Chapter 9

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Chemistry: A Molecular Approach (Tro)
Chapter 9
Chemical Bonding I: Lewis Theory

1)
Which of the following represent the Lewis structure for N?
A)
[pic]
B)
[pic]
C)
[pic]
D)
[pic]
E)
[pic]
Answer:
A

2)
Which of the following represent the Lewis structure for Cl? A)
[pic]
B)
[pic]
C)
[pic]
D)
[pic]
E)
[pic]
Answer:
B

3)
Which of the following represent the Lewis structure for Mg? A)
[pic]
B)
[pic]
C)
[pic]
D)
[pic]
E)
[pic]
Answer:
C

4)
Which of the following represent the Lewis structure for Br⁻? A)
[pic]
B)
[pic]
C)
[pic]
D)
[pic]
E)
[pic]
Answer:
D

5)
Which of the following represent the Lewis structure for Ca2⁺? A)
[pic]
B)
[pic]
C)
[pic]
D)
[pic]
E)
[pic]
Answer:
E

6)
Which of the following represent the Lewis structure for S2⁻? A)
[pic]
B)
[pic]
C)
[pic]
D)
[pic]
E)
[pic]
Answer:
A

7)
Use Lewis theory to determine the chemical formula for the compound formed between Ca and N. A)
CaN
B)
Ca3N2
C)
CaN2
D)
Ca2N
E)
Ca2N3
Answer:
B

8)
Use Lewis theory to determine the chemical formula for the compound formed between Rb and S. A)
RbS
B)
RbS2
C)
Rb2S
D)
Rb2S3
E)
Rb3S2
Answer:
C

9)
Use Lewis theory to determine the chemical formula for the compound formed between Mg and Br. A)
MgBr
B)
Mg2Br3
C)
Mg3Br2
D)
MgBr2
E)
Mg2Br
Answer:
D

10)
Use Lewis theory to determine the chemical formula for the compound formed between Al and O. A)
Al3O2
B)
Al2O3
C)
AlO2
D)
Al2O
E)
AlO
Answer:
B

11)
Which of the following statements is TRUE?
A)
A covalent bond is formed through the transfer of electrons from one atom to another. B)
A pair of electrons involved in a covalent bond are sometimes referred to as "lone pairs." C)
It is not possible for two atoms to share more than 2 electrons. D)
Single bonds are shorter than double bonds.
E)
A covalent bond has a lower potential energy than the two separate atoms. Answer:
E

12)
Which of the following statements is TRUE?
A)
An ionic bond is much stronger than most covalent bonds.
B)
An ionic bond is formed through the sharing of electrons.
C)
Ionic compounds at room temperature typically conduct electricity. D)
Once dissolved in water, ionic compounds rarely conduct electricity. E)
None of the above are true.
Answer:
A

13)
Which of the following reactions represent the lattice energy of Li2O (ΔH°latt)? A)
Li2O(s) → 2 Li⁺(g) + O2⁻(g)
B)
2 Li⁺(aq) + O2⁻(aq) → Li2O(s)
C)
2 Li⁺(g) + O2⁻(g) → Li2O(s)
D)
Li2O(s) → 2 Li⁺(aq) + O2⁻(aq)
E)
2 Li(s) + [pic] O2(g) → Li2O(s)
Answer:
C

14)
Which of the following reactions represent the lattice energy of CaS (ΔH°latt)? A)
Ca(s) + S(s) → CaS(s)
B)
CaS(s) → Ca(s) + S(s)
C)
Ca2⁺(aq) + S2⁻(aq) → CaS(s)
D)
Ca2⁺(g) + S2⁻(g) → CaS(s)
E)
CaS(s) → Ca2⁺(aq) + S2⁻(aq)
Answer:
D

15)
Which of the following reactions represent the lattice energy of RbI (ΔH°latt)? A)
Rb(s) + [pic]I2(g) → RbI(s)
B)
RbI(s) → Rb⁺(g) + I⁻(g)
C)
RbI(s) → Rb(s) + [pic]I2(g)
D)
RbI(s) → Rb⁺(aq) + I⁻(aq)
E)
Rb⁺(g) + I⁻(g) → RbI(s)
Answer:
E

16)
Place the following in order of...
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