Question 1

Which one of the following is expected to exhibit resonance?

Accepted Answer

A) NH4+ 
B) HCN 
C) CO2 
D) NO2- 
A) NH4+ 
B) HCN 
C) CO2 
D) NO2-

Question 2

How many lone pairs are on the Br atom in BrF2-?

Accepted Answer

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

Question 3

What are the bond angles in the following molecular model of H3O+?

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 4

Which molecule has a central atom that uses the set of hybrid orbitals shown below to form bonds with the non-central atoms?

Accepted Answer

A) H2O 
B) CO2 
C) NO2- 
D) ICl2- 
A) H2O 
B) CO2 
C) NO2- 
D) ICl2-

Question 5

Assign formal charges to each atom in the resonance form for SOCl2 given below.

Accepted Answer

A) 0 for Cl,0 for S,and 0 for O 
B) 0 for Cl,+1 for S,and -1 for O 
C) -1 for Cl,+4 for S,and -2 for O 
D) -1 for Cl,-2 for S,and -2 for O 
A) 0 for Cl,0 for S,and 0 for O 
B) 0 for Cl,+1 for S,and -1 for O 
C) -1 for Cl,+4 for S,and -2 for O 
D) -1 for Cl,-2 for S,and -2 for O

Question 6

Which of the following best describes ICl2-? It has a molecular geometry that is

Accepted Answer

A) linear molecular shape with no lone pairs on the I atom. 
B) linear molecular shape with lone pairs on the I atom. 
C) non-linear molecular shape with no lone pairs on the I atom. 
D) non-linear molecular shape with lone pairs on the I atom. 
A) linear molecular shape with no lone pairs on the I atom. 
B) linear molecular shape with lone pairs on the I atom. 
C) non-linear molecular shape with no lone pairs on the I atom. 
D) non-linear molecular shape with lone pairs on the I atom.

Question 7

What is the molecular geometry of IF5?

Accepted Answer

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

Question 8

Electrostatic potential maps use color to portray the calculated electron distribution in a molecule.Atoms that are electron poor and carry a δ+ charge are shown in blue.Atoms that are electron rich and carry a δ- charge are shown in red.Atoms with little or no charge are shown in green.The electrostatic potential map of CH3Cl below should show

Accepted Answer

A) C blue and Cl red. 
B) C blue and Cl green. 
C) C green and Cl blue. 
D) C red and Cl blue. 
A) C blue and Cl red. 
B) C blue and Cl green. 
C) C green and Cl blue. 
D) C red and Cl blue.

Question 9

How many double and single bonds are in the resonance form for SO2 in which the formal charges on each atom are zero?

Accepted Answer

A) two single bonds and no double bonds 
B) one single bond and one double bond 
C) no single bonds and two double bonds 
D) Each of these is possible. 
A) two single bonds and no double bonds 
B) one single bond and one double bond 
C) no single bonds and two double bonds 
D) Each of these is possible.

Question 10

Electrostatic potential maps use color to portray the calculated electron distribution in a molecule.Atoms that are electron poor and carry a δ+ charge are shown in blue.Atoms that are electron rich and carry a δ- charge are shown in red.Atoms with little or no charge are shown in green.The electrostatic potential map of H2O below should show

Accepted Answer

A) H blue and O red. 
B) H blue and O green. 
C) H green and O blue. 
D) H red and O blue. 
A) H blue and O red. 
B) H blue and O green. 
C) H green and O blue. 
D) H red and O blue.

Question 11

Which of the following should be nonlinear?

Accepted Answer

A) only I 
B) only II 
C) only III 
D) II and III 
A) only I 
B) only II 
C) only III 
D) II and III

Question 12

What is the geometry around the central atom in the following molecular model of NO3-?

Accepted Answer

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

Question 13

How many of the σ bonds in H2SO4 are coordinate covalent bonds?

Accepted Answer

A) 0 
B) 2 
C) 4 
D) 6 
A) 0 
B) 2 
C) 4 
D) 6

Question 14

According to molecular orbital theory,is the highest energy orbital that contains an electron antibonding or bonding in O22- ?

Accepted Answer

Question 15

What are the bond angles in the following molecular model of PF6-?

Accepted Answer

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

Question 16

What orbital hybridization is expected for the central atom in a molecule with a trigonal planar geometry?

Accepted Answer

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

Question 17

A::A represents

Accepted Answer

A) a double bond. 
B) a quadruple bond. 
C) one lone pair of electrons. 
D) two lone pairs of electrons. 
A) a double bond. 
B) a quadruple bond. 
C) one lone pair of electrons. 
D) two lone pairs of electrons.

Question 18

Which electrostatic forces hold atoms together in a molecule?

Accepted Answer

A) electron-electron forces 
B) electron-nucleus forces 
C) nucleus-nucleus forces 
D) all three forces 
A) electron-electron forces 
B) electron-nucleus forces 
C) nucleus-nucleus forces 
D) all three forces

Question 19

Of H2CO and CO and CO2,the compound having the strongest C-O bond is ________.

Accepted Answer

Question 20

Identify the set of hybrid orbitals shown below.

Accepted Answer

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

Exam 7: Covalent Bonds and Molecular Structure

Which one of the following is expected to exhibit resonance?

How many lone pairs are on the Br atom in BrF2-?

What are the bond angles in the following molecular model of H3O+?

Which molecule has a central atom that uses the set of hybrid orbitals shown below to form bonds with the non-central atoms?

Assign formal charges to each atom in the resonance form for SOCl2 given below.

Which of the following best describes ICl2-? It has a molecular geometry that is

What is the molecular geometry of IF5?

How many double and single bonds are in the resonance form for SO2 in which the formal charges on each atom are zero?

Which of the following should be nonlinear?

What is the geometry around the central atom in the following molecular model of NO3-?

How many of the σ bonds in H2SO4 are coordinate covalent bonds?

According to molecular orbital theory,is the highest energy orbital that contains an electron antibonding or bonding in O22- ?

What are the bond angles in the following molecular model of PF6-?

What orbital hybridization is expected for the central atom in a molecule with a trigonal planar geometry?

A::A represents

Which electrostatic forces hold atoms together in a molecule?

Of H2CO and CO and CO2,the compound having the strongest C-O bond is ________.

Identify the set of hybrid orbitals shown below.

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

Organic and Biological Chemistry

Filters

How many lone pairs are on the Br atom in BrF₂^-?

What are the bond angles in the following molecular model of H₃O⁺?

Assign formal charges to each atom in the resonance form for SOCl₂ given below.

Which of the following best describes ICl₂^-? It has a molecular geometry that is

What is the molecular geometry of IF₅?

How many double and single bonds are in the resonance form for SO₂ in which the formal charges on each atom are zero?

What is the geometry around the central atom in the following molecular model of NO₃^-?

How many of the σ bonds in H₂SO₄ are coordinate covalent bonds?

According to molecular orbital theory,is the highest energy orbital that contains an electron antibonding or bonding in O₂^2-?

What are the bond angles in the following molecular model of PF₆^-?

Of H₂CO and CO and CO₂,the compound having the strongest C-O bond is ________.