Question 1

Which of the following would have to lose three electrons in order to achieve a noble gas electron configuration? Si Mg Al Cl P

Accepted Answer

A)  Si, P
B)  Al
C)  P
D)  Cl
E)  Mg, Al, PF) A) and D)
G) A) and C)

Question 2

The diagram below is the Born-Huber cycle for the formation of crystalline potassium fluoride. 
-Which energy change corresponds to the electron affinity of fluorine?

Accepted Answer

A)  2
B)  5
C)  4
D)  1
E)  6F) None of the above
G) D) and E)

Question 3

The electron configuration [Kr]4d10 represents ________.

Accepted Answer

A)  Ag+
B)  Cd
C)  Cd+
D)  Ag2+
E)  Sr2+F) A) and E)
G) C) and D)

Question 4

The central atom in ________ does not violate the octet rule.

Accepted Answer

A)  SF4
B)  KrF2
C)  CF4
D)  XeF4
E)  ICl4-F) B) and E)
G) D) and E)

Question 5

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, SeF) B) and E)
G) C) and E)

Question 6

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 7

Bond enthalpy is ________.

Accepted Answer

A)  always positive
B)  always negative
C)  sometimes positive, sometimes negative
D)  always zero
E)  unpredictableF) B) and C)
G) B) and D)

Question 8

Most transition metals do not form ions with a noble gas configuration.

Accepted Answer

A) True 
 B)False

Question 9

Electropositivity ________ from left to right within a period and ________ from top to bottom within a group.

Accepted Answer

A)  decreases, increases
B)  increases, increases
C)  increases, decreases
D)  stays the same, increases
E)  increases, stays the sameF) B) and C)
G) C) and D)

Question 10

Of the possible bonds between carbon atoms (single, double, and triple) , ________.

Accepted Answer

A)  a triple bond is longer than a single bond
B)  a double bond is stronger than a triple bond
C)  a single bond is stronger than a triple bond
D)  a double bond is longer than a triple bond
E)  a single bond is stronger than a double bondF) B) and E)
G) A) and D)

Question 11

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)  -38F) B) and E)
G) C) and D)

Question 12

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

Accepted Answer

A)  ClF3
B)  PCl3
C)  SO3
D)  CCl4
E)  CO2F) A) and B)
G) A) and E)

Question 13

Which of the following does not have eight valence electrons?

Accepted Answer

A)  Ca+
B)  Rb+
C)  Xe
D)  Br-
E)  All of the above have eight valence electrons.F) A) and B)
G) A) and E)

Question 14

A nonpolar bond will form between two ________ atoms of ________ electronegativity.

Accepted Answer

A)  different, opposite
B)  identical, different
C)  different, different
D)  similar, different
E)  identical, equalF) A) and B)
G) A) and C)

Question 15

Which two bonds are most similar in polarity?

Accepted Answer

A)  O-F and Cl-F
B)  B-F and Cl-F
C)  Al-Cl and I-Br
D)  I-Br and Si-Cl
E)  C-Cl and Be-ClF) A) and E)
G) All of the above

Question 16

The central atom in ________ violates the octet rule.

Accepted Answer

A)  PF5
B)  SF2
C)  Cl2
D)  Br2CO
E)  FCNF) A) and B)
G) B) and D)

Question 17

Bond enthalpy can be positive or negative.

Accepted Answer

A) True 
 B)False

Question 18

For a given arrangement of ions, the lattice energy increases as ionic radius ________ and as ionic charge ________.

Accepted Answer

A)  decreases, increases
B)  increases, decreases
C)  increases, increases
D)  decreases, decreases
E)  This cannot be predicted.F) B) and C)
G) C) and D)

Question 19

Using the table of average bond energies below, the △H for the reaction is ________ kJ. C≡O (g)  + 2H2 (g)  → H3C-O-H (g) 
Bond: C-O C=O C≡O C-H H-H O-H
D (kJ/mol) : 358 799 1072 413 436 463

Accepted Answer

A)  +276
B)  -276
C)  +735
D)  -735
E)  -116F) None of the above
G) A) and B)

Question 20

The diagram below is the Born-Huber cycle for the formation of crystalline potassium fluoride. 
-Which energy change corresponds to the first ionization energy of potassium?

Accepted Answer

A)  2
B)  5
C)  4
D)  3
E)  6F) D) and E)
G) A) and E)

Exam 8: Basic Concepts of Chemical Bonding

Bond enthalpy 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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A valid Lewis structure of ________ cannot be drawn without violating the octet rule.

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The electron configuration [Kr]4d10 represents ________.

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A nonpolar bond will form between two ________ atoms of ________ electronegativity.

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For a given arrangement of ions, the lattice energy increases as ionic radius ________ and as ionic charge ________.

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The diagram below is the Born-Huber cycle for the formation of crystalline potassium fluoride. -Which energy change corresponds to the first ionization energy of potassium?

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Using the table of average bond energies below, the △H for the reaction is ________ kJ. C≡O (g) + 2H2 (g) → H3C-O-H (g) Bond: C-O C=O C≡O C-H H-H O-H D (kJ/mol) : 358 799 1072 413 436 463

Correct AnswerverifiedShow Answer

The diagram below is the Born-Huber cycle for the formation of crystalline potassium fluoride. -Which energy change corresponds to the electron affinity of fluorine?

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Bond enthalpy can be positive or negative.

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Of the possible bonds between carbon atoms (single, double, and triple) , ________.

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Electropositivity ________ from left to right within a period and ________ from top to bottom within a group.

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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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The central atom in ________ does not violate the octet rule.

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The central atom in ________ violates the octet rule.

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Which of the following does not have eight valence electrons?

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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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Most transition metals do not form ions with a noble gas configuration.

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Which two bonds are most similar in polarity?

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Which of the following would have to lose three electrons in order to achieve a noble gas electron configuration? Si Mg Al Cl P

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

Correct Answer
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The electron configuration [Kr]4d¹⁰ represents ________.

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A nonpolar bond will form between two atoms of electronegativity.

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For a given arrangement of ions, the lattice energy increases as ionic radius and as ionic charge .

Correct Answer
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Using the table of average bond energies below, the △H for the reaction is ________ kJ. C≡O (g) + 2H₂ (g) → H₃C-O-H (g) Bond: C-O C=O C≡O C-H H-H O-H D (kJ/mol) : 358 799 1072 413 436 463

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Electropositivity from left to right within a period and from top to bottom within a group.

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