Question 10.5: Determine if NH3 is polar.
Determine if NH_{3} is polar.
| Draw the Lewis structure for the molecule and determine its molecular geometry. | 
The Lewis structure has three bonding groups and one lone pair about the central atom. Therefore the molecular geometry is trigonal pyramidal. |
| Determine if the molecule contains polar bonds. Sketch the molecule and superimpose a vector for each polar bond. The relative length of each vector should be pro-portional to the electronegativity difference between the atoms forming each bond. The vector should point in the direction of the more electronegative atom. | The electronegativities of nitrogen and hydrogen are 3.0 and 2.1, respectively. Therefore the bonds are polar.
|
| Determine if the polar bonds add together to form a net dipole moment. Examine the symmetry of the vectors (representing dipole moments) and determine if they cancel each other or sum to a net dipole moment. | The three dipole moments sum to a net dipole moment. The molecule is polar.
|
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