Question 1

Which one of the following properties is least characteristic of typical ionic compounds?

Accepted Answer

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

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

Select the most polar bond amongst the following.

Accepted Answer

A) C-O 
B) Si-F 
C) Cl-F 
D) C-F 
E) C-I 
A) C-O 
B) Si-F 
C) Cl-F 
D) C-F 
E) C-I

Question 4

Which one of the following properties is least characteristic of substances composed of small,covalently-bonded molecules?

Accepted Answer

A) low melting point 
B) low boiling point 
C) weak bonds 
D) poor electrical conductor when solid 
E) poor electrical conductor when molten 
A) low melting point 
B) low boiling point 
C) weak bonds 
D) poor electrical conductor when solid 
E) poor electrical conductor when molten

Question 5

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,

Question 6

No real bonds are 100% ionic in character.

Accepted Answer

A) True 
 B)False

Question 7

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 8

Select the strongest bond in the following group.

Accepted Answer

A) C-S 
B) C-O 
C) C=C 
D) C$\equiv$N 
E) C-F 
A) C-S 
B) C-O 
C) C=C 
D) C$\equiv$N 
E) C-F

Question 9

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 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

Select the compound with the highest lattice energy.

Accepted Answer

A) CaS(s) 
B) BaO(s) 
C) NaI(s) 
D) LiBr(s) 
E) MgO(s) 
A) CaS(s) 
B) BaO(s) 
C) NaI(s) 
D) LiBr(s) 
E) MgO(s)

Question 12

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

Accepted Answer

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

Question 13

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 14

Describe,with appropriate explanations,the key factors which affect the magnitude of the lattice energy of an ionic substance.

Accepted Answer

By Coulomb's law,the energy of two elect

Question 15

Hydrogenation of double and triple bonds is an important industrial process.Calculate (in kJ)the standard enthalpy change $\Delta$H° for the hydrogenation of ethyne (acetylene)to ethane.
 
Bond:
C-C
C$\equiv$C
C-H
H-H

Accepted Answer

A) -296 kJ 
B) -51 kJ 
C) 51 kJ 
D) 296 kJ 
E) 381 kJ 
A) -296 kJ 
B) -51 kJ 
C) 51 kJ 
D) 296 kJ 
E) 381 kJ

Question 16

Ethanol is sometimes used as an additive in oxygenated gasoline.Calculate its enthalpy of combustion using the bond energies given.

Accepted Answer

The answer of Ethanol is sometimes used as an additive...

Question 17

The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________.

Accepted Answer

A) increases,increases 
B) increases,decreases 
C) decreases,increases 
D) decreases,decreases 
E) None of these is generally correct. 
A) increases,increases 
B) increases,decreases 
C) decreases,increases 
D) decreases,decreases 
E) None of these is generally correct.

Question 18

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 halog

Question 19

For which of the following elements (in their normal,stable forms)would it be correct to describe the bonding as involving "electron pooling"?

Accepted Answer

A) hydrogen 
B) helium 
C) sulfur 
D) iodine 
E) aluminum 
A) hydrogen 
B) helium 
C) sulfur 
D) iodine 
E) aluminum

Question 20

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

Accepted Answer

A) True 
 B)False

Exam 9: Models of Chemical Bonding

Which one of the following properties is least characteristic of typical ionic compounds?

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

Select the most polar bond amongst the following.

Which one of the following properties is least characteristic of substances composed of small,covalently-bonded molecules?

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

No real bonds are 100% ionic in character.

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

Select the strongest bond in the following group.

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

Select the element whose Lewis symbol is correct.

Select the compound with the highest lattice energy.

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

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

Describe,with appropriate explanations,the key factors which affect the magnitude of the lattice energy of an ionic substance.

Hydrogenation of double and triple bonds is an important industrial process.Calculate (in kJ)the standard enthalpy change Δ\DeltaΔ H° for the hydrogenation of ethyne (acetylene)to ethane. Bond: C-C C ≡\equiv≡ C C-H H-H

Ethanol is sometimes used as an additive in oxygenated gasoline.Calculate its enthalpy of combustion using the bond energies given.

The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________.

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

For which of the following elements (in their normal,stable forms)would it be correct to describe the bonding as involving "electron pooling"?

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

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

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

Covalent bonding typically occurs when a bonds with a .

The lattice energy for ionic crystals increases as the charge on the ions _ and the size of the ions ______.