Question 1

Atoms of elements with low ionization energies tend to form ________ while those with positive electron affinities tend to form ________.

Accepted Answer

The answer of Atoms of elements with low ionization energies...

Question 2

How many dots does the Lewis dot symbol for carbon have around it?

Accepted Answer

A)  4 
B)  2 
C)  6 
D)  3 
E)  7 
A)  4 
B)  2 
C)  6 
D)  3 
E)  7

Question 3

Lewis theorized the octet rule to describe chemical bonding where atoms lose, gain, or share electrons in order to achieve a noble gas configuration.

Accepted Answer

A) True 
 B)False

Question 4

Which pair of Lewis structures is not a pair of resonance structures?

Accepted Answer

A)    
B)    
C)    
D)  All of these pairs are resonance structures of the same species. 
E)  None of these pairs is resonance structures of the same species. 
A)    
B)    
C)    
D)  All of these pairs are resonance structures of the same species. 
E)  None of these pairs is resonance structures of the same species.

Question 5

Ionic compounds may carry a net positive or net negative charge.

Accepted Answer

A) True 
 B)False

Question 6

The Lewis dot symbol for the calcium ion is

Accepted Answer

A)    
B)    
C)    
D)  Ca2+ 
E)  Ca 
A)    
B)    
C)    
D)  Ca2+ 
E)  Ca

Question 7

Unshared electrons are always shown in pairs around an atom.

Accepted Answer

A) True 
 B)False

Question 8

Ignoring resonance, the formal charge on the nitrogen atom in the nitrate ion is

Accepted Answer

A)  +2. 
B)  +1. 
C)  0. 
D)  -1. 
E)  -2. 
A)  +2. 
B)  +1. 
C)  0. 
D)  -1. 
E)  -2.

Question 9

What is the formal charge on the fluorine in ClF2+?

Accepted Answer

A)  -1 
B)  +1 
C)  0 
D)  -2 
E)  -3 
A)  -1 
B)  +1 
C)  0 
D)  -2 
E)  -3

Question 10

Which of the following contains covalent bonds?

Accepted Answer

A)  BaO 
B)  IBr 
C)  Mg 
D)  LiBr 
E)  Cu 
A)  BaO 
B)  IBr 
C)  Mg 
D)  LiBr 
E)  Cu

Question 11

In which one of the following structures does the central atom have a formal charge of +2?

Accepted Answer

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

Question 12

A single bond between two atoms represents ________ pair(s) of electrons.

Accepted Answer

The answer of A single bond between two atoms represents...

Question 13

Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.

Accepted Answer

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

Question 14

The number of resonance structures for the nitrate ion that satisfy the octet rule is

Accepted Answer

A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  none of these 
A)  1. 
B)  2. 
C)  3. 
D)  4. 
E)  none of these

Question 15

The Lewis dot symbol for the chloride ion is

Accepted Answer

A)    
B)    
C)    
D)    
E)  Cl- 
A)    
B)    
C)    
D)    
E)  Cl-

Question 16

Hydrazine, N2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

Accepted Answer

A)    
B)    
C)    
D)    
E)  None of the choices is correct. 
A)    
B)    
C)    
D)    
E)  None of the choices is correct.

Question 17

How many dots does the Lewis dot symbol for sodium have around it?

Accepted Answer

A)  1 
B)  2 
C)  0 
D)  3 
E)  11 
A)  1 
B)  2 
C)  0 
D)  3 
E)  11

Question 18

The lattice energy for ionic crystals increases as the charge on the ions ________ and the size of the ions ________.

Accepted Answer

A)  increases, increases 
B)  increases, decreases 
C)  decreases, increases 
D)  decreases, decreases 
E)  None of these is generally correct. 
A)  increases, increases 
B)  increases, decreases 
C)  decreases, increases 
D)  decreases, decreases 
E)  None of these is generally correct.

Question 19

In which one of the following is the best Lewis structure a resonance structure?

Accepted Answer

A)  SO3 
B)  BF3 
C)  I3- 
D)  SCO (C = central atom) 
E)  SO32- 
A)  SO3 
B)  BF3 
C)  I3- 
D)  SCO (C = central atom) 
E)  SO32-

Question 20

Which of these elements is most likely to exhibit an expanded octet in its compounds?

Accepted Answer

A)  O 
B)  S 
C)  Na 
D)  C 
E)  N 
A)  O 
B)  S 
C)  Na 
D)  C 
E)  N

Exam 8: Chemical Bonding I: Basic Concepts

Atoms of elements with low ionization energies tend to form ________ while those with positive electron affinities tend to form ________.

How many dots does the Lewis dot symbol for carbon have around it?

Lewis theorized the octet rule to describe chemical bonding where atoms lose, gain, or share electrons in order to achieve a noble gas configuration.

Which pair of Lewis structures is not a pair of resonance structures?

Ionic compounds may carry a net positive or net negative charge.

The Lewis dot symbol for the calcium ion is

Unshared electrons are always shown in pairs around an atom.

Ignoring resonance, the formal charge on the nitrogen atom in the nitrate ion is

What is the formal charge on the fluorine in ClF2+?

Which of the following contains covalent bonds?

In which one of the following structures does the central atom have a formal charge of +2?

A single bond between two atoms represents ________ pair(s) of electrons.

Select the Lewis structure for XeO2F2 which correctly minimizes formal charges.

The number of resonance structures for the nitrate ion that satisfy the octet rule is

The Lewis dot symbol for the chloride ion is

Hydrazine, N2H4, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

How many dots does the Lewis dot symbol for sodium have around it?

The lattice energy for ionic crystals increases as the charge on the ions ________ and the size of the ions ________.

In which one of the following is the best Lewis structure a resonance structure?

Which of these elements is most likely to exhibit an expanded octet in its compounds?

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Reactions in Aqueous Solutions

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

Atoms of elements with low ionization energies tend to form while those with positive electron affinities tend to form .

What is the formal charge on the fluorine in ClF₂⁺?

Select the Lewis structure for XeO₂F₂ which correctly minimizes formal charges.

Hydrazine, N₂H₄, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

The lattice energy for ionic crystals increases as the charge on the ions and the size of the ions .