Single bond?

  8. VSEPR theory states electrons pairs shared (in bonds) or unshared (lone pair) will adopt a geometry that maximizes the distance between the bonds or lone pairs. • lone pairs and bonds will be referred to as regions of high electron density • double and triple bonds will count only as 1 region of high electron density

  9. The geometry or shape around the central atom will depend upon: • The number of bonding electron pairs or shared pairs (multiple bonds count as a single shared pair) on the central atom • The number of non-bonding pairs or unshared pairs found on the central atom (lone pair)

  10. Polar vs Nonpolar • Polar compounds are asymmetrical and end up with areas with partial charges. This can be due to: • 1. lone pairs on the central atom • 2. different terminal atoms • 3. different types of bonds (one single bond and one triple bond) • Nonpolar compounds are symmetrical with their charges evenly distributed.

  11. A pair of electrons is any one of the following: • a non-bonding pair of electrons • a single bond • a double bond • a triple bond

  12. AX6 OCTAHEDRAL

  13. EXAMPLE SeF6 OCTAHEDRAL

  14. AX4 TETRAHEDRAL 109.5°

  15. AX4EXAMPLE CH4

  16. AX3E EXAMPLE NH3 TRIGONAL PYRAMIDAL

  17. AX2E2 EXAMPLE H2S BENT

  18. AX3 TRIGONAL PLANAR 120°

  19. AX3 EXAMPLE BH3 TRIGONAL PLANAR

  20. AX3 WITH DOUBLE BOND H2CO TRIGONAL PLANAR

  21. AX2E EXAMPLE SO2 BENT

  22. AX2 LINEAR 180°

  23. AX2 EXAMPLE BH2 LINEAR

  24. AX2 WITH DOUBLE BOND CO2

  25. Exit Ticket • On page 2 of HW packet draw the lewis structure and 3D model for: BeH2 Also, Determine the polarity of the molecule. Write the name of the shape.

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