Lewis Structures and Quantum Mechanics
Draw an orbital diagram to show the bonding in
H2O
Valence bond Theory (Pauling): covalent bonds share e- by
overlapping orbitals
p. 227 #4p. 230 #3
Lewis Structures
• Use the summaries on p. 225 and p. 229 to complete:p. 227 #5, p. 229 #10, 11, p. 230 #4,5p. 229 #12 (extension)
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 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. 243-245 in text. Draw 3-D diagrams, write shape name and label bond angles for each molecule.