Question 1

Helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through

Accepted Answer

A) dipole-dipole forces. 
B) ion-dipole forces. 
C) dispersion forces. 
D) dipole-induced dipole forces. 
E) hydrogen bonding. 
A) dipole-dipole forces. 
B) ion-dipole forces. 
C) dispersion forces. 
D) dipole-induced dipole forces. 
E) hydrogen bonding.

Question 2

Which pair of Lewis structures is not a pair of resonance structures?

Accepted Answer

A)    
B)    
C)   
D) All of these pairs are resonance structures of the same species. 
E) None of these pairs is resonance structures of the same species. 
A)    
B)    
C)   
D) All of these pairs are resonance structures of the same species. 
E) None of these pairs is resonance structures of the same species.

Question 3

Place the following in order of increasing electronegativity. N As K Ca

Accepted Answer

A) K < Ca < N < As 
B) N < As < Ca < K 
C) As < Ca < K < N 
D) N < K < Ca < As 
E) K < Ca < As < N 
A) K < Ca < N < As 
B) N < As < Ca < K 
C) As < Ca < K < N 
D) N < K < Ca < As 
E) K < Ca < As < N

Question 4

How many lone pairs of electrons need to be added to complete this Lewis structure?

Accepted Answer

A) 5 
B) 10 
C) 0 
D) 1 
E) 6 
A) 5 
B) 10 
C) 0 
D) 1 
E) 6

Question 5

In which one of the following species is the central atom (the first atom in the formula) likely to violate the octet rule?

Accepted Answer

A) BF4− 
B) XeO3 
C) SiCl4 
D) NH3 
E) CH2Cl2 
A) BF4− 
B) XeO3 
C) SiCl4 
D) NH3 
E) CH2Cl2

Question 6

The total number of bonding electrons in a molecule of formaldehyde (H2CO) is

Accepted Answer

A) 3. 
B) 4. 
C) 6. 
D) 8. 
E) 18. 
A) 3. 
B) 4. 
C) 6. 
D) 8. 
E) 18.

Question 7

According to the VSEPR model, what is the predicted Cl-C-Cl bond angle in CCl4?

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 145° 
E) 180° 
A) 90° 
B) 109.5° 
C) 120° 
D) 145° 
E) 180°

Question 8

According to the VSEPR model, which molecule is predicted to be linear?

Accepted Answer

A) H2S 
B) HCN 
C) BF3 
D) H2CO 
E) SO3 
A) H2S 
B) HCN 
C) BF3 
D) H2CO 
E) SO3

Question 9

Which of these choices is the best Lewis structure for ozone, O3?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 10

Which is the most reasonable prediction for the H-O-H bond angle in H2O?

Accepted Answer

A) 90° 
B) 109.5° 
C) 120° 
D) 107° 
E) 105° 
A) 90° 
B) 109.5° 
C) 120° 
D) 107° 
E) 105°

Question 11

The total number of lone pairs in NCl3 is

Accepted Answer

A) 6. 
B) 8. 
C) 9. 
D) 10. 
E) 13. 
A) 6. 
B) 8. 
C) 9. 
D) 10. 
E) 13.

Question 12

What is the molecular geometry of the thiocyanate anion, SCN−, as predicted by the VSEPR model? (Carbon is the central atom.)

Accepted Answer

A) linear 
B) bent 
C) tetrahedral 
D) trigonal planar 
E) trigonal pyramidal 
A) linear 
B) bent 
C) tetrahedral 
D) trigonal planar 
E) trigonal pyramidal

Question 13

The Lewis structure for a chlorate ion, ClO3-, should show ____ single bond(s), ____ double bond(s), and ____ lone pair(s).

Accepted Answer

A) 2, 1, 10 
B) 3, 0, 9 
C) 2, 1, 8 
D) 3, 0, 10 
E) 2, 1, 9 
A) 2, 1, 10 
B) 3, 0, 9 
C) 2, 1, 8 
D) 3, 0, 10 
E) 2, 1, 9

Question 14

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

Accepted Answer

A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) none of these 
A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) none of these

Question 15

How many total resonance structures can be drawn for the sulfate ion, SO42−?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 6 
A) 2 
B) 3 
C) 4 
D) 5 
E) 6

Question 16

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO2?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 0 
E) 4 
A) 1 
B) 2 
C) 3 
D) 0 
E) 4

Question 17

Predict the molecular geometry and polarity of the CS2 molecule.

Accepted Answer

A) linear, polar 
B) linear, nonpolar 
C) tetrahedral, nonpolar 
D) bent, nonpolar 
E) bent, polar 
A) linear, polar 
B) linear, nonpolar 
C) tetrahedral, nonpolar 
D) bent, nonpolar 
E) bent, polar

Question 18

Ammonia's unusually high melting point is the result of

Accepted Answer

A) dipole-dipole forces. 
B) London dispersion forces. 
C) hydrogen bonding. 
D) covalent bonding. 
E) ionic bonding. 
A) dipole-dipole forces. 
B) London dispersion forces. 
C) hydrogen bonding. 
D) covalent bonding. 
E) ionic bonding.

Question 19

According to the VSEPR model, the molecular geometry of the carbonate ion, CO32−, is

Accepted Answer

A) square planar. 
B) tetrahedral. 
C) pyramidal. 
D) trigonal planar. 
E) octahedral. 
A) square planar. 
B) tetrahedral. 
C) pyramidal. 
D) trigonal planar. 
E) octahedral.

Question 20

According to the VSEPR model, a molecule with the general formula AB3 with no lone pairs on the central atom will have a ______ molecular shape.

Accepted Answer

A) linear 
B) bent 
C) trigonal planar 
D) tetrahedral 
E) trigonal pyramidal 
A) linear 
B) bent 
C) trigonal planar 
D) tetrahedral 
E) trigonal pyramidal

Helium atoms do not combine to form He₂ molecules, yet He atoms do attract one another weakly through

Which pair of Lewis structures is not a pair of resonance structures?

Place the following in order of increasing electronegativity. N As K Ca

How many lone pairs of electrons need to be added to complete this Lewis structure?

In which one of the following species is the central atom (the first atom in the formula) likely to violate the octet rule?

The total number of bonding electrons in a molecule of formaldehyde (H₂CO) is

According to the VSEPR model, what is the predicted Cl-C-Cl bond angle in CCl₄?

According to the VSEPR model, which molecule is predicted to be linear?

Which of these choices is the best Lewis structure for ozone, O₃?

Which is the most reasonable prediction for the H-O-H bond angle in H₂O?

The total number of lone pairs in NCl₃ is

What is the molecular geometry of the thiocyanate anion, SCN⁻, as predicted by the VSEPR model? (Carbon is the central atom.)

The Lewis structure for a chlorate ion, ClO₃^-, should show single bond(s), double bond(s), and lone pair(s).

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

How many total resonance structures can be drawn for the sulfate ion, SO₄²⁻?

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO₂?

Predict the molecular geometry and polarity of the CS₂ molecule.

Ammonia's unusually high melting point is the result of

According to the VSEPR model, the molecular geometry of the carbonate ion, CO₃²⁻, is

According to the VSEPR model, a molecule with the general formula AB₃ with no lone pairs on the central atom will have a ______ molecular shape.

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Exam 6: Molecular Shape

Helium atoms do not combine to form He2 molecules, yet He atoms do attract one another weakly through

Which pair of Lewis structures is not a pair of resonance structures?

Place the following in order of increasing electronegativity. N As K Ca

How many lone pairs of electrons need to be added to complete this Lewis structure?

In which one of the following species is the central atom (the first atom in the formula) likely to violate the octet rule?

The total number of bonding electrons in a molecule of formaldehyde (H2CO) is

According to the VSEPR model, what is the predicted Cl-C-Cl bond angle in CCl4?

According to the VSEPR model, which molecule is predicted to be linear?

Which of these choices is the best Lewis structure for ozone, O3?

Which is the most reasonable prediction for the H-O-H bond angle in H2O?

The total number of lone pairs in NCl3 is

What is the molecular geometry of the thiocyanate anion, SCN−, as predicted by the VSEPR model? (Carbon is the central atom.)

The Lewis structure for a chlorate ion, ClO3-, should show ____ single bond(s), ____ double bond(s), and ____ lone pair(s).

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

How many total resonance structures can be drawn for the sulfate ion, SO42−?

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO2?

Predict the molecular geometry and polarity of the CS2 molecule.

Ammonia's unusually high melting point is the result of

According to the VSEPR model, the molecular geometry of the carbonate ion, CO32−, is

According to the VSEPR model, a molecule with the general formula AB3 with no lone pairs on the central atom will have a ______ molecular shape.

Atoms and Elements

Electrons and the Periodic Table

Compounds and Chemical Bonds

How Chemists Use Numbers

The Mole and Chemical Formulas

Solids, Liquids, and Phase Changes

Gases

Physical Properties of Solutions

Chemical Reactions and Chemical Equations

Using Balanced Chemical Equations

Acids and Bases

Equilibrium

Organic Chemistry

Biochemistry

Nuclear Chemistry

Electrochemistry

Filters

Helium atoms do not combine to form He₂ molecules, yet He atoms do attract one another weakly through

The total number of bonding electrons in a molecule of formaldehyde (H₂CO) is

According to the VSEPR model, what is the predicted Cl-C-Cl bond angle in CCl₄?

Which of these choices is the best Lewis structure for ozone, O₃?

Which is the most reasonable prediction for the H-O-H bond angle in H₂O?

The total number of lone pairs in NCl₃ is

What is the molecular geometry of the thiocyanate anion, SCN⁻, as predicted by the VSEPR model? (Carbon is the central atom.)

The Lewis structure for a chlorate ion, ClO₃^-, should show single bond(s), double bond(s), and lone pair(s).

How many total resonance structures can be drawn for the sulfate ion, SO₄²⁻?

What is the number of lone electron pairs on the central atom of a molecule having a linear molecular geometry, such as CO₂?

Predict the molecular geometry and polarity of the CS₂ molecule.

According to the VSEPR model, the molecular geometry of the carbonate ion, CO₃²⁻, is

According to the VSEPR model, a molecule with the general formula AB₃ with no lone pairs on the central atom will have a ______ molecular shape.