Question 1

Which of the following is not a valence bond concept?

Accepted Answer

A) The greater the overlap between the orbitals on two atoms,the stronger the bond. 
B) Lone pair electrons are in atomic orbitals or in hybrid atomic orbitals. 
C) Atomic orbitals on two atoms may overlap to form antibonding orbitals. 
D) A pair of electrons in a bond is shared by both atoms. 
A) The greater the overlap between the orbitals on two atoms,the stronger the bond. 
B) Lone pair electrons are in atomic orbitals or in hybrid atomic orbitals. 
C) Atomic orbitals on two atoms may overlap to form antibonding orbitals. 
D) A pair of electrons in a bond is shared by both atoms.

Question 2

How many lone pairs of electrons are on the P atom in PF3?

Accepted Answer

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

Question 3

What is the geometry around the central atom in the following molecular model of SO2?

Accepted Answer

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

Question 4

What is the geometry around the central atom in the following molecular model of BrF3?

Accepted Answer

A) trigonal bipyramidal 
B) seesaw 
C) T-shaped 
D) linear 
A) trigonal bipyramidal 
B) seesaw 
C) T-shaped 
D) linear

Question 5

What is the geometry around the central atom in the following molecular model of SF6?

Accepted Answer

A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar 
A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar

Question 6

NO2- is be expected to have

Accepted Answer

A) two single bonds. 
B) one single and one double bond. 
C) two double bonds. 
D) two identical bonds intermediate between a single and a double bond. 
A) two single bonds. 
B) one single and one double bond. 
C) two double bonds. 
D) two identical bonds intermediate between a single and a double bond.

Question 7

The number of Lewis electron dot resonance structures required to describe NO2- is ________.

Accepted Answer

Question 8

The VSEPR model predicts the O-O-O bond angle in O3 to be

Accepted Answer

A) 90°. 
B) 109.5°. 
C) less than 120° but greater than 109.5°. 
D) 120°. 
A) 90°. 
B) 109.5°. 
C) less than 120° but greater than 109.5°. 
D) 120°.

Question 9

What are the bond angles in the following molecular model of CCl4?

Accepted Answer

A) less than 109.5° 
B) 109.5° 
C) less than 120° but greater than 109.5° 
D) 120° 
A) less than 109.5° 
B) 109.5° 
C) less than 120° but greater than 109.5° 
D) 120°

Question 10

Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0.Which statement best describes the bonding in A3B?

Accepted Answer

A) The AB bond is largely covalent with a δ- on A. 
B) The AB bond is largely covalent with a δ+ on A. 
C) The compound is largely ionic with A as the cation. 
D) The compound is largely ionic with A as the anion. 
A) The AB bond is largely covalent with a δ- on A. 
B) The AB bond is largely covalent with a δ+ on A. 
C) The compound is largely ionic with A as the cation. 
D) The compound is largely ionic with A as the anion.

Question 11

The following ball-and-stick molecular model is a representation of the amino acid alanine (unshaded spheres = H).Only the connections between atoms are shown;multiple bonds and nonbonded electrons are not indicated.  
-In order to complete an electron-dot structure of alanine,the oxygen atom labeled O1 needs

Accepted Answer

A) 1 additional bond and 1 nonbonded pair of electrons. 
B) 1 additional bond and 2 nonbonded pairs of electrons. 
C) 1 nonbonded pair of electrons. 
D) 2 nonbonded pairs of electrons. 
A) 1 additional bond and 1 nonbonded pair of electrons. 
B) 1 additional bond and 2 nonbonded pairs of electrons. 
C) 1 nonbonded pair of electrons. 
D) 2 nonbonded pairs of electrons.

Question 12

What is the hybridization of the oxygen atom labeled O1?

Accepted Answer

A) sp 
B) sp2 
C) sp3 
D) None of these 
A) sp 
B) sp2 
C) sp3 
D) None of these

Question 13

In which will the O-O bond be made stronger by removing an electron?

Accepted Answer

A) Only O2 
B) Only O2- 
C) Only O22- 
D) All of these 
A) Only O2 
B) Only O2- 
C) Only O22- 
D) All of these

Question 14

What is the geometry around the central atom in the following molecular model of PF5?

Accepted Answer

A) trigonal bipyramidal 
B) seesaw 
C) T-shaped 
D) linear 
A) trigonal bipyramidal 
B) seesaw 
C) T-shaped 
D) linear

Question 15

What are the bond angles in the following molecular model of PF5?

Accepted Answer

A) some less than 90° and one less than 180° 
B) 90° and 180° 
C) some less than 90° and some less than 120° but greater than 90°,and one less than 180° but greater than 120° 
D) 90°,120°,and 180° 
A) some less than 90° and one less than 180° 
B) 90° and 180° 
C) some less than 90° and some less than 120° but greater than 90°,and one less than 180° but greater than 120° 
D) 90°,120°,and 180°

Question 16

Compound A is a solid with a melting point of 125°C,and compound B is a gas at 25°C and one atmosphere pressure.Based on these data,one would expect

Accepted Answer

A) both compounds to be covalent. 
B) compound A to be ionic and compound B to be covalent. 
C) compound A to be covalent and compound B to be ionic. 
D) both compounds to be ionic. 
A) both compounds to be covalent. 
B) compound A to be ionic and compound B to be covalent. 
C) compound A to be covalent and compound B to be ionic. 
D) both compounds to be ionic.

Question 17

What is the geometry around the central atom in the following molecular model of TeF5-?

Accepted Answer

A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar 
A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar

Question 18

What is the smallest bond angle in SF6?

Accepted Answer

A) 60° 
B) 90° 
C) 109.5° 
D) 120° 
A) 60° 
B) 90° 
C) 109.5° 
D) 120°

Question 19

Which drawing represents the molecular orbital containing the highest energy electrons in the O2 molecule in its ground state?

Accepted Answer

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

Question 20

The MO diagram below is appropriate for B2.Based on this diagram,B2

Accepted Answer

A) has a bond order of one and is diamagnetic. 
B) has a bond order of one and is paramagnetic. 
C) has a bond order of two and is diamagnetic. 
D) has a bond order of two and is paramagnetic. 
A) has a bond order of one and is diamagnetic. 
B) has a bond order of one and is paramagnetic. 
C) has a bond order of two and is diamagnetic. 
D) has a bond order of two and is paramagnetic.

Exam 7: Covalent Bonds and Molecular Structure

Which of the following is not a valence bond concept?

How many lone pairs of electrons are on the P atom in PF3?

What is the geometry around the central atom in the following molecular model of SO2?

What is the geometry around the central atom in the following molecular model of BrF3?

What is the geometry around the central atom in the following molecular model of SF6?

NO2- is be expected to have

The number of Lewis electron dot resonance structures required to describe NO2- is ________.

The VSEPR model predicts the O-O-O bond angle in O3 to be

What are the bond angles in the following molecular model of CCl4?

Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0.Which statement best describes the bonding in A3B?

What is the hybridization of the oxygen atom labeled O1?

In which will the O-O bond be made stronger by removing an electron?

What is the geometry around the central atom in the following molecular model of PF5?

What are the bond angles in the following molecular model of PF5?

Compound A is a solid with a melting point of 125°C,and compound B is a gas at 25°C and one atmosphere pressure.Based on these data,one would expect

What is the geometry around the central atom in the following molecular model of TeF5-?

What is the smallest bond angle in SF6?

Which drawing represents the molecular orbital containing the highest energy electrons in the O2 molecule in its ground state?

The MO diagram below is appropriate for B2.Based on this diagram,B2

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

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Filters

How many lone pairs of electrons are on the P atom in PF₃?

What is the geometry around the central atom in the following molecular model of SO₂?

What is the geometry around the central atom in the following molecular model of BrF₃?

What is the geometry around the central atom in the following molecular model of SF₆?

NO₂^- is be expected to have

The number of Lewis electron dot resonance structures required to describe NO₂^- is ________.

The VSEPR model predicts the O-O-O bond angle in O₃ to be

What are the bond angles in the following molecular model of CCl₄?

Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0.Which statement best describes the bonding in A₃B?

What is the hybridization of the oxygen atom labeled O₁?

What is the geometry around the central atom in the following molecular model of PF₅?

What are the bond angles in the following molecular model of PF₅?

What is the geometry around the central atom in the following molecular model of TeF₅^-?

What is the smallest bond angle in SF₆?

Which drawing represents the molecular orbital containing the highest energy electrons in the O₂ molecule in its ground state?

The MO diagram below is appropriate for B₂.Based on this diagram,B₂