Question 1

Which of the following has a molecular structure best described as involving an "incomplete octet"?

Accepted Answer

A) OF2  
B) BF3  
C) CF4  
D) NF3  
E) F2  
A) OF2  
B) BF3  
C) CF4  
D) NF3  
E) F2

Question 2

Choose the INCORRECT statement.

Accepted Answer

A) Molecules with unpaired electrons are paramagnetic. 
B) The bond order describes whether a covalent bond is single,double or triple. 
C) A larger bond order means a shorter bond length. 
D) Polar covalent bonds involve equal sharing of electrons in a bond. 
E) Bonds between like atoms share electrons equally. 
A) Molecules with unpaired electrons are paramagnetic. 
B) The bond order describes whether a covalent bond is single,double or triple. 
C) A larger bond order means a shorter bond length. 
D) Polar covalent bonds involve equal sharing of electrons in a bond. 
E) Bonds between like atoms share electrons equally.

Question 3

Which of the following is a bent (nonlinear)molecule?

Accepted Answer

A) CO2  
B) CS2  
C) BeF2  
D) OF2  
E) XeF2 
A) CO2  
B) CS2  
C) BeF2  
D) OF2  
E) XeF2

Question 4

A Lewis structure is a combination of Lewis symbols representing either the transfer or the sharing of electrons in a chemical bond.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following statements correctly describe the basic concepts and uses of VSEPR theory:
I.The VSEPR theory is used for estimating bond angles.
II.The VSEPR theory is used for predicting electronegativities.
III.The VSEPR theory is helpful in predicting polarity.
IV.The VSEPR theory states that electron pairs repel each other.
V.The VSEPR theory uses valence electron counting for structure prediction.

Accepted Answer

A) I,II,III,IV 
B) I,II,IV,V 
C) I,II,III,V 
D) II,III,IV,V 
E) I,III,IV,V 
A) I,II,III,IV 
B) I,II,IV,V 
C) I,II,III,V 
D) II,III,IV,V 
E) I,III,IV,V

Question 6

Which of the following sets contains only linear molecules?

Accepted Answer

A) CO2,HCN,O2  
B) H2S,HCN,CO2  
C) H2O,CO,Cl2  
D) H2S,CO,CO2  
E) BF3,Cl2,O2  
A) CO2,HCN,O2  
B) H2S,HCN,CO2  
C) H2O,CO,Cl2  
D) H2S,CO,CO2  
E) BF3,Cl2,O2

Question 7

Which of the following is least likely to form multiple bonds?

Accepted Answer

A) phosphorus 
B) oxygen 
C) nitrogen 
D) carbon 
E) barium 
A) phosphorus 
B) oxygen 
C) nitrogen 
D) carbon 
E) barium

Question 8

Which of the following molecules contains polar bonds but has a zero dipole moment?

Accepted Answer

A) N2  
B) NH3  
C) CO2  
D) CH3Cl 
E) BrCl 
A) N2  
B) NH3  
C) CO2  
D) CH3Cl 
E) BrCl

Question 9

After drawing the Lewis dot structure of HOClO2,pick the INCORRECT statement of the following.

Accepted Answer

A) The oxygen bonded to the hydrogen has two lone pairs. 
B) The oxygens not bonded to hydrogen have two lone pairs. 
C) The O-Cl bonds are all double bonds. 
D) The H-O bond is a single bond. 
E) Chlorine has an expanded octet. 
A) The oxygen bonded to the hydrogen has two lone pairs. 
B) The oxygens not bonded to hydrogen have two lone pairs. 
C) The O-Cl bonds are all double bonds. 
D) The H-O bond is a single bond. 
E) Chlorine has an expanded octet.

Question 10

Of the following elements,which has the highest electronegativity?

Accepted Answer

A) S 
B) Cl 
C) Ti 
D) Se 
A) S 
B) Cl 
C) Ti 
D) Se

Question 11

Given the bond enthalpies C =C (611),C  C (837),H-H (436),C-H (414)all in kJ/mol,estimate ΔH° for the following reaction: 
C2H2(g)+ H2(g)→ C2H4(g).

Accepted Answer

A) -60 kJ/mol 
B) -166 kJ/mol 
C) -994 kJ/mol 
D) +166 kJ/mol 
E) 98 kJ/mol 
A) -60 kJ/mol 
B) -166 kJ/mol 
C) -994 kJ/mol 
D) +166 kJ/mol 
E) 98 kJ/mol

Question 12

Choose the INCORRECT statement.

Accepted Answer

A) The core electrons are called valence electrons. 
B) Ionic bonds are formed by the attraction between cations and anions. 
C) Ionic bonds are formed from atoms by a transfer of electrons. 
D) Covalent bonds are formed by atoms sharing electrons. 
E) An octet is 8 outer-shell electrons. 
A) The core electrons are called valence electrons. 
B) Ionic bonds are formed by the attraction between cations and anions. 
C) Ionic bonds are formed from atoms by a transfer of electrons. 
D) Covalent bonds are formed by atoms sharing electrons. 
E) An octet is 8 outer-shell electrons.

Question 13

Choose the INCORRECT statement.

Accepted Answer

A) Molecules with all paired electrons are diamagnetic. 
B) Highly reactive molecular fragments with unpaired electrons are free radicals. 
C) An expanded octet has larger electron clouds. 
D) Electron pairs repel each other. 
E) VSEPR stands for valence-shell electron pair repulsion. 
A) Molecules with all paired electrons are diamagnetic. 
B) Highly reactive molecular fragments with unpaired electrons are free radicals. 
C) An expanded octet has larger electron clouds. 
D) Electron pairs repel each other. 
E) VSEPR stands for valence-shell electron pair repulsion.

Question 14

After drawing the Lewis dot structure for XeCl2,determine the number of single bond(s),double bond(s),and lone pair(s)on the central atom.

Accepted Answer

A) single bond(s)= 2,double bond(s)= 0,lone pair(s)= 2 
B) single bond(s)= 0,double bond(s)= 2,lone pair(s)= 0 
C) single bond(s)= 0,double bond(s)= 2,lone pair(s)= 1 
D) single bond(s)= 2,double bond(s)= 0,lone pair(s)= 3 
E) single bond(s)= 2,double bond(s)= 0,lone pair(s)= 0 
A) single bond(s)= 2,double bond(s)= 0,lone pair(s)= 2 
B) single bond(s)= 0,double bond(s)= 2,lone pair(s)= 0 
C) single bond(s)= 0,double bond(s)= 2,lone pair(s)= 1 
D) single bond(s)= 2,double bond(s)= 0,lone pair(s)= 3 
E) single bond(s)= 2,double bond(s)= 0,lone pair(s)= 0

Question 15

Given the listed average bond energies,calculate the enthalpy change for the production of 48g Of methanol by the reaction:
CO2(g)+ 3 H2(g)→ CH3OH(g)+ H2O(g)
C-O(360 kJ/mol)C =O(736 kJ/mol)H-H(436 kJ/mol)
H-O(464 kJ/mol)H-C(414 kJ/mol)

Accepted Answer

A) +214 kJ 
B) +639 kJ 
C) 0 kJ 
D) -214 kJ 
E) -108 kJ 
A) +214 kJ 
B) +639 kJ 
C) 0 kJ 
D) -214 kJ 
E) -108 kJ

Question 16

What is the bond order for the carbon-oxygen bond in formaldehyde (CH2O),which has no O-H bonds?

Accepted Answer

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

Question 17

What is the formal charge on P in PCl5?

Accepted Answer

A) +5 
B) +2 
C) +1 
D) 0 
E) -1 
A) +5 
B) +2 
C) +1 
D) 0 
E) -1

Question 18

The electron-group geometry of H2O is ________.

Accepted Answer

A) tetrahedral 
B) linear 
C) trigonal planar 
D) bent 
E) V-shaped 
A) tetrahedral 
B) linear 
C) trigonal planar 
D) bent 
E) V-shaped

Question 19

Which of the following molecules is nonpolar?

Accepted Answer

A) HCN 
B) CHCl3  
C) H2O 
D) HClO4  
E) BCl3  
A) HCN 
B) CHCl3  
C) H2O 
D) HClO4  
E) BCl3

Question 20

Which of the following is diamagnetic?

Accepted Answer

A) ClO2  
B) NO 
C) CO 
D) NO2  
E) CH3 
A) ClO2  
B) NO 
C) CO 
D) NO2  
E) CH3

Exam 10: Chemical Bonding I: Basic Concepts

Which of the following has a molecular structure best described as involving an "incomplete octet"?

Choose the INCORRECT statement.

Which of the following is a bent (nonlinear)molecule?

A Lewis structure is a combination of Lewis symbols representing either the transfer or the sharing of electrons in a chemical bond.

Which of the following sets contains only linear molecules?

Which of the following is least likely to form multiple bonds?

Which of the following molecules contains polar bonds but has a zero dipole moment?

After drawing the Lewis dot structure of HOClO2,pick the INCORRECT statement of the following.

Of the following elements,which has the highest electronegativity?

Given the bond enthalpies C =C (611),C C (837),H-H (436),C-H (414)all in kJ/mol,estimate ΔH° for the following reaction: C2H2(g)+ H2(g)→ C2H4(g).

Choose the INCORRECT statement.

Choose the INCORRECT statement.

After drawing the Lewis dot structure for XeCl2,determine the number of single bond(s),double bond(s),and lone pair(s)on the central atom.

Given the listed average bond energies,calculate the enthalpy change for the production of 48g Of methanol by the reaction: CO2(g)+ 3 H2(g)→ CH3OH(g)+ H2O(g) C-O(360 kJ/mol)C =O(736 kJ/mol)H-H(436 kJ/mol) H-O(464 kJ/mol)H-C(414 kJ/mol)

What is the bond order for the carbon-oxygen bond in formaldehyde (CH2O),which has no O-H bonds?

What is the formal charge on P in PCl5?

The electron-group geometry of H2O is ________.

Which of the following molecules is nonpolar?

Which of the following is diamagnetic?

Matter: Its Properties and Measurement

Atoms and the Atomic Theory

Chemical Compounds

Chemical Reactions

Introduction to Reactions in Aqueous Solutions

Gases

Thermochemistry

Electrons in Atoms

The Periodic Table and Some Atomic Properties

Chemical Bonding Ii: Valence Bond and Molecular Orbital Theories

Intermolecular Forces: Liquids and Solids

Spontaneous Change: Entropy and Gibbs Energy

Solutions and Their Physical Properties

Principles of Chemical Equilibrium

Acids and Bases

Additional Aspects of Acidbase Equilibria

Solubility and Complex-Ion Equilibria

Electrochemistry

Chemical Kinetics

Chemistry of the Main-Group Elements I: Groups 1,2,13,and 14

Chemistry of the Main-Group Elements Ii: Groups 18,17,16,15,and Hydrogen

The Transition Elements

Complex Ions and Coordination Compounds

Nuclear Chemistry

Structures of Organic Compounds

Reactions of Organic Compounds

Chemistry of the Living State

Filters

After drawing the Lewis dot structure of HOClO₂,pick the INCORRECT statement of the following.

Given the bond enthalpies C =C (611),C C (837),H-H (436),C-H (414)all in kJ/mol,estimate ΔH° for the following reaction: C₂H₂(g)+ H₂(g)→ C₂H₄(g).

After drawing the Lewis dot structure for XeCl_2,determine the number of single bond(s),double bond(s),and lone pair(s)on the central atom.

Given the listed average bond energies,calculate the enthalpy change for the production of 48g Of methanol by the reaction: CO₂(g)+ 3 H₂(g)→ CH₃OH(g)+ H₂O(g) C-O(360 kJ/mol)C =O(736 kJ/mol)H-H(436 kJ/mol) H-O(464 kJ/mol)H-C(414 kJ/mol)

What is the bond order for the carbon-oxygen bond in formaldehyde (CH₂O),which has no O-H bonds?

What is the formal charge on P in PCl₅?

The electron-group geometry of H₂O is ________.