Question 1

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 2

Which of the elements listed below has the greatest electronegativity?

Accepted Answer

A) Mg 
B) Ga 
C) Si 
D) Ba 
E) Pb 
A) Mg 
B) Ga 
C) Si 
D) Ba 
E) Pb

Question 3

Which of the atoms listed below is the most electronegative?

Accepted Answer

A) Li 
B) Cs 
C) P 
D) As 
E) Ge 
A) Li 
B) Cs 
C) P 
D) As 
E) Ge

Question 4

Which one of the following is most likely to be an ionic compound?

Accepted Answer

A) CaCl2 
B) CO2 
C) CS2 
D) SO2 
E) OF2 
A) CaCl2 
B) CO2 
C) CS2 
D) SO2 
E) OF2

Question 5

Which of the elements listed below 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

Question 6

The bond in which one of the following pairs of atoms would be the most polar?

Accepted Answer

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

Question 7

Write the Lewis structure of ammonia (nitrogen trihydride).

Accepted Answer

The answer of Write the Lewis structure of ammonia (nitrogen...

Question 8

Calculate the energy change for the reaction K(g)+ Br(g)$\rarr$ K+(g)+ Br- (g)
Given the following ionization energy (IE)and electron affinity (EA)values

Accepted Answer

A) -1,092 kJ/mol 
B) -95 kJ/mol 
C) 95 kJ/mol 
D) 1,092 kJ/mol 
E) 1,187 kJ/mol 
A) -1,092 kJ/mol 
B) -95 kJ/mol 
C) 95 kJ/mol 
D) 1,092 kJ/mol 
E) 1,187 kJ/mol

Question 9

Carbonic acid, H2CO3, is a weak acid that contributes to the taste and produces the carbon dioxide bubbles in all carbonated beverages. Write a Lewis structure for H2CO3,

Accepted Answer

Question 10

Classify the Ca - Cl bond in CaCl2 as ionic, polar covalent, or nonpolar covalent.

Accepted Answer

A) ionic 
B) polar covalent 
C) nonpolar covalent 
A) ionic 
B) polar covalent 
C) nonpolar covalent

Question 11

The total number of lone pairs in NCl3 is

Accepted Answer

A) 6. 
B) 8. 
C) 9. 
D) 10. 
E) 13. 
A) 6. 
B) 8. 
C) 9. 
D) 10. 
E) 13.

Question 12

Which one of the following molecules has an atom with an incomplete octet?

Accepted Answer

A) NF3 
B) H2O 
C) AsCl3 
D) GeH4 
E) BF3 
A) NF3 
B) H2O 
C) AsCl3 
D) GeH4 
E) BF3

Question 13

BeF42- is called the fluoberyllate ion. The formal charge on the beryllium atom in this 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 14

Consider the hypothetical element X with electron-dot formula   Give the formula for the simplest compound this element forms with chlorine.

Accepted Answer

The answer of Consider the hypothetical element X with electron-dot...

Question 15

Which of the following is a useful guideline for the application of formal charges in neutral molecules?

Accepted Answer

A) A Lewis structure in which there are no formal charges is preferred. 
B) Lewis structures with large formal charges are preferred. 
C) The preferred Lewis structure is one in which positive formal charges are on the most electronegative atoms. 
A) A Lewis structure in which there are no formal charges is preferred. 
B) Lewis structures with large formal charges are preferred. 
C) The preferred Lewis structure is one in which positive formal charges are on the most electronegative atoms.

Question 16

The Lewis structure for CS2 is:

Accepted Answer

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

Question 17

Consider the hypothetical element Z with electron-dot formula   Give the formula for the simplest compound this element forms with chlorine.

Accepted Answer

The answer of Consider the hypothetical element Z with electron-dot...

Question 18

Assuming the octet rule is obeyed, how many covalent bonds will an oxygen atom form to give a formal charge of zero?

Accepted Answer

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

Question 19

Which of the following substances will display an incomplete octet in its Lewis structure?

Accepted Answer

A) CO2 
B) Cl2 
C) ICl 
D) NO 
E) SO2 
A) CO2 
B) Cl2 
C) ICl 
D) NO 
E) SO2

Question 20

The number of lone electron pairs in the N2 molecule is ___.

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Exam 9: Chemical Bonding I: the Covalent Bond

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

Which of the elements listed below has the greatest electronegativity?

Which of the atoms listed below is the most electronegative?

Which one of the following is most likely to be an ionic compound?

Which of the elements listed below is most likely to exhibit an expanded octet in its compounds?

The bond in which one of the following pairs of atoms would be the most polar?

Write the Lewis structure of ammonia (nitrogen trihydride).

Calculate the energy change for the reaction K(g)+ Br(g) →\rarr→ K+(g)+ Br- (g) Given the following ionization energy (IE)and electron affinity (EA)values

Carbonic acid, H2CO3, is a weak acid that contributes to the taste and produces the carbon dioxide bubbles in all carbonated beverages. Write a Lewis structure for H2CO3,

Classify the Ca - Cl bond in CaCl2 as ionic, polar covalent, or nonpolar covalent.

The total number of lone pairs in NCl3 is

Which one of the following molecules has an atom with an incomplete octet?

BeF42- is called the fluoberyllate ion. The formal charge on the beryllium atom in this ion is

Consider the hypothetical element X with electron-dot formula Give the formula for the simplest compound this element forms with chlorine.

Which of the following is a useful guideline for the application of formal charges in neutral molecules?

The Lewis structure for CS2 is:

Consider the hypothetical element Z with electron-dot formula Give the formula for the simplest compound this element forms with chlorine.

Assuming the octet rule is obeyed, how many covalent bonds will an oxygen atom form to give a formal charge of zero?

Which of the following substances will display an incomplete octet in its Lewis structure?

The number of lone electron pairs in the N2 molecule is ___.

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Carbonic acid, H₂CO₃, is a weak acid that contributes to the taste and produces the carbon dioxide bubbles in all carbonated beverages. Write a Lewis structure for H₂CO₃,

Classify the Ca - Cl bond in CaCl₂ as ionic, polar covalent, or nonpolar covalent.

The total number of lone pairs in NCl₃ is

BeF₄^2- is called the fluoberyllate ion. The formal charge on the beryllium atom in this ion is

The Lewis structure for CS₂ is:

The number of lone electron pairs in the N₂ molecule is ___.