Question 1

Which of the following solids would have the lowest melting point?

Accepted Answer

A) KI 
B) KBr 
C) KCl 
D) KF 
A) KI 
B) KBr 
C) KCl 
D) KF

Question 2

Which of the following solids would have the highest melting point?

Accepted Answer

A) NaF 
B) NaCl 
C) NaBr 
D) NaI 
A) NaF 
B) NaCl 
C) NaBr 
D) NaI

Question 3

How many covalent bonds will be drawn to bromine in BrO3- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

Accepted Answer

A) 3 
B) 4 
C) 5 
D) 6 
E) 7 
A) 3 
B) 4 
C) 5 
D) 6 
E) 7

Question 4

The Si - Cl bond has less ionic character than the C - Cl bond.

Accepted Answer

A) True 
 B)False

Question 5

The polarity of covalent bonds increases as the percent ionic character increases.

Accepted Answer

A) True 
 B)False

Question 6

Estimate the enthalpy change for the combustion of one mole of acetylene, C2H2, to form carbon dioxide and water vapor. BE(C-H)= 456 kJ/mol
BE(C$\equiv$C)= 962 kJ/mol
BE(O=O)= 499 kJ/mol
BE(C=O)= 802 kJ/mol
BE(O-H)= 462 kJ/mol

Accepted Answer

A) -1759 kJ/mol 
B) +653 kJ/mol 
C) +1010 kJ/mol 
D) -1010 kJ/mol 
E) -155 kJ/mol 
A) -1759 kJ/mol 
B) +653 kJ/mol 
C) +1010 kJ/mol 
D) -1010 kJ/mol 
E) -155 kJ/mol

Question 7

The Lewis dot symbol for the a lead atom is

Accepted Answer

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

Question 8

Which of the following covalent bonds is the most polar (i.e., highest percent ionic character)?

Accepted Answer

A) Al - I 
B) Si - I 
C) Al - Cl 
D) Si - Cl 
E) Si - P 
A) Al - I 
B) Si - I 
C) Al - Cl 
D) Si - Cl 
E) Si - P

Question 9

Write a Lewis structure for SO3 that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for SO3 that obey the octet rule.

Accepted Answer

@#IMG-DLM& Total number of res

Question 10

Complete this statement: Coulomb's law states that the magnitude of the force of interaction between two charged bodies is

Accepted Answer

A) directly proportional to the product of the charges on the bodies and directly proportional to the distance separating them. 
B) directly proportional to the product of the charges on the bodies, and inversely proportional to the square of the distance separating them. 
C) inversely proportional to the product of the charges on the bodies, and directly proportional to the square of the distance separating them. 
D) directly proportional to the sum of the charges on the bodies, and inversely proportional to the square of the distance separating them. 
A) directly proportional to the product of the charges on the bodies and directly proportional to the distance separating them. 
B) directly proportional to the product of the charges on the bodies, and inversely proportional to the square of the distance separating them. 
C) inversely proportional to the product of the charges on the bodies, and directly proportional to the square of the distance separating them. 
D) directly proportional to the sum of the charges on the bodies, and inversely proportional to the square of the distance separating them.

Question 11

The Lewis structure for CS2 is:

Accepted Answer

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

Question 12

What is the formal charge on sulfur in the best Lewis structure for the SCN- (thiocyanate)ion?

Accepted Answer

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

Question 13

Which one of the following compounds does not follow the octet rule?

Accepted Answer

A) NF3 
B) CO2 
C) CF4 
D) Br2 
E) NO 
A) NF3 
B) CO2 
C) CF4 
D) Br2 
E) NO

Question 14

What is the formal charge on the singly bonded oxygens in the Lewis structure for the carbonate ion?

Accepted Answer

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

Question 15

What is the formal charge on phosphorus in a Lewis structure for the phosphate ion that satisfies the octet rule?

Accepted Answer

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

Question 16

Which of the elements listed below is the least electronegative?

Accepted Answer

A) Sr 
B) V 
C) Ni 
D) P 
E) I 
A) Sr 
B) V 
C) Ni 
D) P 
E) I

Question 17

A nonpolar covalent bond (i.e., pure covalent)would form in which one of the following pairs of atoms?

Accepted Answer

A) Na - Cl 
B) H - Cl 
C) Li - Br 
D) Se - Br 
E) Br - Br 
A) Na - Cl 
B) H - Cl 
C) Li - Br 
D) Se - Br 
E) Br - Br

Question 18

Use the bond enthalpy data given to estimate the heat released when 25.0 g of acetylene gas, C2H2, burns in excess oxygen to yield carbon dioxide and water vapor at 25°C. BE(C-C)= 347 kJ/mol
BE(C$\equiv$C)= 812 kJ/mol
BE(C=O in CO2)= 799 kJ/mol
BE(C-H)= 414 kJ/mol
BE(O-H)= 460 kJ/mol
BE(O=O)= 498.7 kJ/mol

Accepted Answer

A) 1180 kJ 
B) 447 kJ 
C) 364 kJ 
D) 1230 kJ 
E) 16.8 kJ 
A) 1180 kJ 
B) 447 kJ 
C) 364 kJ 
D) 1230 kJ 
E) 16.8 kJ

Question 19

Use the Born-Haber cycle to calculate the lattice energy of KCl(s)given the following data: $\Delta$H(sublimation)K = 79.2 kJ/mol
I1 (K)= 418.7 kJ/mol
Bond energy (Cl-Cl)= 242.8 kJ/mol
EA (Cl)= 348 kJ/mol
$\Delta$H   (KCl(s))= -435.7 kJ/mol

Accepted Answer

A) -165 kJ/mol 
B) 288 kJ/mol 
C) 629 kJ/mol 
D) 707 kJ/mol 
E) 828 kJ/mol 
A) -165 kJ/mol 
B) 288 kJ/mol 
C) 629 kJ/mol 
D) 707 kJ/mol 
E) 828 kJ/mol

Question 20

Which of the bonds below would have the greatest polarity (i.e., highest percent ionic character)?

Accepted Answer

A) Si - P 
B) Si - S 
C) Si - Se 
D) Si - Cl 
E) Si - I 
A) Si - P 
B) Si - S 
C) Si - Se 
D) Si - Cl 
E) Si - I

Exam 9: Chemical Bonding I: Basic Concepts

Which of the following solids would have the lowest melting point?

Which of the following solids would have the highest melting point?

How many covalent bonds will be drawn to bromine in BrO3- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

The Si - Cl bond has less ionic character than the C - Cl bond.

The polarity of covalent bonds increases as the percent ionic character increases.

Estimate the enthalpy change for the combustion of one mole of acetylene, C2H2, to form carbon dioxide and water vapor. BE(C-H)= 456 kJ/mol BE(C ≡\equiv≡ C)= 962 kJ/mol BE(O=O)= 499 kJ/mol BE(C=O)= 802 kJ/mol BE(O-H)= 462 kJ/mol

The Lewis dot symbol for the a lead atom is

Which of the following covalent bonds is the most polar (i.e., highest percent ionic character)?

Write a Lewis structure for SO3 that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for SO3 that obey the octet rule.

Complete this statement: Coulomb's law states that the magnitude of the force of interaction between two charged bodies is

The Lewis structure for CS2 is:

What is the formal charge on sulfur in the best Lewis structure for the SCN- (thiocyanate)ion?

Which one of the following compounds does not follow the octet rule?

What is the formal charge on the singly bonded oxygens in the Lewis structure for the carbonate ion?

What is the formal charge on phosphorus in a Lewis structure for the phosphate ion that satisfies the octet rule?

Which of the elements listed below is the least electronegative?

A nonpolar covalent bond (i.e., pure covalent)would form in which one of the following pairs of atoms?

Use the Born-Haber cycle to calculate the lattice energy of KCl(s)given the following data: Δ\DeltaΔ H(sublimation)K = 79.2 kJ/mol I1 (K)= 418.7 kJ/mol Bond energy (Cl-Cl)= 242.8 kJ/mol EA (Cl)= 348 kJ/mol Δ\DeltaΔ H (KCl(s))= -435.7 kJ/mol

Which of the bonds below would have the greatest polarity (i.e., highest percent ionic character)?

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solution

Gases

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

How many covalent bonds will be drawn to bromine in BrO₃^- for the dot structure that expands the octet to minimize formal charge and if necessary places negative formal charges on the most electronegative atom(s).

Estimate the enthalpy change for the combustion of one mole of acetylene, C₂H₂, to form carbon dioxide and water vapor. BE(C-H)= 456 kJ/mol BE(C $\equiv$ C)= 962 kJ/mol BE(O=O)= 499 kJ/mol BE(C=O)= 802 kJ/mol BE(O-H)= 462 kJ/mol

Write a Lewis structure for SO₃ that obeys the octet rule, showing all non-zero formal charges, and give the total number of resonance structures for SO₃ that obey the octet rule.

The Lewis structure for CS₂ is:

What is the formal charge on sulfur in the best Lewis structure for the SCN^- (thiocyanate)ion?