Question 1

Ionic bonding typically occurs when a ______________ bonds with a ______________.

Accepted Answer

The answer of Ionic bonding typically occurs when a ______________...

Question 2

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 3

Arrange oxygen,sulfur,calcium,rubidium and potassium in order of decreasing electronegativity.

Accepted Answer

A) O > S > Ca > K > Rb 
B) O > S > Ca > Rb > K 
C) O > S > Rb > K > Ca 
D) O > S > Rb > Ca > K 
E) None of these orders is correct. 
A) O > S > Ca > K > Rb 
B) O > S > Ca > Rb > K 
C) O > S > Rb > K > Ca 
D) O > S > Rb > Ca > K 
E) None of these orders is correct.

Question 4

Covalently bonded substances do not necessarily exist as separate molecules.

Accepted Answer

A) True 
 B)False

Question 5

In which of these substances are the atoms held together by polar covalent bonding?

Accepted Answer

A) SrCl2 
B) CsCl 
C) ClF 
D) TiF2 
E) S8 
A) SrCl2 
B) CsCl 
C) ClF 
D) TiF2 
E) S8

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

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

Question 8

Based on electronegativity trends in the periodic table,predict which of the following compounds will have the greatest % ionic character in its bonds.

Accepted Answer

A) H2O 
B) LiI 
C) CaO 
D) RbF 
E) HCl 
A) H2O 
B) LiI 
C) CaO 
D) RbF 
E) HCl

Question 9

The majority of elements are good electrical conductors when in solid form.

Accepted Answer

A) True 
 B)False

Question 10

Select the element whose Lewis symbol is correct.

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e 
A) a 
B) b 
C) c 
D) d 
E) e

Question 11

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

Accepted Answer

Electronegativity measures an

Question 12

Analysis of an unknown substance showed that it has a high boiling point and is brittle.It is an insulator as a solid but conducts electricity when melted.Which of the following substances would have those characteristics?

Accepted Answer

A) HCl 
B) Al 
C) KBr 
D) SiF4 
E) I2 
A) HCl 
B) Al 
C) KBr 
D) SiF4 
E) I2

Question 13

Which of the following is an ionic compound?

Accepted Answer

A) H2S 
B) NH3 
C) I2 
D) KI 
E) CCl4 
A) H2S 
B) NH3 
C) I2 
D) KI 
E) CCl4

Question 14

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 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

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

Accepted Answer

A) Mg(s)+ Cl2(g) $\to$ MgCl2(s) 
B) Mg(g)+ 2Cl(g) $\to$MgCl2(s) 
C) Mg2+(s)+ 2Cl-(g) $\to$ MgCl2(g) 
D) Mg2+(g)+ 2Cl-(g) $\to$ MgCl2(s) 
E) MgCl2(aq) $\to$ MgCl2(s) 
A) Mg(s)+ Cl2(g) $\to$ MgCl2(s) 
B) Mg(g)+ 2Cl(g) $\to$MgCl2(s) 
C) Mg2+(s)+ 2Cl-(g) $\to$ MgCl2(g) 
D) Mg2+(g)+ 2Cl-(g) $\to$ MgCl2(s) 
E) MgCl2(aq) $\to$ MgCl2(s)

Question 17

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 18

Which of the following is a covalent compound?

Accepted Answer

A) Na2O 
B) CaCl2 
C) Cl2O 
D) CsCl 
E) Al2O3 
A) Na2O 
B) CaCl2 
C) Cl2O 
D) CsCl 
E) Al2O3

Question 19

Arrange the following bonds in order of increasing bond strength.

Accepted Answer

A) C-I < C-Br < C-Cl < C-F 
B) C-F < C-Cl < C-Br < C-I 
C) C-Br < C-I < C-Cl < C-F 
D) C-I < C-Br < C-F< C-Cl 
E) None of these orders is correct. 
A) C-I < C-Br < C-Cl < C-F 
B) C-F < C-Cl < C-Br < C-I 
C) C-Br < C-I < C-Cl < C-F 
D) C-I < C-Br < C-F< C-Cl 
E) None of these orders is correct.

Question 20

Select the compound with the lowest 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)

Exam 9: Models of Chemical Bonding

Ionic bonding typically occurs when a ______________ bonds with a ______________.

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

Arrange oxygen,sulfur,calcium,rubidium and potassium in order of decreasing electronegativity.

Covalently bonded substances do not necessarily exist as separate molecules.

In which of these substances are the atoms held together by polar covalent bonding?

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

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.

Based on electronegativity trends in the periodic table,predict which of the following compounds will have the greatest % ionic character in its bonds.

The majority of elements are good electrical conductors when in solid form.

Select the element whose Lewis symbol is correct.

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

Analysis of an unknown substance showed that it has a high boiling point and is brittle.It is an insulator as a solid but conducts electricity when melted.Which of the following substances would have those characteristics?

Which of the following is an ionic compound?

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.

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

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

Which of the following contains covalent bonds?

Which of the following is a covalent compound?

Arrange the following bonds in order of increasing bond strength.

Select the compound with the lowest lattice energy.

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 Solutions

The Main-Group Elements: Applying Principles of Bonding and Structure

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 Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Ionic bonding typically occurs when a bonds with a .

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