Question 1

Which of the following species represents an exception to the octet rule?

Accepted Answer

A) BF3 
B) BF4- 
C) CH3OH 
D) CCl4 
E) PH3 
A) BF3 
B) BF4- 
C) CH3OH 
D) CCl4 
E) PH3

Question 2

Rank the following species in order of decreasing radii: AlS1U1P13+S1S1P0,MgS1U1P12+S1S1P0,AlS1U1P13+S1S1P0,AlS1U1P13+S1S1P0.

Accepted Answer

A) AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 > MgS1U1P12+S1S1P0 > Al 
B) AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 > MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 
C) AlS1U1P13+S1S1P0> MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 
D) AlS1U1P13+S1S1P0 > MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 
E) MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 
A) AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 > MgS1U1P12+S1S1P0 > Al 
B) AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 > MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 
C) AlS1U1P13+S1S1P0> MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 
D) AlS1U1P13+S1S1P0 > MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 
E) MgS1U1P12+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0 > AlS1U1P13+S1S1P0

Question 3

In the Lewis dot formula that minimizes formal charge,how many bonds are there in the tetrathionate ion,S4O62- ?

Accepted Answer

A) 7 
B) 9 
C) 15 
D) 11 
E) 13 
A) 7 
B) 9 
C) 15 
D) 11 
E) 13

Question 4

In which of the following species is there the greatest unequal sharing of the bonding electrons?

Accepted Answer

A) SO3 
B) SO32- 
C) H2S 
D) H2O 
E) NH4+ 
A) SO3 
B) SO32- 
C) H2S 
D) H2O 
E) NH4+

Question 5

What is the electron configuration of Mn2+?

Accepted Answer

A) [Ar]3d5 
B) [Ar]3d34s2 
C) [Ar]3d44s1 
D) [Ar]3d54s2 
E) [Ar]3d54s1 
A) [Ar]3d5 
B) [Ar]3d34s2 
C) [Ar]3d44s1 
D) [Ar]3d54s2 
E) [Ar]3d54s1

Question 6

Rank the following ions in order of decreasing atomic radii: Os4+,Os2+,Os5+.

Accepted Answer

A) Os2+ > Os4+ > Os5+ 
B) Os5+ > Os4+ > Os2+ 
C) Os4+ > Os2+ > Os5+ 
D) Os5+ > Os2+ > Os4+ 
E) Os2+ > Os5+ > Os4+ 
A) Os2+ > Os4+ > Os5+ 
B) Os5+ > Os4+ > Os2+ 
C) Os4+ > Os2+ > Os5+ 
D) Os5+ > Os2+ > Os4+ 
E) Os2+ > Os5+ > Os4+

Question 7

What is the total number of valence electrons in the monohydrogen phosphate ion,HPO42-?

Accepted Answer

A) 30 
B) 28 
C) 32 
D) 34 
E) 36 
A) 30 
B) 28 
C) 32 
D) 34 
E) 36

Question 8

The normal distance between nuclei of two bonded atoms in a molecule is called _____.

Accepted Answer

A) ​bond length 
B) ​focal length 
C) ​bar length 
D) ​dipole length 
E) ​arc length 
A) ​bond length 
B) ​focal length 
C) ​bar length 
D) ​dipole length 
E) ​arc length

Question 9

How many valence electrons are there in the tetramethylammonium ion,(CH3)4N+?

Accepted Answer

A) 32 
B) 18 
C) 8 
D) 33 
E) 24 
A) 32 
B) 18 
C) 8 
D) 33 
E) 24

Question 10

The energy that must be added to separate the atoms in a molecule is called the _____.

Accepted Answer

A) ​electric potential energy 
B) ​elastic potential energy 
C) ​gravitational potential energy 
D) ​ionization energy 
E) ​bond dissociation energy 
A) ​electric potential energy 
B) ​elastic potential energy 
C) ​gravitational potential energy 
D) ​ionization energy 
E) ​bond dissociation energy

Question 11

The Lewis formula for phosphine,PH3,has

Accepted Answer

A) four lone pairs. 
B) four bonding pairs. 
C) two bonding pairs and two lone pairs. 
D) three bonding pairs and one lone pair. 
E) one bonding pair and three lone pairs. 
A) four lone pairs. 
B) four bonding pairs. 
C) two bonding pairs and two lone pairs. 
D) three bonding pairs and one lone pair. 
E) one bonding pair and three lone pairs.

Question 12

Which of the following is a correct Lewis electron-dot formula for H2SO4?

Accepted Answer

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

Question 13

Which of the following compounds would be expected to have the highest melting point?

Accepted Answer

A) NCl3 
B) OCl2 
C) MgCl2 
D) LiCl 
E) CCl4 
A) NCl3 
B) OCl2 
C) MgCl2 
D) LiCl 
E) CCl4

Question 14

Which of the following species is isoelectronic with Ar?

Accepted Answer

A) Na+ 
B) ​Ca2+ 
C) ​Ga3+ 
D) ​O2- 
E) ​Ne 
A) Na+ 
B) ​Ca2+ 
C) ​Ga3+ 
D) ​O2- 
E) ​Ne

Question 15

Use the bond energies provided to complete the following statement.
________ when all of the bonds in acetic acid (CH3COOH)are broken.
Bond
Bond Energy (kJ/mol)
C-H
413
C-O
358
O-H
463
C=O
745
C-C
348
C=C
614

Accepted Answer

A) 3153 kJ/mol of energy is consumed 
B) 3153 kJ/mol of energy is released 
C) 2805 kJ/mol of energy is released 
D) 2805 kJ/mol of energy is consumed 
E) 2766 kJ/mol of energy is consumed 
A) 3153 kJ/mol of energy is consumed 
B) 3153 kJ/mol of energy is released 
C) 2805 kJ/mol of energy is released 
D) 2805 kJ/mol of energy is consumed 
E) 2766 kJ/mol of energy is consumed

Question 16

When the cations Na+,K+,Rb+,Cs+ are combined with chloride ion in the gas phase to form ion pairs,which pair formation releases the greatest amount of energy?

Accepted Answer

A) KCl 
B) All release the same amount of energy. 
C) RbCl 
D) NaCl 
E) CsCl 
A) KCl 
B) All release the same amount of energy. 
C) RbCl 
D) NaCl 
E) CsCl

Question 17

The measure of the attraction that an atom has for the electrons in a chemical bond is called

Accepted Answer

A) electronegativity. 
B) lattice energy. 
C) resonance energy. 
D) ionization energy. 
E) electron affinity. 
A) electronegativity. 
B) lattice energy. 
C) resonance energy. 
D) ionization energy. 
E) electron affinity.

Question 18

Which one of the following has a Lewis formula most similar to that of NO-?

Accepted Answer

A) O2 
B) O22- 
C) O2- 
D) NO+ 
E) NO 
A) O2 
B) O22- 
C) O2- 
D) NO+ 
E) NO

Question 19

Which of the following has an incomplete octet in its Lewis structure?

Accepted Answer

A) SO2 
B) F2 
C) ClO2 
D) ICl 
E) CO2 
A) SO2 
B) F2 
C) ClO2 
D) ICl 
E) CO2

Question 20

Which of the following compounds has the most ionic bonding (has the highest percentage of ionic character)?

Accepted Answer

A) CaF2 
B) LiI 
C) OF2 
D) CsF 
E) LiF 
A) CaF2 
B) LiI 
C) OF2 
D) CsF 
E) LiF

Exam 9: Ionic and Covalent Bonding

Which of the following species represents an exception to the octet rule?

Rank the following species in order of decreasing radii: Al3+,Mg2+,Al3+,Al3+.

In the Lewis dot formula that minimizes formal charge,how many bonds are there in the tetrathionate ion,S4O62- ?

In which of the following species is there the greatest unequal sharing of the bonding electrons?

What is the electron configuration of Mn2+?

Rank the following ions in order of decreasing atomic radii: Os4+,Os2+,Os5+.

What is the total number of valence electrons in the monohydrogen phosphate ion,HPO42-?

The normal distance between nuclei of two bonded atoms in a molecule is called _____.

How many valence electrons are there in the tetramethylammonium ion,(CH3)4N+?

The energy that must be added to separate the atoms in a molecule is called the _____.

The Lewis formula for phosphine,PH3,has

Which of the following is a correct Lewis electron-dot formula for H2SO4?

Which of the following compounds would be expected to have the highest melting point?

Which of the following species is isoelectronic with Ar?

Use the bond energies provided to complete the following statement. ________ when all of the bonds in acetic acid (CH3COOH)are broken. Bond Bond Energy (kJ/mol) C-H 413 C-O 358 O-H 463 C=O 745 C-C 348 C=C 614

When the cations Na+,K+,Rb+,Cs+ are combined with chloride ion in the gas phase to form ion pairs,which pair formation releases the greatest amount of energy?

The measure of the attraction that an atom has for the electrons in a chemical bond is called

Which one of the following has a Lewis formula most similar to that of NO-?

Which of the following has an incomplete octet in its Lewis structure?

Which of the following compounds has the most ionic bonding (has the highest percentage of ionic character)?

Chemistry and Measurement

Atoms, molecules, and Ions

Calculations With Chemical Formulas and Equations

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Electron Configurations and Periodicity

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Polymer Materials: Synthetic and Biological

Filters

Rank the following species in order of decreasing radii: Al³⁺,Mg²⁺,Al³⁺,Al³⁺.

In the Lewis dot formula that minimizes formal charge,how many bonds are there in the tetrathionate ion,S₄O₆^2- ?

What is the electron configuration of Mn²⁺?

Rank the following ions in order of decreasing atomic radii: Os⁴⁺,Os²⁺,Os⁵⁺.

What is the total number of valence electrons in the monohydrogen phosphate ion,HPO₄^2-?

How many valence electrons are there in the tetramethylammonium ion,(CH₃)₄N⁺?

The Lewis formula for phosphine,PH₃,has

Which of the following is a correct Lewis electron-dot formula for H₂SO₄?

Use the bond energies provided to complete the following statement. ________ when all of the bonds in acetic acid (CH₃COOH)are broken. Bond Bond Energy (kJ/mol) C-H 413 C-O 358 O-H 463 C=O 745 C-C 348 C=C 614

When the cations Na⁺,K⁺,Rb⁺,Cs⁺ are combined with chloride ion in the gas phase to form ion pairs,which pair formation releases the greatest amount of energy?

Which one of the following has a Lewis formula most similar to that of NO^-?