Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

The lattice energy is the energy released when separated ions in the gas phase combine to form ionic molecules in the gas phase.

Accepted Answer

A) True 
 B)False

Question 3

Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ?H $\degree$ for the reaction written below, using the bond energies given.

Accepted Answer

A)  -969 kJ 
B)  -204 kJ 
C)  -105 kJ 
D)  204 kJ 
E)  595 kJ 
A)  -969 kJ 
B)  -204 kJ 
C)  -105 kJ 
D)  204 kJ 
E)  595 kJ

Question 4

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 5

The diameter of a chloride ion is 362 pm, and the diameter of a potassium ion is 276 pm. What is the distance between the nuclei of adjacent chloride and potassium ions in solid potassium chloride?

Accepted Answer

A)  1276 pm 
B)  638 pm 
C)  319 pm 
D)  181 pm 
E)  138 pm 
A)  1276 pm 
B)  638 pm 
C)  319 pm 
D)  181 pm 
E)  138 pm

Question 6

Which one of the following properties is least characteristic of typical metals?

Accepted Answer

A)  moderately high melting point 
B)  high boiling point 
C)  brittleness 
D)  good electrical conductor when solid 
E)  good electrical conductor when molten 
A)  moderately high melting point 
B)  high boiling point 
C)  brittleness 
D)  good electrical conductor when solid 
E)  good electrical conductor when molten

Question 7

Select the correct formula for a compound formed from barium and nitrogen.

Accepted Answer

A)  BaN 
B)  BaN2 
C)  Ba2N3 
D)  Ba2N 
E)  Ba3N2 
A)  BaN 
B)  BaN2 
C)  Ba2N3 
D)  Ba2N 
E)  Ba3N2

Question 8

Using the bond energies provided below, calculate ?H $\degree$ for the reaction   Bond energies: C   H = 413 kJ/mol, Cl   Cl = 243 kJ/mol, C   Cl = 339 kJ/mol, H   Cl = 427 kJ/mol

Accepted Answer

A)  1422 kJ 
B)  440 kJ 
C)  110 kJ 
D)  -110 kJ 
E)  -440 kJ 
A)  1422 kJ 
B)  440 kJ 
C)  110 kJ 
D)  -110 kJ 
E)  -440 kJ

Question 9

Quartz (SiO2) is a solid with a melting point of 1550 $\degree$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 10

Select the strongest bond in the following group.

Accepted Answer

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

Question 11

Bond energy increases as bond order increases, for bonding between a given pair of atoms.

Accepted Answer

A) True 
 B)False

Question 12

The lattice energy of CaF2 is the energy change for which one, if any, of the following processes?

Accepted Answer

A)  Ca2+(s) + 2F¯(g) $\rightarrow$ CaF2(g) 
B)  CaF2(g) $\rightarrow$CaF2(s) 
C)  Ca(g) + 2F(g) $\rightarrow$CaF2(s) 
D)  CaF2(aq) $\rightarrow$CaF2(s) 
E)  None of these choices is correct. 
A)  Ca2+(s) + 2F¯(g) $\rightarrow$ CaF2(g) 
B)  CaF2(g) $\rightarrow$CaF2(s) 
C)  Ca(g) + 2F(g) $\rightarrow$CaF2(s) 
D)  CaF2(aq) $\rightarrow$CaF2(s) 
E)  None of these choices is correct.

Question 13

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

Accepted Answer

Electronegativity measures an

Question 14

Electronegativity is a measure of

Accepted Answer

A)  the energy needed to remove an electron from an atom. 
B)  the energy released when an electron is added to an atom. 
C)  the magnitude of the negative charge on an electron. 
D)  the attraction by an atom for electrons in a chemical bond. 
E)  the magnitude of the negative charge on a molecule. 
A)  the energy needed to remove an electron from an atom. 
B)  the energy released when an electron is added to an atom. 
C)  the magnitude of the negative charge on an electron. 
D)  the attraction by an atom for electrons in a chemical bond. 
E)  the magnitude of the negative charge on a molecule.

Question 15

Combustion of a fat will release more energy than combustion of an equal mass of carbohydrate because

Accepted Answer

A)  fats contain more bonds to oxygen than carbohydrates. 
B)  fats contain fewer bonds to oxygen than carbohydrates. 
C)  the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the carbon-oxygen and oxygen-hydrogen bonds in the reaction products (carbon dioxide and water). 
D)  the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the bonds in carbohydrates. 
E)  fats have higher molar masses than carbohydrates. 
A)  fats contain more bonds to oxygen than carbohydrates. 
B)  fats contain fewer bonds to oxygen than carbohydrates. 
C)  the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the carbon-oxygen and oxygen-hydrogen bonds in the reaction products (carbon dioxide and water). 
D)  the total energy of the carbon-carbon and carbon-hydrogen bonds in fats is greater than the energy content of the bonds in carbohydrates. 
E)  fats have higher molar masses than carbohydrates.

Question 16

When an atom is represented in a Lewis electron dot symbol, the element symbol represents the ______________ and the dots represent the ______________.

Accepted Answer

nucleus an

Question 17

No real bonds are 100% ionic in character.

Accepted Answer

A) True 
 B)False

Question 18

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 w

Question 19

Arrange aluminum, nitrogen, phosphorus and indium in order of increasing electronegativity.

Accepted Answer

A)  Al < In < N < P 
B)  Al < In < P < N 
C)  In < Al < P < N 
D)  In < P < Al < N 
E)  None of these choices is correct. 
A)  Al < In < N < P 
B)  Al < In < P < N 
C)  In < Al < P < N 
D)  In < P < Al < N 
E)  None of these choices is correct.

Question 20

The electrostatic energy of two charged particles is inversely proportional to the square of the distance between them.

Accepted Answer

A) True 
 B)False

Exam 9: Models of Chemical Bonding

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

The lattice energy is the energy released when separated ions in the gas phase combine to form ionic molecules in the gas phase.

Nitrogen and hydrogen combine to form ammonia in the Haber process. Calculate (in kJ) the standard enthalpy change ?H °\degree° for the reaction written below, using the bond energies given.

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

The diameter of a chloride ion is 362 pm, and the diameter of a potassium ion is 276 pm. What is the distance between the nuclei of adjacent chloride and potassium ions in solid potassium chloride?

Which one of the following properties is least characteristic of typical metals?

Select the correct formula for a compound formed from barium and nitrogen.

Using the bond energies provided below, calculate ?H °\degree° for the reaction Bond energies: C H = 413 kJ/mol, Cl Cl = 243 kJ/mol, C Cl = 339 kJ/mol, H Cl = 427 kJ/mol

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

Select the strongest bond in the following group.

Bond energy increases as bond order increases, for bonding between a given pair of atoms.

The lattice energy of CaF2 is the energy change for which one, if any, of the following processes?

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

Electronegativity is a measure of

Combustion of a fat will release more energy than combustion of an equal mass of carbohydrate because

When an atom is represented in a Lewis electron dot symbol, the element symbol represents the ______________ and the dots represent the ______________.

No real bonds are 100% ionic in character.

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

Arrange aluminum, nitrogen, phosphorus and indium in order of increasing electronegativity.

The electrostatic energy of two charged particles is inversely proportional to the square of the distance between them.

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three 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

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

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

The lattice energy of CaF₂ is the energy change for which one, if any, of the following processes?

When an atom is represented in a Lewis electron dot symbol, the element symbol represents the and the dots represent the .

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