lewis structures and molecular shape
DESCRIPTION
Lewis Structures and Molecular Shape. Lewis Dot Diagrams. Lewis Structures and Quantum Mechanics. Valence bond Theory (Pauling): covalent bonds share e - by overlapping orbitals. Draw an orbital diagram to show the bonding in H 2 O. p . 227 #4 p . 230 #3. Lewis Structures. - PowerPoint PPT PresentationTRANSCRIPT
Lewis Structures and Molecular Shape
Lewis Dot Diagrams
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)
Draw Lewis diagrams of:
SbSr2+
Br-
CS2
NH4+
HPO32-
PCl5
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. 243-245 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)