To Do… OWL Lectures Discussion

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To Do… OWL Lectures Discussion Chapter 12 (Part 2) due Friday, April 20 Chapter 14 due Tuesday, April 24 Lectures Begin reading Chapter 14 Discussion Chapter 14 text homework

Exam 3 Thursday, April 26, 7:00 pm–8:30 pm; Rooms on the website (same). Conflict: April 26; 5:00 pm – 6:30 pm in 1022 Lincoln Hall; sign up in 1026 CA Practice exam will be posted online. See me right away if you have a conflict with the exam and conflict times.

Lewis Structures Determine the total number of valence electrons in the molecule. Form at least one bond between atoms in the molecule (a pair of electrons is a bond) Arrange the rest of the electrons (in pairs) to satisfy the octet rule or duet rule (for hydrogen). Watch for exceptions.

Clicker Question Which of the following has a Lewis structure most like that of the nitrate ion? a) the carbonate ion b) the sulfate ion c) ozone (O3) d) nitrogen monoxide e) I am not sure.

VSEPR – General Rules 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.

Table 12-4 p295

See pages 63-64 in your lab book

See pages 63-64 in your lab book