CHM 1045 Study Guide - Final Guide: Lewis Structure, Vsepr Theory, Chemical Polarity
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Lewis structures for structural formula: write lewis symbols for atoms. You may need to review valence electrons for a neutral atom from chapter 4: use formal charges to identify the dominant lewis structure for a molecule or ion. Molecular shape for ball-and-stick or space-filling models: note: cannot determine shape from chemical formula without drawing a good lewis structure. 1st: be able to describe the 3d shapes of molecules using the vsepr model, including: Identify interior atoms (those bonded to two or more other atoms) Identify atoms involved in the bond angle (should always be three atoms) Identify geometries and bond angles when there are multiple interior atoms (see. Identify bond angles for each shape (both basics and with lone pairs: you will need to know the names of the different geometries. Identify polar bonds (chapter 6 section 2: determine whether or not bond dipoles will cancel (see table 6. 6) Identify molecular geometry: draw net dipole for a molecule.
