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Announcements Be respectful – no electronics please! **Please have your lab book out and open to page 72 if you have it with you.** There is discussion tomorrow! Lab & Textbook homework due tomorrow There is lab Monday after break! Exam 3 is on Thursday December 6!

Chem 101: Last 5 Weeks Calendar Monday Tuesday Wednesday Thursday Friday 12 13 14 15 16 19 20 21 22 23 26 27 28 29 30 3 4 5 6 7 10 11 Today Back from break Exam 3 101A Final Reading Day

Overall goal: Atomic Structure Chemical Bonding 3D Molecular Structure Molecular Properties

Clicker #1 Which of the following supports why Lewis structures are not a completely accurate way to draw molecules? A) The Lewis structure for O2 shows all electrons as paired but when liquid O2 is poured onto a magnet, it behaves as a molecule with an unpaired electron. B) There are sometimes multiple valid Lewis structures for a single chemical species. C) When adding up the number of valence electrons for a molecule (such as nitrogen monoxide), it is possible to get an odd number which would make it impossible to satisfy the octet rule for all atoms. D) All of the above statements support why Lewis structures are not a completely accurate way to draw molecules. E) Lewis structures are the most accurate way to draw molecules and are completely correct.

Overall goal: Atomic Structure Chemical Bonding 3D Molecular Structure Molecular Properties

Pages 72 and 73 in Lab Book

Chem 101: Last 5 Weeks Calendar Monday Tuesday Wednesday Thursday Friday 12 13 14 15 16 19 20 21 22 23 26 27 28 29 30 3 4 5 6 7 10 11 Today Back from break Exam 3 101A Final Reading Day

Clicker #2 Draw the Lewis structure for PCl3. What are the geometry, shape, and bond angles of this molecule? Geometry Shape Bond Angles a) Trigonal planar 120° b) Tetrahedral 109.5° c) Trigonal pyramid 107° d) e)

PCl3

Polar vs. Nonpolar Molecules CO2 HCN

Polar vs. Nonpolar Molecules BH3 CH2O

Polar vs. Nonpolar Molecules CH4 CH2F2

Check-In Does H2O have an overall net dipole moment (is it polar overall)? 1) Yes, the electrons are found more towards hydrogen atoms. 2) Yes, the electrons are found more towards the oxygen atom. 3) No, the electron distribution is symmetrical around the central atom.

Check-In Does PCl3 have an overall net dipole moment (is it polar overall)? 1) Yes, the electrons are found more towards chlorine atoms. 2) Yes, the electrons are found more towards the phosphorus. 3) No, the electron distribution is symmetrical around the central atom.

Check-In Does SO3 have an overall net dipole moment (is it polar overall)? 1) Yes, the electrons are found more towards oxygen. 2) Yes, the electrons are found more towards the sulfur. 3) No, the electron distribution is symmetrical around the central atom.

Clicker #3 Draw the Lewis structure for CH4. What are the geometry, shape, bond angles, and polarity of this molecule? Geometry Shape Bond Angles Polar? a) Tetrahedral 109.5° Polar b) Nonpolar c) Trigonal pyramid 107° d)

Clicker #4 Draw the Lewis structure for CH3F. What are the geometry, shape, bond angles, and polarity of this molecule? Geometry Shape Bond Angles Polar? a) Tetrahedral 109.5° Polar b) Nonpolar c) Trigonal pyramid 107° d)