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As always… OWL Lon-Capa assignments Lecture videos Textbook Read Do text homework

Clicker Question Which of the following is the best Lewis structure for the hydrogen thiocyanate molecule (HSCN) taking formal charge into account? Note: the lone pairs are not included in these skeletal structures. Before answering the question, complete the Lewis structures. a) H-S-C≡N b) H-S=C=N c) H-S≡C-N d) H-S-C-N e) At least two of the above structures are equally valid when considering formal charge.

Chapter 13

VSEPR – General Guidelines Draw the Lewis structure. If the octet rule is exceeded, add electrons to the central atom. Multiple bonds count as one direction (or one “effective pair”). Consider the lone pairs when determining the geometry. Consider only the atoms when determining the shape. Polarity comes from asymmetry.

VSEPR Model

Clicker Question How many of the following molecules can correctly be described as “bent”? O3 H2S SeO2 CO2 XeCl2 a) 1 d) 4 b) 2 e) 5 c) 3