AP Chemistry - Worksheet #6
Polarity Worksheet
1. Would we expect the molecule PCl3 to be polar or nonpolar?
 
2. Would you expect the molecule SO3 to be polar or nonpolar?
 
3. Would you expect the molecule HCN to be polar or nonpolar? 
 
4. Which of the following molecules would be expected to be polar?

a)   SF6,       b)   SO2,       c)   BrCl,     d)   AsH3,        e)   CF2Cl2
 
5. Why is it useful to know the polarities of molecules? 
 
6. How do we indicate a bond dipole when we draw the structure of a molecule?
 
7. What condition must be met if a molecule having polar bonds is to be nonpolar? 
 
8. Suppose that water molecules were found to be linear, that is, the H-O-H angle is 180o. Would you expect water to be a polar molecule?
 
9. How would you account for the fact that ethane CH3CH3 is a gas (b.p. -88oC) whereas hydrazine N2H4 is a liquid (b.p. 113.5oC)? 
 
10. Arrange the following molecules in order of probable increasing polarity;

a) IBr,   b) HI,   c) I2
 
11. Arrange the following sets of compounds in order of decreasing boiling points (highest boiling point to lowest boiling point). 

a) 
 

b) 
 

c) 
 

d) 
 

e) 
 
12. From the following, select those that contain polar covalent bonds, and, for these, indicate the location of the partial positive and negative charges: 

a)  SO2,     b)  H2S,     c)  N2,      d)  CO2,      e)  OF2,     f)  HOCl, 
 

g)  O3,      h)  NI3,      i)  S8,      j)  P4,      k)  HCN,      l)  HF, 
 

m)  HNO3,      n)  S2
 
13.  Although CsF is probably the most ionic of the alkali metal fluorides, it has the lowest m.p. Why?