Explain the direction and relative sizes of the dipole moments ...

[cartlidgeashley]

Explain the direction and relative sizes of the dipole moments for NH3 ( = 1 46 . D ) and NF3 ( = 0 24 . D).

Question 2

All of the NO bonds in nitrate ion (NO3) are identical. Draw structures and explain

Question 3

Draw a resonance structure for
 

Question 4

Draw another resonance structure for
 

Question 5

Draw a Lewis structure for HNO2 (an oxyacid that is not a peroxide)

Question 6

Draw a Lewis structure for hydroxylammonium ion: +NH3OH.

Question 7

Draw a valid Lewis structure for PO43 and show the formal charges on each atom. (Hint: There are no
  OO bonds.)

Question 8

Draw a valid Lewis structure for CH2N2 and show the formal charges on each atom. (Hint: Both H atoms
  are connected to C, and the N atoms are connected to each other.)

Question 9

Give the geometry for each carbon atom (left to right).
 
 

a. tetrahedral, trigonal planar
  b. trigonal planar, tetrahedral
  c. trigonal planar, linear
  d. tetrahedral, linear
  e. linear, trigonal planar

Question 10

Which geometry of the carbon atom does not match the corresponding structure?
 

Question 11

Which structural isomer of CH3NO is most stable?
 

Question 12

Which is the best Lewis structure for C2H4O?
 

[Jmfn03]

Answer to Question 1

In NH3, the dipole moment is toward the more electronegative nitrogen, and toward the lone pair. In
NF3 the dipoles of the NF bonds are directed toward the more electronegative fluorine, and away from the
lone pair, so the resultant dipole moment is much smaller and away from the lone pair.

Answer to Question 2

All of the bonds between N and O are equivalent. Each bond is really approximately 1 1/3 bond since
there are three resonance structures and each of the NO bonds is a double bond in one of the three
structures.

Answer to Question 3



Answer to Question 4



Answer to Question 5



Answer to Question 6



Answer to Question 7



Answer to Question 8



Answer to Question 9

a

Answer to Question 10

d

Answer to Question 11

b

Answer to Question 12

c

Answer to Question 13



Answer to Question 14

c

Answer to Question 15

a

Answer to Question 16

a

Answer to Question 17

c

Answer to Question 18

c