pg 275 #117-123

117. (use electronegativity values found in textbook, found on pg 194)          a) C-O  b) C-F   c) P-Cl

118. a) C  b)N  c) S d) O

119. b) Si-O

120. In order of increasing polarity: c, a, b, e, d

121. equal distribution of charge because of symmetry

122.  a) Polar, asymmetrical   b) nonpolar, symmetrical  c)polar, asymmetrical  d)nonpolar, symmetrical

123. sulfur difluoride and sulfur tetrafluoride are polar. Sulfur hexafluoride is nonpolar (draw Lewis, check for symmetry, check for polarity)