57) Which of the following substances contains a nonpolar covalent bond?
A) H2O
B) NaCl
C) NH3
D) MgF2
E) N2
58) Which of the following elements has the lowest electronegativity?
A) Li
B) C
C) N
D) O
E) F
59) Which of the following compounds contains a polar covalent bond?
A) NaF
B) HCl
C) Br2
D) MgO
E) O2
60) Which of the following compounds contains an ionic bond?
A) NH3
B) H2O
C) CaO
D) H2
E) CH4
61) If the electronegativity difference between elements X and Y is 2.1, the bond between the elements X–
Y is
A) ionic.
B) nonpolar ionic.
C) nonpolar covalent.
D) polar covalent.
E) impossible.
62) Ionic bonding is expected in which of these compounds?
A) Cl2
B) KF
C) OF2
D) HF
E) H2
63) A polar covalent bond is found in which of these compounds?
A) H2O
B) F2
C) NaCl
D) H2
E) N2
64) The bond in Cl2 is a(n)
A) ionic bond.
B) nonpolar covalent bond.
C) metallic bond.
D) polar ionic bond.
E) no bond.
65) The VSEPR theory allows us to determine the most favorable
A) shape of a molecule.
B) charge on an ion.
C) color of a compound.
D) bond type for a molecule.
E) formula for a compound.
66) The shape of the carbon tetrachloride molecule is
A) linear.
B) square.
C) pyramidal.
D) tetrahedral.
E) octagonal.
67) The water molecule has a dipole with the negative portion
A) localized between the hydrogen atoms.
B) pointing toward the oxygen atom.
C) localized on one of the hydrogens.
D) pointing from the oxygen through the hydrogen atoms.
E) surrounding the molecule.
68) The shape of the ammonia molecule ( NH3) is
A) linear.
B) square.
C) pyramidal.
D) hexagonal.
E) octagonal.
69) The shape of the carbon dioxide (CO2) is
A) linear.
B) square.
C) pyramidal.
D) hexagonal.
E) bent.
70) The shape of the water molecule ( H2O) is
A) linear.
B) tetrahedral.
C) pyramidal.
D) bent.
E) octagonal.
71) The carbon tetrachloride molecule, CCl4, has the shape of a
A) tetrahedron.
B) square.
C) cube.
D) circle.
E) sphere.
72) Hydrogen sulfide, H2S, has a shape similar to
A) carbon dioxide.
B) carbon monoxide.
C) hydrogen chloride.
D) water.
E) carbon tetrachloride.
73) The carbon tetrachloride molecule, CCl4, is
A) a polar molecule with polar bonds.
B) a nonpolar molecule with polar bonds.
C) a nonpolar molecule with nonpolar bonds.
D) a polar molecule with nonpolar bonds.
E) a polar molecule with ionic bonds.
74) The ammonia molecule ( NH3) is
A) a polar molecule with polar bonds.
B) a nonpolar molecule with polar bonds.
C) a nonpolar molecule with nonpolar bonds.
D) a polar molecule with nonpolar bonds.
E) a polar molecule with ionic bonds.
75) The strongest interactions between molecules of ammonia ( NH3) are
A) ionic bonds.
B) hydrogen bonds.
C) polar covalent.
D) dipole-dipole.
E) dispersion forces.
76) The strongest interactions between molecules of hydrogen ( H2) are
A) ionic bonds.
B) hydrogen bonds.
C) polar covalent.
D) dipole-dipole.
E) dispersion forces.
77) The strongest interactions between molecules of hydrogen chloride are
A) ionic bonds.
B) covalent bonds.
C) hydrogen bonds.
D) dipole-dipole interactions.
E) dispersion forces.
78) The strongest interactions between molecules of iodine I2 are examples of
A) ionic bonds.
B) covalent bonds.
C) hydrogen bonds.
D) dipole-dipole interactions.
E) dispersion forces.
79) The strongest interactions in the compound sodium fluoride, NaF, are examples of
A) ionic bonds.
B) covalent bonds.
C) hydrogen bonds.
D) dipole-dipole interactions.
E) dispersion forces.
80) The strongest interactions between atoms of helium He are examples of
A) ionic bonds.
B) covalent bonds.
C) hydrogen bonds.
D) dipole-dipole interactions.
E) dispersion forces.
6.2 Short Answer Questions
Identify each of the following molecules as polar or nonpolar.
1) carbon tetrachloride
2) water
3) carbon dioxide
4) hydrogen sulfide
5) hydrogen fluoride
6) carbon monoxide
Identify each of the following compounds as covalent or ionic.
7) nitrogen trichloride
8) carbon tetrachloride
9) potassium oxide
10) carbon dioxide
11) sodium fluoride
12) hydrogen sulfide
13) The weakest type of force between particles of a substance is termed ________.
14) Are hydrogen bonds stronger or weaker than covalent bonds?
15) Are dipole-dipole interactions weak or strong compared to ionic bonds?
16) What is the name of Na2S?
17) What is the name of FeCl3?
18) What is the name of SF6?
23
6.3 Matching Questions
Match the correct name of the polyatomic ions with the formulas given.
A) hydrogen sulfate
B) nitrite
C) hydroxide
D) carbonate
E) phosphite
F) sulfate
G) oxide
H) hydrogen carbonate
I) nitrate
J) hydrogen sulfite
K) phosphate
L) carbonite
M) sulfite
1) NO3–
Objective: 6.4
Global Outcomes: GO2
2) CO32-
Objective: 6.4
Global Outcomes: GO2
3) SO42-
Objective: 6.4
Global Outcomes: GO2
4) SO32-
Objective: 6.4
Global Outcomes: GO2
5) PO43-
Objective: 6.4
Global Outcomes: GO2
6) NO2–
Objective: 6.4
Global Outcomes: GO2
7) HCO3–
Objective: 6.4
Global Outcomes: GO2
8) HSO4–
Objective: 6.4
Global Outcomes: GO2
9) OH–
Objective: 6.4
Global Outcomes: GO2
Give the correct charge for ions of the following elements.
A) 1–
B) 2–
C) 1+
D) 0
E) 2+
F) 3+
10) Ca
Objective: 6.1
Global Outcomes: GO2
11) Cl
Objective: 6.1
Global Outcomes: GO2
12) O
Objective: 6.1
Global Outcomes: GO2
13) Al
Objective: 6.1
Global Outcomes: GO2
14) K
Objective: 6.1
Global Outcomes: GO2
Indicate the type of bonding you would expect between the following elements.
A) none
B) polar covalent
C) nonpolar covalent
D) ionic
15) Na and F
Objective: 6.7
Global Outcomes: GO2
16) N and F
Objective: 6.7
Global Outcomes: GO2
17) F and F
Objective: 6.7
Global Outcomes: GO2
18) He and F
Objective: 6.7
Global Outcomes: GO2
19) H and F
Objective: 6.7
Global Outcomes: GO2
Match the chemical name with the correct formula.
A) MgSO3
B) MgSO4
C) MgS
D) Mg(HSO4)2
E) Mg(HSO3)2
20) magnesium sulfate
Objective: 6.4
Global Outcomes: GO2
21) magnesium hydrogen sulfate
Objective: 6.4
Global Outcomes: GO2
22) magnesium sulfide
Objective: 6.4
Global Outcomes: GO2
23) magnesium sulfite
Objective: 6.4
Global Outcomes: GO2
24) magnesium hydrogen sulfite
Objective: 6.4
Global Outcomes: GO2