Question 1

Predict the actual bond angles in SF3+ using the VSEPR theory.

Accepted Answer

A)  more than 120° 
B)  exactly 120° 
C)  between 109° and 120° 
D)  between 90° and 109° 
E)  less than 90° 
A)  more than 120° 
B)  exactly 120° 
C)  between 109° and 120° 
D)  between 90° and 109° 
E)  less than 90° D

Question 2

Draw all important resonance structures of the nitrate ion, NO3-

Accepted Answer

Question 3

What is the molecular shape of ClF4- as predicted by the VSEPR theory?

Accepted Answer

A)  square pyramidal 
B)  square planar 
C)  see-saw 
D)  octahedral 
E)  tetrahedral 
A)  square pyramidal 
B)  square planar 
C)  see-saw 
D)  octahedral 
E)  tetrahedral B

Question 4

According to VSEPR theory, a molecule with the general formula AX2 will have a ___ molecular shape.

Accepted Answer

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

Question 5

What is the molecular shape of SCl3F as predicted by the VSEPR theory?

Accepted Answer

A)  linear 
B)  bent 
C)  see-saw 
D)  T-shaped 
E)  trigonal pyramidal 
A)  linear 
B)  bent 
C)  see-saw 
D)  T-shaped 
E)  trigonal pyramidal

Question 6

What is the shape of the PF3 molecule? Explain your answer, using VSEPR theory.

Accepted Answer

The Lewis structure has a lone pair on t

Question 7

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 8

In a Lewis structure for a molecule or ion, the sum of the formal charges on the atoms is equal to the charge on the molecule or ion.

Accepted Answer

A) True 
 B)False

Question 9

In the COCl2 molecule, carbon is the central atom. Based on the best Lewis structure for COCl2, what is the formal charge on carbon?

Accepted Answer

A)  0 
B)  +1 
C)  -1 
D)  +2 
E)  -2 
A)  0 
B)  +1 
C)  -1 
D)  +2 
E)  -2

Question 10

Which of the following atoms can expand its valence shell when bonding?

Accepted Answer

A)  N 
B)  C 
C)  O 
D)  P 
E)  Al 
A)  N 
B)  C 
C)  O 
D)  P 
E)  Al

Question 11

Draw Lewis structures, showing all valence electrons, for the following species:
a. S2-
b. CO
c. SO2
d. CH3OH

Accepted Answer

A)11ec6d40_aba9_d0ba_9cd1_27df90ce31a5_

Question 12

List all possible molecular geometries (shapes) for a nonpolar molecule with the formula AX4.

Accepted Answer

A)  tetrahedral 
B)  seesaw 
C)  square planar 
D)  either tetrahedral or square planar 
E)  any of the above shapes 
A)  tetrahedral 
B)  seesaw 
C)  square planar 
D)  either tetrahedral or square planar 
E)  any of the above shapes

Question 13

Which of the following has no net dipole moment?

Accepted Answer

A)  N2O 
B)  NF3 
C)  H2Se 
D)  TeO3 
E)  CH3Cl 
A)  N2O 
B)  NF3 
C)  H2Se 
D)  TeO3 
E)  CH3Cl

Question 14

Which one of the following Lewis structures is definitely incorrect?

Accepted Answer

A)  NO   
B)  HCN   
C)  NO2-   
D)  SO32-   
E)  PCl5   
A)  NO   
B)  HCN   
C)  NO2-   
D)  SO32-   
E)  PCl5

Question 15

Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom is always first in the formula.)

Accepted Answer

A)  BrF3 
B)  H3O+ 
C)  PCl3 
D)  SO42- 
E)  SF4 
A)  BrF3 
B)  H3O+ 
C)  PCl3 
D)  SO42- 
E)  SF4

Question 16

In the following Lewis structure for phosphate, phosphorus has a formal charge of ____ and an oxidation number of ____.

Accepted Answer

A)  0, -3 
B)  0, 5 
C)  5, -3 
D)  5, 5 
E)  3, 5 
A)  0, -3 
B)  0, 5 
C)  5, -3 
D)  5, 5 
E)  3, 5

Question 17

Considering all the bonds in a molecule with trigonal bipyramidal geometry, what are the bond angles present?

Accepted Answer

A)  120° only 
B)  90° only 
C)  180° only 
D)  60° and 90° only 
E)  90°, 120°, and 180° 
A)  120° only 
B)  90° only 
C)  180° only 
D)  60° and 90° only 
E)  90°, 120°, and 180°

Question 18

A molecule which contains polar bonds will always have a dipole moment.

Accepted Answer

A) True 
 B)False

Question 19

In which one of the following is the best Lewis structure a resonance structure?

Accepted Answer

A)  SO3 
B)  BF3 
C)  I3- 
D)  SCO (C = central atom) 
E)  SO32- 
A)  SO3 
B)  BF3 
C)  I3- 
D)  SCO (C = central atom) 
E)  SO32-

Question 20

Use VSEPR theory to decide which one of the following molecules and ions will have a trigonal pyramidal geometry. (The central atom is always first in the formula.)

Accepted Answer

A)  PCl3 
B)  BF3 
C)  SO3 
D)  BrF3 
E)  CO32- 
A)  PCl3 
B)  BF3 
C)  SO3 
D)  BrF3 
E)  CO32-

Exam 10: The Shapes of Molecules

Predict the actual bond angles in SF3+ using the VSEPR theory.

Draw all important resonance structures of the nitrate ion, NO3-

What is the molecular shape of ClF4- as predicted by the VSEPR theory?

According to VSEPR theory, a molecule with the general formula AX2 will have a ___ molecular shape.

What is the molecular shape of SCl3F as predicted by the VSEPR theory?

What is the shape of the PF3 molecule? Explain your answer, using VSEPR theory.

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

In a Lewis structure for a molecule or ion, the sum of the formal charges on the atoms is equal to the charge on the molecule or ion.

In the COCl2 molecule, carbon is the central atom. Based on the best Lewis structure for COCl2, what is the formal charge on carbon?

Which of the following atoms can expand its valence shell when bonding?

Draw Lewis structures, showing all valence electrons, for the following species: a. S2- b. CO c. SO2 d. CH3OH

List all possible molecular geometries (shapes) for a nonpolar molecule with the formula AX4.

Which of the following has no net dipole moment?

Which one of the following Lewis structures is definitely incorrect?

Use VSEPR theory to decide which one of the following ions and molecules is likely to be planar. (The central atom is always first in the formula.)

In the following Lewis structure for phosphate, phosphorus has a formal charge of ____ and an oxidation number of ____.

Considering all the bonds in a molecule with trigonal bipyramidal geometry, what are the bond angles present?

A molecule which contains polar bonds will always have a dipole moment.

In which one of the following is the best Lewis structure a resonance structure?

Use VSEPR theory to decide which one of the following molecules and ions will have a trigonal pyramidal geometry. (The central atom is always first in the formula.)

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The 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

Models of Chemical Bonding

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

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 Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Predict the actual bond angles in SF₃⁺ using the VSEPR theory.

Draw all important resonance structures of the nitrate ion, NO₃^-

What is the molecular shape of ClF₄^-as predicted by the VSEPR theory?

According to VSEPR theory, a molecule with the general formula AX₂will have a ___ molecular shape.

What is the molecular shape of SCl₃F as predicted by the VSEPR theory?

What is the shape of the PF₃ molecule? Explain your answer, using VSEPR theory.

In the COCl₂ molecule, carbon is the central atom. Based on the best Lewis structure for COCl₂, what is the formal charge on carbon?

Draw Lewis structures, showing all valence electrons, for the following species: a. S^2- b. CO c. SO₂ d. CH₃OH

List all possible molecular geometries (shapes) for a nonpolar molecule with the formula AX₄.

In the following Lewis structure for phosphate, phosphorus has a formal charge of and an oxidation number of .