Question 1

The more C-O and O-H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned.

Accepted Answer

A) True 
 B)False  False

Question 2

A Born-Haber cycle applied to the formation reaction of an ionic solid

Accepted Answer

A)  is normally used to calculate ionization energy. 
B)  is normally used to calculate electron affinity. 
C)  is normally used to calculate bond energy. 
D)  is normally used to determine the overall enthalpy change. 
E)  is an application of Hess's Law. 
A)  is normally used to calculate ionization energy. 
B)  is normally used to calculate electron affinity. 
C)  is normally used to calculate bond energy. 
D)  is normally used to determine the overall enthalpy change. 
E)  is an application of Hess's Law. E

Question 3

In not more than three sentences, describe the electron arrangement responsible for bonding in solid SrCl2.

Accepted Answer

This is an example of ionic bonding in which Sr, from group 2A (2) will be present as Sr²⁺ ions, while Cl, from group 7A (7) will be present as Cl^- ions. The cations and anions will be arranged in a crystalline lattice so that nearest neighbors will be ions of opposite charge, thus achieving a net coulombic attraction. There are no molecules present; each ion is equally attracted to all its nearest neighbors.

Question 4

Quartz (SiO2) is a solid with a melting point of 1550 °C. The bonding in quartz is best described as

Accepted Answer

A)  lattice energy. 
B)  network attractions. 
C)  ionic bonding. 
D)  covalent bonding. 
E)  metallic bonding. 
A)  lattice energy. 
B)  network attractions. 
C)  ionic bonding. 
D)  covalent bonding. 
E)  metallic bonding.

Question 5

A single covalent bond consists of a single delocalized electron pair.

Accepted Answer

A) True 
 B)False

Question 6

Select the compound with the lowest (i.e., least negative) lattice energy.

Accepted Answer

A)  CsBr(s) 
B)  NaCl(s) 
C)  SrO(s) 
D)  CaO(s) 
E)  KBr(s) 
A)  CsBr(s) 
B)  NaCl(s) 
C)  SrO(s) 
D)  CaO(s) 
E)  KBr(s)

Question 7

Give a clear and concise definition of the term "electronegativity"; i.e., what does it measure?

Accepted Answer

Electronegativity measures an

Question 8

As a measure of the strength of metallic bonding, the boiling point of a metal is a better indicator than its melting point.

Accepted Answer

A) True 
 B)False

Question 9

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given.

Accepted Answer

A)  -484 kJ 
B)  -366 kJ 
C)  -48 kJ 
D)  +48 kJ 
E)  +366 kJ 
A)  -484 kJ 
B)  -366 kJ 
C)  -48 kJ 
D)  +48 kJ 
E)  +366 kJ

Question 10

Which of the following compounds displays the greatest ionic character in its bonds?

Accepted Answer

A)  NO2 
B)  CO2 
C)  H2O 
D)  HF 
E)  NH3 
A)  NO2 
B)  CO2 
C)  H2O 
D)  HF 
E)  NH3

Question 11

When one mole of each of the following liquids is burned, which will produce the most heat energy?

Accepted Answer

A)  C6H14 
B)  C5H12 
C)  C6H14O 
D)  C6H12O 
E)  C6H10O3 
A)  C6H14 
B)  C5H12 
C)  C6H14O 
D)  C6H12O 
E)  C6H10O3

Question 12

The stronger the bonds in a fuel, the more energy it will yield.

Accepted Answer

A) True 
 B)False

Question 13

Electronegativities on Pauling's scale are calculated from ionization energies and electron affinities.

Accepted Answer

A) True 
 B)False

Question 14

The lattice energy of MgCl2 is the energy change for which one of the following processes?

Accepted Answer

A)  Mg(s) + Cl2(g) F1F1F1S1F1F1F10 MgCl2(s) 
B)  Mg(g) + 2Cl(g) F1F1F1S1F1F1F10 MgCl2(s) 
C)  Mg2+(s) + 2Cl-(g) F1F1F1S1F1F1F10 gCl2(g) 
D)  Mg2+(g) + 2Cl-(g) F1F1F1S1F1F1F10 MgCl2(s) 
E)  MgCl2(aq) F1F1F1S1F1F1F10 MgCl2(s) 
A)  Mg(s) + Cl2(g) F1F1F1S1F1F1F10 MgCl2(s) 
B)  Mg(g) + 2Cl(g) F1F1F1S1F1F1F10 MgCl2(s) 
C)  Mg2+(s) + 2Cl-(g) F1F1F1S1F1F1F10 gCl2(g) 
D)  Mg2+(g) + 2Cl-(g) F1F1F1S1F1F1F10 MgCl2(s) 
E)  MgCl2(aq) F1F1F1S1F1F1F10 MgCl2(s)

Question 15

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 16

Most of the copper sold in major metal markets is highly purified, typically to 99.99%. Why is this?

Accepted Answer

The main use of copper is as a

Question 17

Select the correct formula for a compound formed from calcium and chlorine.

Accepted Answer

A)  CaCl 
B)  CaCl2 
C)  Ca2Cl 
D)  Ca2Cl2 
E)  CaCl3 
A)  CaCl 
B)  CaCl2 
C)  Ca2Cl 
D)  Ca2Cl2 
E)  CaCl3

Question 18

Select the element whose Lewis symbol is correct.

Accepted Answer

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

Question 19

Using appropriate, real examples to illustrate your answer, describe the correlation between bond energy and bond length for a series of single bonds.

Accepted Answer

The bonds between carbon, C, and the hal

Question 20

A hypothetical ionic substance will not form merely because it has a high lattice energy. Explain why, using energy-based arguments.

Accepted Answer

In order for an ionic substance to form,

Exam 9: Models of Chemical Bonding

The more C-O and O-H bonds there are in a substance, the greater will be the amount of heat released when a fixed mass of the substance is burned.

A Born-Haber cycle applied to the formation reaction of an ionic solid

In not more than three sentences, describe the electron arrangement responsible for bonding in solid SrCl2.

Quartz (SiO2) is a solid with a melting point of 1550 °C. The bonding in quartz is best described as

A single covalent bond consists of a single delocalized electron pair.

Select the compound with the lowest (i.e., least negative) lattice energy.

Give a clear and concise definition of the term "electronegativity"; i.e., what does it measure?

As a measure of the strength of metallic bonding, the boiling point of a metal is a better indicator than its melting point.

Acetone can be easily converted to isopropyl alcohol by addition of hydrogen to the carbon-oxygen double bond. Calculate the enthalpy of reaction using the bond energies given.

Which of the following compounds displays the greatest ionic character in its bonds?

When one mole of each of the following liquids is burned, which will produce the most heat energy?

The stronger the bonds in a fuel, the more energy it will yield.

Electronegativities on Pauling's scale are calculated from ionization energies and electron affinities.

The lattice energy of MgCl2 is the energy change for which one of the following processes?

Which of the following contains covalent bonds?

Most of the copper sold in major metal markets is highly purified, typically to 99.99%. Why is this?

Select the correct formula for a compound formed from calcium and chlorine.

Select the element whose Lewis symbol is correct.

Using appropriate, real examples to illustrate your answer, describe the correlation between bond energy and bond length for a series of single bonds.

A hypothetical ionic substance will not form merely because it has a high lattice energy. Explain why, using energy-based arguments.

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

In not more than three sentences, describe the electron arrangement responsible for bonding in solid SrCl₂.

Quartz (SiO₂) is a solid with a melting point of 1550 °C. The bonding in quartz is best described as

The lattice energy of MgCl₂ is the energy change for which one of the following processes?