Estimate DH for the following reactions and indicate whether they are exothermic or endothermic
  1. 08_07_Figure_LFor each pair, circle the most polar bond
    1. C—F                 O—F                
image 6
Estimate DH for the following reactions and indicate whether they are exothermic or endothermic 16
image 5
Estimate DH for the following reactions and indicate whether they are exothermic or endothermic 17
08_07_Figure_L
  • O—Cl               S—Br               
  • C—S                 B—F                
  • C—P                 N—F
  • N—O                C—O
  •   By referring only to the periodic table, select most electronegative element in each pair
    • Al         or         Si
    • F          or         N
    • Ga        or         P
    • Na        or         K
    • Br         or         Pb
  • Write Lewis structures that obey the octet rule for each of the following, and assign formal charges to each atom
    • CF4
  • BrO3
  • Write Lewis structures for the following

H2CO (both H atoms are bonded to C)                                                    NF3

AsO33-                                                                           C2H2

O3                                                                                 NO

BF3                                                                               XeF4

  • Write the Lewis Structures for the following molecules.  Based on Lewis structures, predict which molecule will have the longest N—O bond lengths: NO+, NO2, and NO3.
  • OCS, has three possible Lewis structures. (a) Draw these three structures and assign formal charges in each. (b) Which Lewis structure is dominant?  Treat C as the central atom in each of the three Lewis structures

O      C      S                   O     C     S                     O     C     S

  • Using Table 8.4, estimate DH for the following reactions and indicate whether they are exothermic or endothermic
  1.             
  •                 
image 4
Estimate DH for the following reactions and indicate whether they are exothermic or endothermic 18
08_04_Table_L
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