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Chemistry, 7/e

Raymond Chang, Williams College

Chemical Bonding I: Basic Concepts

Self Assessment B

1

Which one of the following is most likely to form an anion in an ionic compound?

A)

Al

B)

N

C)

O

D)

C

E)

Xe

2

What is the correct number of dots surrounding the Na symbol in the Lewis structure of Na⁺?

A)

0

B)

1

C)

2

D)

6

E)

8

3

Which of the following equations represents the lattice energy of KCl(s)?

A)

Cl₂(g) + 2 K⁺(s) ----> 2 KCl(s)

B)

2 KCl(s) ----> 2 K(s) + 2 Cl^-(g)

C)

KCl(s) ----> K(s) + Cl(g)

D)

KCl(s) ----> K⁺(g) + Cl^-(g)

E)

None of the above.

4

The formula for a compound of Cl that contains both ionic and covalent bonds is:

A)

CCl₄

B)

NaCl

C)

NH₄Cl

D)

PCl₃

E)

CH₃Cl

5

Which of the following has the correct Lewis structure?

A)

H₂O₂: H:O:::O:H

B)

C₂H₂:

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C)

HCN:

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D)

KCl:

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E)

HCl:

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6

Which of the following chemical bonds would be the most polar?

A)

H-O

B)

H-C

C)

N-S

D)

N-Cl

E)

C-O

7

Which of the following is/are correct Lewis structures for C₂H₆?

A)

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B)

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C)

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D)

A and B.

E)

A and C.

8

In which substance shown below does the central atom have the lowest formal charge? Assume that the Lewis structure for each species obeys the octet rule.

A)

NO₃^-

B)

CO₃^2-

C)

SO₃

D)

ClO₃^-

9

When acting as a central atom, which of the following cannot expand its octet?

A)

P

B)

C

C)

Cl

D)

Xe

E)

S

10

Estimate the enthalpy change for the reaction C₂H₆(g) + Cl₂(g) ----> C₂H₅Cl(g) + HCl(g) , given the following bond energies: BE(C-H) = 414 kJ/mol; BE(C-C) = 347 kJ/mol; BE(C-Cl) = 327 kJ/mol; BE(H-Cl) = 431 kJ/mol; BE(Cl-Cl) = 242 kJ/mol.

A)

-113 kJ

B)

-68 kJ

C)

-102 kJ

D)

-344 kJ

E)

276 kJ

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