Class
Date
Name
POLAR MOLECULES
Write the letter of the term or phrase that completes the statement or answers the question.
___
1. A bond in which there is an unequal attraction for the shared pair of electrons resulting in an
unequal distribution of charge is a(n) __ .
a. ionic bond
c. polar covalent bond
b. metallic bond
d. nonpolar covalent bond
2. Which of the following covalent bonds would be the most polar?
a. H-C
___
b. H-N
c. H-CI
d. H-O
3. As the dipole moment increases, the strength of the forces between the molecules --'
a. varies at random
b. increases
c. decreases
d. remains constant
4. Weak forces that may hold molecules to each other are termed --'
a. covalent bonds
b. van der Waals forces
c. coordinate covalent bonds
d. resultant forces
5. The particles held together by intramolecular forces would be __ .
a. atoms
b. molecules
c. ions
d. protons
6. A nonpolar molecule that has had its electron cloud distorted due to the proximity of a polar
molecule is called a(n) __ .
a. dipole
b. complex ion
c. isomer
d. induced dipole
7. The polar molecule or anion that is bonded to the central positive ion in a complex ion is called
a(n) _.
,----".
a. polyatomic ion
___
b. dipole
c. isomer
d. ligand
8. The shape of complex ions with a coordination number of two is __ .
a. linear
b. tetrahedral
c. octahedral
d. square-planar
9. What is the name of the following complex ion: [Ag(NHa)2J +?
a. amminesilver ion
b. silver diamminate
___
c. diamminesilver(I) ion
d. diamminesilverate
10. A bond in which both of the electrons in the shared pair come from the same atom is called a(n)
a. ionic bond
b. coordinate covalent bond
c. induced dipole
d. hydrogen bond
___
11. Which of the following explains why transition metals tend to form stable complex ions?
a. Transition metals have a positive oxidation number.
b. Transition metals have a high charge density when they form ions.
c. Transition metals have electrons in at least three energy levels.
d. The number of neutrons exceeds the number of protons in the nucleus.
___
12. In chromatography, the mixture to be separated plus the liquid or gas in which it is dissolved is
known as the __ .
a. substrate
b. filtrate
c. dispersion medium d. mobile phase
___
13. The overall separation of parts from
a whole by any process is called --'
b. precipitation
c. segmentation
d. allocation
a. fractionation
CHAPTER 14
EVALUATION MASTER
Merrill Publishing Company, © 1990, 1987
Users of
Chemistry: A Modern Course have the publisher's
permi~sion
to reproduce
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349
---
14. The most common coordination
a.
---
b.
2
4
number found in complex ions is __ .
c. 6
d.
15. A convenient method for the separation of substances based on their polarity and adsorption is
called _.
a. distillation
b. fractional crystallization
---
8
c. chromatography
d. filtration
16. Which of the following is a separation technique used to analyze volatile liquids by employing
an inert gas as the mobile phase?
a. column chromatography
b. paper chromatography
c. thin layer chromatography
d. gas chromatography
---
17. An unequal distribution
-_
18. Which of the following is the correct formula for the tetraamminedichlorocobalt(lII)
of charge that results from the random asymmetric distribution of electrons in a nonpolar bond forms a(n) __ .
a. induced dipole
b. complex ion
c. polyatomic ion
~. temporary dipole
a. [Co(NH3)4C12]+
__
b. Co(NH3)4C12
c. [Co(NH3)2Cl]+
ion?
d. [Co(NH4)C12]+
c. Si-O
d. N-O
19. Which of the following bonds is the least polar?
a.
c-o
b. O-Cl
---
20. Among molecules
of comparable molecular mass, as the dipole moment increases the boiling
point of the substance __ .
a. varies at random
b. increases
c. decreases
d. stays the same
---
21. Dipole-dipole forces, dipole-induced
to __ .
a. complex ion formation
c. intramolecular forces
dipole forces, and dispersion forces collectively contribute
c. van der Waals forces
d. London forces
22. What is formed when polar molecules
a. polyatomic ion
or negative ions cluster around a central positive ion?
b. covalent bond
c. dipole
d. complex ion
---
23. What is the coordination number of a complex ion having a tetrahedral shape?
a. 2
b. 3
c. 4
d. 6
---
24. What type of chromatography
___
25. What is the name of the following complex ion: AlF63-?
might utilize substances such as sodium carbonate, activated charcoal, or ion exchange resins as the stationary phase?
a. paper chromatography
c. thin layer chromatography
b. column chromatography
d. gas chromatography
a. aluminum hexafluoride ion
b. trifluoroaluminate(VI) ion
c. aluminum hexafluoridate ion
d. hexafluoroaluminate
ion
___
26. All of the following molecules exhibit dipole-dipole forces except __ .
a. S02
b. ICI
c. H20
d. CH4
___
27. Ligands can be either molecules or __ .
a. neutral atoms
__
___
350
28. What is the coordination
a. 2
b. negative ions
c. positive ions
d. ions of either charge
c. 6
d.
number of Pt(NH3)42-?
b.
4
8
29. Which of the following types of ion creates a complex ion of the greatest stability?
a. small ion of high charge
c. large ion of high charge
b. small ion of small charge
d. large ion of small charge
Merrill
Users of Chemistry:
A Modern
Publishing
Company,
CHAPTER 14
© 1990, 1987
Course have the publisher's
permission
to reproduce
this page.
EVALUATION MASTER