Question 1

Based on the octet rule, magnesium most likely forms a __________ ion.

Accepted Answer

A)  Mg2+
B)  Mg2-
C)  Mg6-
D)  Mg6+
E)  Mg-

Question 2

Using the table of bond dissociation energies, the ΔH for the following gas-phase reaction is __________ kJ.

Accepted Answer

A)  291
B)  2017
C)  -57
D)  -356
E)  -291

Question 3

The oxidation number of phosphorus in PF3 is __________.

Accepted Answer

A)  -2
B)  +1
C)  +3
D)  +2
E)  -3

Question 4

Using the table of bond dissociation energies, the ΔH for the following gas-phase reaction is __________ kJ.

Accepted Answer

A)  -44
B)  38
C)  304
D)  2134
E)  -38

Question 5

A valid Lewis structure of __________ cannot be drawn without violating the octet rule.

Accepted Answer

A)  NI3
B)  SO2
C)  ICl5
D)  SiF4
E)  CO2

Question 6

Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br

Accepted Answer

A)  Br
B)  Sr
C)  Na
D)  O, Se
E)  Sr, O, Se

Question 7

To produce maximum heat, an explosive compound should have __________ chemical bonds and decompose to molecule with __________ bonds.

Accepted Answer

The answer of To produce maximum heat, an explosive compound...

Question 8

Which halogen, bromine or iodine, will form the more polar bond with phosphorus?

Accepted Answer

The answer of Which halogen, bromine or iodine, will form...

Question 9

The formal charge on sulfur in SO42- is __________, where the Lewis structure of the ion is: 42- is __________, where the Lewis structure of the ion is:   A) -2 B) 0 C) +2 D) +4 E) -4" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  -2
B)  0
C)  +2
D)  +4
E)  -4

Question 10

There are __________ unpaired electrons in the Lewis symbol for a (an) sodium ion.

Accepted Answer

A)  3
B)  2
C)  0
D)  4
E)  1

Question 11

Of the bonds C-N, C-N, and C≡N, the C-N bond is __________.

Accepted Answer

A)  strongest/shortest
B)  strongest/longest
C)  weakest/shortest
D)  weakest/longest
E)  intermediate in both strength and length

Question 12

For resonance forms of a molecule or ion, __________.

Accepted Answer

A)  one always corresponds to the observed structure
B)  all the resonance structures are observed in various proportions
C)  the observed structure is an average of the resonance forms
D)  the same atoms need not be bonded to each other in all resonance forms
E)  there cannot be more than two resonance structures for a given species

Question 13

The Lewis structure of N2H2 shows __________.

Accepted Answer

A)  a nitrogen-nitrogen triple bond
B)  a nitrogen-nitrogen single bond
C)  each nitrogen has one nonbonding electron pair
D)  each nitrogen has two nonbonding electron pairs
E)  each hydrogen has one nonbonding electron pair

Question 14

What is the electron configuration for the Fe2+ ion?

Accepted Answer

A)  [Ar]4s03d6
B)  [Ar]4s23d4
C)  [Ar]4s03d8
D)  [Ar]4s23d8
E)  [Ar]4s63d2

Question 15

Of the bonds C-C, C-C, and C≡C, the C-C bond is __________.

Accepted Answer

A)  strongest/shortest
B)  strongest/longest
C)  weakest/longest
D)  weakest/shortest
E)  intermediate in both strength and length

Question 16

In the Lewis structure of HCO3-, the formal charge on H is __________ and the formal charge on C is __________.

Accepted Answer

A)  -1, -1
B)  0, 0
C)  0, -1
D)  +1, -1
E)  -1, +1

Question 17

Using the table of average bond energies below, the ΔH for the reaction is __________ kJ.  Bond: C≡C C-C H-I C-I C-H D (kJ/mol) : 839 348 299 240 413

Accepted Answer

A)  +160
B)  -160
C)  -217
D)  -63
E)  +63

Question 18

In the Lewis structure of ClF, the formal charge on Cl is __________ and the formal charge on F is __________.

Accepted Answer

A)  -1, -1
B)  0, 0
C)  0, -1
D)  +1, -1
E)  -1, +1

Question 19

Of the bonds below, __________ is the least polar.

Accepted Answer

A)  C, O
B)  N, O
C)  C, F
D)  S, O
E)  K, Br

Question 20

Given the electronegativities below, which covalent single bond is most polar? Element: H C N O
Electronegativity: 2.1 2.5 3.0 3.5

Accepted Answer

A)  C-H
B)  N-H
C)  O-H
D)  O-C
E)  O-N

Exam 8: Basic Concepts of Chemical Bonding

The formal charge on sulfur in SO42- is __________, where the Lewis structure of the ion is:

Correct AnswerverifiedShow Answer

To produce maximum heat, an explosive compound should have __________ chemical bonds and decompose to molecule with __________ bonds.

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Using the table of bond dissociation energies, the ΔH for the following gas-phase reaction is __________ kJ.

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Of the bonds C-N, C-N, and C≡N, the C-N bond is __________.

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Which of the following would have to gain two electrons in order to achieve a noble gas electron configuration? O Sr Na Se Br

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There are __________ unpaired electrons in the Lewis symbol for a (an) sodium ion.

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Using the table of bond dissociation energies, the ΔH for the following gas-phase reaction is __________ kJ.

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In the Lewis structure of ClF, the formal charge on Cl is __________ and the formal charge on F is __________.

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The oxidation number of phosphorus in PF3 is __________.

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What is the electron configuration for the Fe2+ ion?

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A valid Lewis structure of __________ cannot be drawn without violating the octet rule.

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Of the bonds below, __________ is the least polar.

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In the Lewis structure of HCO3-, the formal charge on H is __________ and the formal charge on C is __________.

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Of the bonds C-C, C-C, and C≡C, the C-C bond is __________.

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Given the electronegativities below, which covalent single bond is most polar? Element: H C N O Electronegativity: 2.1 2.5 3.0 3.5

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For resonance forms of a molecule or ion, __________.

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Which halogen, bromine or iodine, will form the more polar bond with phosphorus?

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Based on the octet rule, magnesium most likely forms a __________ ion.

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The Lewis structure of N2H2 shows __________.

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Using the table of average bond energies below, the ΔH for the reaction is __________ kJ. Bond: C≡C C-C H-I C-I C-H D (kJ/mol) : 839 348 299 240 413

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The formal charge on sulfur in SO₄^2- is __________, where the Lewis structure of the ion is:

Correct Answer
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To produce maximum heat, an explosive compound should have chemical bonds and decompose to molecule with bonds.

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In the Lewis structure of ClF, the formal charge on Cl is and the formal charge on F is .

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The oxidation number of phosphorus in PF₃ is __________.

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What is the electron configuration for the Fe²⁺ ion?

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In the Lewis structure of HCO₃^-, the formal charge on H is and the formal charge on C is .

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The Lewis structure of N₂H₂ shows __________.

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