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1. Why is NH3 classified as a polar molecule?
A.
?
Nitrogen and hydrogen are both nonmetals.
B.
?
NH3 molecules have asymmetrical charge distributions.
C.
?
It is a gas at room temperature and pressure.
D.
?
N-H bonds are non-polar.
2. IBr3 molecules are ____.
A.
?
either
B.
?
nonpolar
C.
?
polar
3. Which represents a polar molecule?
A.
?
CH4
B.
?
None of these.
C.
?
F2
D.
?
SO3
E.
?
CO2
4. Which statement best explains why carbon tetrachloride (CCl4) is non-polar?
A.
?
The carbon tetrachloride molecule is symmetrical.
B.
?
Each carbon-chloride bond is polar.
C.
?
Carbon and chlorine are both nonmetals.
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D.
?
Carbon tetrachloride is an organic compound.
5. Which one of the following is a polar molecule?
A.
?
CCl4
B.
?
CO2
C.
?
CH3Cl
D.
?
CH4
6. SO3 molecules are ____.
A.
?
polar
B.
?
either
C.
?
nonpolar
7. A polar molecule is one in which there is a separation of charge caused by ___.
A.
?
a complete loss of electrons
B.
?
an uneven number of electron pairs
C.
?
a non-uniform electron distribution
D.
?
an average distribution of electrons
8. XeF4 molecules are ____.
A.
?
either
B.
?
nonpolar
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C.
?
polar
9. Identify the formula which represents a non-polar molecule.
A.
?
H2S
B.
?
Al2S3
C.
?
HCl
D.
?
NH3
E.
?
CF4
10. Which of the following molecule is not polar?
A.
?
H2
B.
?
ammonia (NH3)
C.
?
water (H2O)
D.
?
HF
11. As compared with the dipole moment of CH4, we would predict that of CCl4 to be
(electronegativities: H = 2.1; C = 2.4; Cl = 3.0) __________.
A.
?
greater because of the much higher boiling point of CCl4
B.
?
less because of the larger size of the chlorine atom
C.
?
greater because the C-Cl bond is more polar than the C-H bond
D.
?
essentially the same because of molecular symmetry
E.
?
greater because of the greater molecular mass of CCl4
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12. Which is an example of a non-polar molecule that contains polar covalent bonds?
A.
?
CBr4
B.
?
None of these.
C.
?
NH3
D.
?
N2
E.
?
H2O
13. H2S molecules are ____.
A.
?
polar
B.
?
nonpolar
C.
?
either
14. Which of the following molecules are non-polar?
A.
?
CO2 and CH4
B.
?
CO and CH4
C.
?
CO and CO2
D.
?
CH4 and H2O
E.
?
H2O and CO
15. What does it mean when a molecule is said to be polar?
A.
B.
? One end of the molecule is slightly negative while the other end is
slightly positive.
?
Both ends of the molecular are slightly positive.
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C.
?
Both ends of the molecule are slightly negative.
D.
?
The molecule is neutral
E.
?
The difference in electronegativities is zero.
16. Which of the following molecules dissolves in water?
A.
?
CBr4
B.
?
CH3OH
C.
?
C6H6
D.
?
CCl4
17. BF3 molecule is ____.
A.
?
either
B.
?
polar
C.
?
nonpolar