Question 1

What is the ground-state electron configuration of Ni2+?

Accepted Answer

A) [Ar]3d64s2 
B) [Ar]3d74s2 
C) [Ar]3d74s1 
D) [Ar]3d64s1 
E) [Ar]3d8 
A) [Ar]3d64s2 
B) [Ar]3d74s2 
C) [Ar]3d74s1 
D) [Ar]3d64s1 
E) [Ar]3d8

Question 2

In which of the following lists do the ions not appear in order of increasing ionic radius?

Accepted Answer

A) S2- - + 
B) Na+ - 2- 
C) Cl- - - 
D) Li+ + + 
E) Al3+ 2+ + 
A) S2- - + 
B) Na+ - 2- 
C) Cl- - - 
D) Li+ + + 
E) Al3+ 2+ +

Question 3

In the Born-Haber cycle for NaCl(s),which of the following processes corresponds to the enthalpy of formation of NaCl(s)?

Accepted Answer

A) Na(s)+   Cl2(g)→ NaCl(s) 
B) Na+(aq)+   (aq)→ NaCl(s) 
C) NaCl(g)→ NaCl(s) 
D) 2Na(g)+ Cl2(g)→ 2NaCl(g) 
E) NaCl(aq)→ NaCl(s) 
A) Na(s)+   Cl2(g)→ NaCl(s) 
B) Na+(aq)+   (aq)→ NaCl(s) 
C) NaCl(g)→ NaCl(s) 
D) 2Na(g)+ Cl2(g)→ 2NaCl(g) 
E) NaCl(aq)→ NaCl(s)

Question 4

The total number of valence electrons in the tetrathionate ion,S4O62-,is

Accepted Answer

A) 58. 
B) 60. 
C) 56. 
D) 54. 
E) 62. 
A) 58. 
B) 60. 
C) 56. 
D) 54. 
E) 62.

Question 5

Which of the following are two appropriate resonance formulas for the acetate ion,CH3CO2-?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 6

The formation of which monatomic ion of oxygen is the most energetically favorable?

Accepted Answer

A) O4+ 
B) O2- 
C) O- 
D) O6+ 
E) O2+ 
A) O4+ 
B) O2- 
C) O- 
D) O6+ 
E) O2+

Question 7

The formulas of many binary covalent compounds can be predicted on the basis

Accepted Answer

A) that a bond is formed by the overlapping of two filled orbitals. 
B) that the number of bonds an atom can have is equal to the number of empty valence orbitals it has. 
C) that a bond is formed by the overlapping of atomic orbitals. 
D) that the number of bonds an atom can have is equal to the number of half-filled valence orbitals it can have. 
E) that bonding electrons are simultaneously attracted by more than one nucleus. 
A) that a bond is formed by the overlapping of two filled orbitals. 
B) that the number of bonds an atom can have is equal to the number of empty valence orbitals it has. 
C) that a bond is formed by the overlapping of atomic orbitals. 
D) that the number of bonds an atom can have is equal to the number of half-filled valence orbitals it can have. 
E) that bonding electrons are simultaneously attracted by more than one nucleus.

Question 8

In which pair do both compounds exhibit predominantly ionic bonding?

Accepted Answer

A) RbCl and CaO 
B) PCl5 and HF 
C) KI and O3 
D) Na2SO3 and BH3 
E) NaF and H2O 
A) RbCl and CaO 
B) PCl5 and HF 
C) KI and O3 
D) Na2SO3 and BH3 
E) NaF and H2O

Question 9

What is the electron configuration for ? Mn3+

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 10

In the Lewis formula for ClF3,how many lone pairs are around the central atom?

Accepted Answer

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

Question 11

What is the total number of valence electrons in the cyanate ion,CNO- ion,?

Accepted Answer

A) 20 
B) 12 
C) 16 
D) 22 
E) 18 
A) 20 
B) 12 
C) 16 
D) 22 
E) 18

Question 12

What is the ground-state electron configuration of the phosphide ion?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 13

Using bond-energy data,what is ΔH° for the following reaction?
CH4(g)+ 2F2(g)→ CF4(g)+ 2H2(g)
Bond
Bond Energy (kJ/mol)
C-H
413
H-H
432
F-F
159
C-F
485

Accepted Answer

A) -834 kJ 
B) 561 kJ 
C) 834 kJ 
D) 1489 kJ 
E) -561 kJ 
A) -834 kJ 
B) 561 kJ 
C) 834 kJ 
D) 1489 kJ 
E) -561 kJ

Question 14

In the Lewis formula that minimizes formal charge,what is the formal charge on the sulfur atom in sulfur trioxide,SO3?

Accepted Answer

A) +2 
B) +4 
C) +6 
D) -2 
E) 0 
A) +2 
B) +4 
C) +6 
D) -2 
E) 0

Question 15

Which of the following statements is true concerning the Lewis formula that minimizes formal charge for H2SO4?

Accepted Answer

A) The formal charge of S is +2,the formal charge of each O is 0,and the formal charge H is 0. 
B) The formal charge of S is +2,the formal charge of O is either 0 or -2,and the formal charge of H is +1. 
C) The formal charge of S is +2,the formal charge of O is either 0 or -2,and the formal charge of H is 0. 
D) The formal charge of S is +2,the formal charge of O is 0,and the formal charge of H is +1. 
E) The formal charge of S is 0,the formal charge of O is 0,and the formal charge of H is 0. 
A) The formal charge of S is +2,the formal charge of each O is 0,and the formal charge H is 0. 
B) The formal charge of S is +2,the formal charge of O is either 0 or -2,and the formal charge of H is +1. 
C) The formal charge of S is +2,the formal charge of O is either 0 or -2,and the formal charge of H is 0. 
D) The formal charge of S is +2,the formal charge of O is 0,and the formal charge of H is +1. 
E) The formal charge of S is 0,the formal charge of O is 0,and the formal charge of H is 0.

Question 16

In which of the following molecules is the octet rule violated?

Accepted Answer

A) PF5 
B) OF2 
C) ClF 
D) PF3 
E) SiF4 
A) PF5 
B) OF2 
C) ClF 
D) PF3 
E) SiF4

Question 17

The total number of valence electrons in a peroxide ion,O22-,is

Accepted Answer

A) 2. 
B) 12. 
C) 14. 
D) 13. 
E) 15. 
A) 2. 
B) 12. 
C) 14. 
D) 13. 
E) 15.

Question 18

Rank the following covalent bonds in order of decreasing polarity: C-H,N-H,O-H,F-H.

Accepted Answer

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

Question 19

Which of the following statements concerning lattice energy is false?

Accepted Answer

A) MgO has a larger lattice energy than NaF. 
B) The lattice energy for a solid with 2+ and 2- ions should be two times that for a solid with 1+ and 1- ions. 
C) MgO has a larger lattice energy than LiF. 
D) Lattice energy is often defined as the change in energy that occurs when an ionic solid is separated into isolated ions in the gas phase. 
E) All of these are true. 
A) MgO has a larger lattice energy than NaF. 
B) The lattice energy for a solid with 2+ and 2- ions should be two times that for a solid with 1+ and 1- ions. 
C) MgO has a larger lattice energy than LiF. 
D) Lattice energy is often defined as the change in energy that occurs when an ionic solid is separated into isolated ions in the gas phase. 
E) All of these are true.

Question 20

In the Born-Haber cycle for KI(s),which of the following processes corresponds to the electron affinity of I?

Accepted Answer

A) I(g)→ I+(g)+ e- 
B) KI(s)→ K+(g)+ I-(g) 
C) I-(g)→ I(g)+ e- 
D) I2(g)→ 2I(g) 
E) I(g)+ e- → I-(g) 
A) I(g)→ I+(g)+ e- 
B) KI(s)→ K+(g)+ I-(g) 
C) I-(g)→ I(g)+ e- 
D) I2(g)→ 2I(g) 
E) I(g)+ e- → I-(g)

Exam 9: Ionic and Covalent Bonding

What is the ground-state electron configuration of Ni2+?

In which of the following lists do the ions not appear in order of increasing ionic radius?

In the Born-Haber cycle for NaCl(s),which of the following processes corresponds to the enthalpy of formation of NaCl(s)?

The total number of valence electrons in the tetrathionate ion,S4O62-,is

Which of the following are two appropriate resonance formulas for the acetate ion,CH3CO2-?

The formation of which monatomic ion of oxygen is the most energetically favorable?

The formulas of many binary covalent compounds can be predicted on the basis

In which pair do both compounds exhibit predominantly ionic bonding?

What is the electron configuration for ? Mn3+

In the Lewis formula for ClF3,how many lone pairs are around the central atom?

What is the total number of valence electrons in the cyanate ion,CNO- ion,?

What is the ground-state electron configuration of the phosphide ion?

Using bond-energy data,what is ΔH° for the following reaction? CH4(g)+ 2F2(g)→ CF4(g)+ 2H2(g) Bond Bond Energy (kJ/mol) C-H 413 H-H 432 F-F 159 C-F 485

In the Lewis formula that minimizes formal charge,what is the formal charge on the sulfur atom in sulfur trioxide,SO3?

Which of the following statements is true concerning the Lewis formula that minimizes formal charge for H2SO4?

In which of the following molecules is the octet rule violated?

The total number of valence electrons in a peroxide ion,O22-,is

Rank the following covalent bonds in order of decreasing polarity: C-H,N-H,O-H,F-H.

Which of the following statements concerning lattice energy is false?

In the Born-Haber cycle for KI(s),which of the following processes corresponds to the electron affinity of I?

Chemistry and Measurement

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Quantum Theory of the Atom

Electron Configurations and Periodicity

Molecular Geometry and Chemical Bonding Theory

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Rates of Reaction

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Filters

What is the ground-state electron configuration of Ni²⁺?

The total number of valence electrons in the tetrathionate ion,S₄O₆^2-,is

Which of the following are two appropriate resonance formulas for the acetate ion,CH₃CO₂^-?

What is the electron configuration for ? Mn³⁺

In the Lewis formula for ClF₃,how many lone pairs are around the central atom?

What is the total number of valence electrons in the cyanate ion,CNO^-ion,?

Using bond-energy data,what is ΔH° for the following reaction? CH₄(g)+ 2F₂(g)→ CF₄(g)+ 2H₂(g) Bond Bond Energy (kJ/mol) C-H 413 H-H 432 F-F 159 C-F 485

In the Lewis formula that minimizes formal charge,what is the formal charge on the sulfur atom in sulfur trioxide,SO₃?

Which of the following statements is true concerning the Lewis formula that minimizes formal charge for H₂SO₄?

The total number of valence electrons in a peroxide ion,O₂^2-,is