Presentation on theme: "Lewis Structures and Molecular Shape. Lewis Dot Diagrams."— Presentation transcript:
Lewis Structures and Molecular Shape
Lewis Dot Diagrams
Lewis Structures and Quantum Mechanics Draw an orbital diagram to show the bonding in H 2 O Valence bond Theory (Pauling): covalent bonds share e- by overlapping orbitals p. 227 #4 p. 230 #3 p. 227 #4 p. 230 #3
Lewis Structures Use the summaries on p. 225 and p. 229 to complete: p. 227 #5, p. 229 #10, 11, p. 230 #4,5 p. 229 #12 (extension)
Draw Lewis diagrams of: Sb Sr 2+ Br - CS 2 NH 4 + HPO 3 2- PCl 5
Molecular Shapes and Optical Activity Unpolarized light (normal light) runs in all directions Polarization is confining the vibration of a wave to one direction Polarizer: a filter that only allows light waves in a particular direction to pass Various shapes will absorb and deflect the polarized light in different ways
Molecular Shapes Why do molecules take on these shapes?
Molecular Shape VSEPR Theory valence shell e - pairs repel each other electrostatically so as to minimize repulsive forces lone pairs are bulkier (occupy more space) and repel bonded pairs of e - more strongly Task: Build models of molecules in tables from p in text. Draw 3-D diagrams, write shape name and label bond angles for each molecule.
Homework p. 246 #1-4 p. 249 #10,11 p. 250 #1-3 p. 247 #9 (extension)