Question 1

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

Accepted Answer

Carbon and oxygen form single,double and triple bonds.The C=O bond in carbon monoxide is roughly three times as strong as the C-O single bond,while the C=O bond is about twice as strong as the single bond.The bond energy is approximately proportional to the bond order..

Question 2

Which of the following elements is the least electronegative?

Accepted Answer

A) Si 
B) Se 
C) S 
D) Sc 
E) Sr 
A) Si 
B) Se 
C) S 
D) Sc 
E) Sr E

Question 3

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 A

Question 4

Describe in brief how electronegativity values can be used to predict the percent ionic character of a bond between two atoms.

Accepted Answer

Take the electronegativity difference (@#LAT-DLM&E

Question 5

In not more than three sentences,describe the electron arrangement responsible for bonding in Cl2 molecules.

Accepted Answer

This is covalent bonding.The chlorine at

Question 6

The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.

Accepted Answer

A) True 
 B)False

Question 7

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

Accepted Answer

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

Question 8

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

Question 9

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

Accepted Answer

nucleus an

Question 10

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

Accepted Answer

A) True 
 B)False

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

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 13

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 14

Oxygen difluoride is an unstable molecule that reacts readily with water.Calculate the bond energy of the O-F bond using the standard enthalpy of reaction and the bond energy data provided.

Accepted Answer

The answer of Oxygen difluoride is an unstable molecule that...

Question 15

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 orders 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 orders is correct.

Question 16

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

Accepted Answer

A) CO2 
B) Si 
C) Br2 
D) S8 
E) Cr 
A) CO2 
B) Si 
C) Br2 
D) S8 
E) Cr

Question 17

Which of the following elements is the most electronegative?

Accepted Answer

A) S 
B) Ru 
C) Si 
D) Te 
E) Cs 
A) S 
B) Ru 
C) Si 
D) Te 
E) Cs

Question 18

Which of the following contains ionic bonding?

Accepted Answer

A) CO 
B) SrF2 
C) Al 
D) OCl2 
E) HCl 
A) CO 
B) SrF2 
C) Al 
D) OCl2 
E) HCl

Question 19

Which of the following elements is the most electronegative?

Accepted Answer

A) Ne 
B) Rb 
C) P 
D) I 
E) Cl 
A) Ne 
B) Rb 
C) P 
D) I 
E) Cl

Question 20

Nitrogen and hydrogen combine to form ammonia in the Haber process.Calculate (in kJ)the standard enthalpy change $\Delta$H° for the reaction written below,using the bond energies given.
 
Bond:
N$\equiv$N
H-H
N-H

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

Exam 9: Models of Chemical Bonding

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

Which of the following elements is the least electronegative?

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

Describe in brief how electronegativity values can be used to predict the percent ionic character of a bond between two atoms.

In not more than three sentences,describe the electron arrangement responsible for bonding in Cl2 molecules.

The lattice energy of large ions is greater in magnitude than that of small ions of the same charge.

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

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 ______________ and the dots represent ______________.

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

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

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

Electronegativity is a measure of

Oxygen difluoride is an unstable molecule that reacts readily with water.Calculate the bond energy of the O-F bond using the standard enthalpy of reaction and the bond energy data provided.

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

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

Which of the following elements is the most electronegative?

Which of the following contains ionic bonding?

Which of the following elements is the most electronegative?

Nitrogen and hydrogen combine to form ammonia in the Haber process.Calculate (in kJ)the standard enthalpy change Δ\DeltaΔ H° for the reaction written below,using the bond energies given. Bond: N ≡\equiv≡ N H-H N-H

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 Cl₂ molecules.

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 and the dots represent .