Question 1

Which of the following statements concerning lattice energy is false?

Accepted Answer

A) It is often defined as the energy released when an ionic solid forms from its ions. 
B) MgO has a larger lattice energy than NaF. 
C) The lattice energy for a solid with 2+ and 2- ions should be two times that for a solid with 1+ and 1- ions. 
D) MgO has a larger lattice energy than LiF. 
E) All of these are true. 
A) It is often defined as the energy released when an ionic solid forms from its ions. 
B) MgO has a larger lattice energy than NaF. 
C) The lattice energy for a solid with 2+ and 2- ions should be two times that for a solid with 1+ and 1- ions. 
D) MgO has a larger lattice energy than LiF. 
E) All of these are true. C

Question 2

Stable molecules usually contain atoms that have filled __________ orbitals.

Accepted Answer

valence

Question 3

Consider the following molecules.
I.BFS1U1B13S1U1B0
II.CHBrS1U1B13S1U1B0 (C is the central atom)
III.BrS1U1B12S1U1B0
IV.XeClS1U1B12S1U1B0
V.CO
VI.SFS1U1B14S1U1B0
Select the molecule(s)that fit the given statement.
-These molecules have a zero net dipole moment.

Accepted Answer

A) III,V 
B) I,III,IV 
C) III,IV,V 
D) I,III,IV,VI 
E) none of them 
A) III,V 
B) I,III,IV 
C) III,IV,V 
D) I,III,IV,VI 
E) none of them B

Question 4

The bond angles about the carbon atom in the formaldehyde molecule,H2C=O,are about:

Accepted Answer

A) 120° 
B) 60° 
C) 109° 
D) 180° 
E) 90° 
A) 120° 
B) 60° 
C) 109° 
D) 180° 
E) 90°

Question 5

The molecular structure of XeF5+ is

Accepted Answer

A) trigonal bipyramidal 
B) square pyramidal 
C) distorted tetrahedral 
D) octahedral 
E) none of these 
A) trigonal bipyramidal 
B) square pyramidal 
C) distorted tetrahedral 
D) octahedral 
E) none of these

Question 6

As indicated by Lewis structures,which of the following species could probably not exist as a stable molecule?

Accepted Answer

A) NH3 
B) N2H2 
C) N2H4 
D) N2H6 
E) N2O4 
A) NH3 
B) N2H2 
C) N2H4 
D) N2H6 
E) N2O4

Question 7

According to VSEPR theory,which of the following species has a square planar molecular structure?

Accepted Answer

A) TeBr4 
B) BrF3 
C) IF5 
D) XeF4 
E) SCl2 
A) TeBr4 
B) BrF3 
C) IF5 
D) XeF4 
E) SCl2

Question 8

Which of the following arrangements is in order of increasing size?

Accepted Answer

A) Ga3+ > Ca2+ > K+ > Cl- > S2- 
B) S2- > Cl- > K+ > Ca2+ > Ga3+ 
C) Ga3+ > S2- > Ca2+ > Cl- > K+ 
D) Ga3+ > Ca2+ > S2- > Cl- > K+ 
E) Ga3+ > Ca2+ > S2- > K+ > Cl- 
A) Ga3+ > Ca2+ > K+ > Cl- > S2- 
B) S2- > Cl- > K+ > Ca2+ > Ga3+ 
C) Ga3+ > S2- > Ca2+ > Cl- > K+ 
D) Ga3+ > Ca2+ > S2- > Cl- > K+ 
E) Ga3+ > Ca2+ > S2- > K+ > Cl-

Question 9

The force between two bodies having identical electric charges

Accepted Answer

A) is a force of repulsion 
B) is a force of repulsion if the charges are negative,and one of attraction if they are positive 
C) increases as the bodies are moved further apart 
D) is independent of the distance between them 
E) is directly proportional to the distance between them 
A) is a force of repulsion 
B) is a force of repulsion if the charges are negative,and one of attraction if they are positive 
C) increases as the bodies are moved further apart 
D) is independent of the distance between them 
E) is directly proportional to the distance between them

Question 10

When electrons in a molecule are not found between a pair of atoms but move throughout the molecule,this is called

Accepted Answer

A) ionic bonding 
B) covalent bonding 
C) polar covalent bonding 
D) delocalization of the electrons 
E) a dipole moment 
A) ionic bonding 
B) covalent bonding 
C) polar covalent bonding 
D) delocalization of the electrons 
E) a dipole moment

Question 11

Select the correct molecular structure for the given species from the choices below:
-NI3

Accepted Answer

A) pyramidal 
B) tetrahedral 
C) square planar 
D) octahedral 
E) none of these 
A) pyramidal 
B) tetrahedral 
C) square planar 
D) octahedral 
E) none of these

Question 12

Which carbon in this molecule has tetrahedral bonding?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) all 
A) 1 
B) 2 
C) 3 
D) 4 
E) all

Question 13

Given the following information: 
 
Calculate the change in enthalpy for:
2Li(s)+ 2HBr(g)$\to$H2(g)+ 2LiBr(s)

Accepted Answer

A) 262 kJ 
B) -602 kJ 
C) -517 kJ 
D) -992 kJ 
E) none of these 
A) 262 kJ 
B) -602 kJ 
C) -517 kJ 
D) -992 kJ 
E) none of these

Question 14

The first electron affinity value for oxygen is _______ and the second electron affinity value is ________.

Accepted Answer

A) unfavorable (endothermic),favorable (exothermic) 
B) unfavorable (endothermic),unfavorable (endothermic) 
C) favorable (exothermic),favorable (exothermic) 
D) favorable (exothermic),unfavorable (endothermic) 
E) More information is needed. 
A) unfavorable (endothermic),favorable (exothermic) 
B) unfavorable (endothermic),unfavorable (endothermic) 
C) favorable (exothermic),favorable (exothermic) 
D) favorable (exothermic),unfavorable (endothermic) 
E) More information is needed.

Question 15

Select the correct molecular structure for the given species from the choices below:
-I3-

Accepted Answer

A) linear 
B) trigonal planar 
C) tetrahedral 
D) bent 
E) none of these 
A) linear 
B) trigonal planar 
C) tetrahedral 
D) bent 
E) none of these

Question 16

Which of the following has a Lewis structure most like that of CO32-?

Accepted Answer

A) CO2 
B) SO32- 
C) NO3- 
D) O3 
E) NO2 
A) CO2 
B) SO32- 
C) NO3- 
D) O3 
E) NO2

Question 17

Select the correct molecular structure for the given species from the choices below:
-CO2

Accepted Answer

A) linear 
B) trigonal planar 
C) tetrahedral 
D) bent 
E) none of these 
A) linear 
B) trigonal planar 
C) tetrahedral 
D) bent 
E) none of these

Question 18

The __________ is the change in energy that takes place when separated gaseous ions are packed together to form an ionic solid.

Accepted Answer

The answer of The __________ is the change in energy...

Question 19

The Cl-Kr-Cl bond angle in KrCl4 is closest to

Accepted Answer

A) 90° 
B) 109° 
C) 120° 
D) 150° 
E) 360° 
A) 90° 
B) 109° 
C) 120° 
D) 150° 
E) 360°

Question 20

Which of the following statements is false?

Accepted Answer

A) Models are human interpretations,not the same as reality. 
B) Models are often wrong. 
C) Models usually start out simple and become more complex over time. 
D) We often learn more when a model is wrong than when it is right. 
E) A model should be discarded when any exception to it is found. 
A) Models are human interpretations,not the same as reality. 
B) Models are often wrong. 
C) Models usually start out simple and become more complex over time. 
D) We often learn more when a model is wrong than when it is right. 
E) A model should be discarded when any exception to it is found.

Exam 8: Bonding: General Concepts

Which of the following statements concerning lattice energy is false?

Stable molecules usually contain atoms that have filled __________ orbitals.

Consider the following molecules. I.BF3 II.CHBr3 (C is the central atom) III.Br2 IV.XeCl2 V.CO VI.SF4 Select the molecule(s)that fit the given statement. -These molecules have a zero net dipole moment.

The bond angles about the carbon atom in the formaldehyde molecule,H2C=O,are about:

The molecular structure of XeF5+ is

As indicated by Lewis structures,which of the following species could probably not exist as a stable molecule?

According to VSEPR theory,which of the following species has a square planar molecular structure?

Which of the following arrangements is in order of increasing size?

The force between two bodies having identical electric charges

When electrons in a molecule are not found between a pair of atoms but move throughout the molecule,this is called

Select the correct molecular structure for the given species from the choices below: -NI3

Which carbon in this molecule has tetrahedral bonding?

Given the following information: Calculate the change in enthalpy for: 2Li(s)+ 2HBr(g) →\to→ H2(g)+ 2LiBr(s)

The first electron affinity value for oxygen is _______ and the second electron affinity value is ________.

Select the correct molecular structure for the given species from the choices below: -I3-

Which of the following has a Lewis structure most like that of CO32-?

Select the correct molecular structure for the given species from the choices below: -CO2

The __________ is the change in energy that takes place when separated gaseous ions are packed together to form an ionic solid.

The Cl-Kr-Cl bond angle in KrCl4 is closest to

Which of the following statements is false?

Chemical Foundations

Atoms, molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Thermochemistry

Atomic Structure and Periodicity

Covalent Bonding: Orbitals

Liquids and Solids

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex Ion Equilibria

Spontaneity, entropy, and Free Energy

Electrochemistry

The Nucleus: a Chemists View

The Representative Elements

Transition Metals and Coordination Chemistry

Organic and Biological Molecules

Filters

Consider the following molecules. I.BF₃ II.CHBr₃ (C is the central atom) III.Br₂ IV.XeCl₂ V.CO VI.SF₄ Select the molecule(s)that fit the given statement. -These molecules have a zero net dipole moment.

The bond angles about the carbon atom in the formaldehyde molecule,H₂C=O,are about:

The molecular structure of XeF₅⁺ is

Select the correct molecular structure for the given species from the choices below: -NI₃

Given the following information: $Given the following information: Calculate the change in enthalpy for: 2Li(s)+ 2HBr(g) \to H<sub>2</sub>(g)+ 2LiBr(s)$ Calculate the change in enthalpy for: 2Li(s)+ 2HBr(g) $\to$ H₂(g)+ 2LiBr(s)

The first electron affinity value for oxygen is _ and the second electron affinity value is __.

Select the correct molecular structure for the given species from the choices below: -I₃^-

Which of the following has a Lewis structure most like that of CO₃²^-?

Select the correct molecular structure for the given species from the choices below: -CO₂

The Cl-Kr-Cl bond angle in KrCl₄ is closest to