Question 1

Which statement provides the best description of a covalent bond?

Accepted Answer

A) A high electron density between two positively charged atomic nuclei serves to attract the nuclei to each other. 
B) The negative charge on one atom is attracted to the positive charge on a second atom. 
C) Two or more electrons are attracted to each other, thereby holding the atoms together. 
D) Two atomic nuclei are attracted to each other by the strong nuclear force. 
E) Two atomic nuclei are attracted to each other by the Coulomb force. 
A) A high electron density between two positively charged atomic nuclei serves to attract the nuclei to each other. 
B) The negative charge on one atom is attracted to the positive charge on a second atom. 
C) Two or more electrons are attracted to each other, thereby holding the atoms together. 
D) Two atomic nuclei are attracted to each other by the strong nuclear force. 
E) Two atomic nuclei are attracted to each other by the Coulomb force.

Question 2

Which of the following is a correct Lewis structure for HCO3F1F1F1S1F1F1F10?

Accepted Answer

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

Question 3

Which of the following single bonds would you predict to be the longest, based on atom position in the periodic table?

Accepted Answer

A) OF1F1F1S1F1F1F10O 
B) SF1F1F1S1F1F1F10S 
C) IF1F1F1S1F1F1F10I 
D) SiF1F1F1S1F1F1F10Si 
E) HF1F1F1S1F1F1F10H 
A) OF1F1F1S1F1F1F10O 
B) SF1F1F1S1F1F1F10S 
C) IF1F1F1S1F1F1F10I 
D) SiF1F1F1S1F1F1F10Si 
E) HF1F1F1S1F1F1F10H

Question 4

Indicate which of the following molecules has four shared electrons.

Accepted Answer

A) O2 
B) CO 
C) HI 
D) N2 
E) Cl2 
A) O2 
B) CO 
C) HI 
D) N2 
E) Cl2

Question 5

In general, resonance ________ electrons and ________ molecules.

Accepted Answer

A) delocalizes; stabilizes 
B) destabilizes; destabilizes 
C) localizes; stabilizes 
D) delocalizes; destabilizes 
E) localizes; destabilizes 
A) delocalizes; stabilizes 
B) destabilizes; destabilizes 
C) localizes; stabilizes 
D) delocalizes; destabilizes 
E) localizes; destabilizes

Question 6

Which group of elements is listed in order of increasing electronegativity?

Accepted Answer

A) F   F1F1F1S1F1F1F10Cl   F1F1F1S1F1F1F10Ge   F1F1F1S1F1F1F10Sn 
B) Rb   F1F1F1S1F1F1F10Ca   F1F1F1S1F1F1F10Sc   F1F1F1S1F1F1F10Cs 
C) Zr   F1F1F1S1F1F1F10V   F1F1F1S1F1F1F10Nb   F1F1F1S1F1F1F10Ta 
D) Sn   F1F1F1S1F1F1F10P   F1F1F1S1F1F1F10Cl   F1F1F1S1F1F1F10F 
E) Cl   F1F1F1S1F1F1F10Br   F1F1F1S1F1F1F10I   F1F1F1S1F1F1F10F 
A) F   F1F1F1S1F1F1F10Cl   F1F1F1S1F1F1F10Ge   F1F1F1S1F1F1F10Sn 
B) Rb   F1F1F1S1F1F1F10Ca   F1F1F1S1F1F1F10Sc   F1F1F1S1F1F1F10Cs 
C) Zr   F1F1F1S1F1F1F10V   F1F1F1S1F1F1F10Nb   F1F1F1S1F1F1F10Ta 
D) Sn   F1F1F1S1F1F1F10P   F1F1F1S1F1F1F10Cl   F1F1F1S1F1F1F10F 
E) Cl   F1F1F1S1F1F1F10Br   F1F1F1S1F1F1F10I   F1F1F1S1F1F1F10F

Question 7

Which of the following molecules does not contain a triple bond?

Accepted Answer

A) N2 
B) HCN 
C) C2H2 
D) SO2 
E) CO 
A) N2 
B) HCN 
C) C2H2 
D) SO2 
E) CO

Question 8

Rank the following species in order of increasing nitrogen-oxygen bond energy: NOF1F1F1S1F1F1F10, NO2F1F1F1S1F1F1F10, NO3F1F1F1S1F1F1F10.

Accepted Answer

In order from largest to small

Question 9

In addition to CO2, which of the gases in the atmosphere listed below can contribute to the greenhouse effect?

Accepted Answer

A) CH4 
B) N2 
C) O2 
D) Ar 
E) None of these gases can contribute to the greenhouse effect. 
A) CH4 
B) N2 
C) O2 
D) Ar 
E) None of these gases can contribute to the greenhouse effect.

Question 10

How many valence electrons are there in SF4?

Accepted Answer

A) 13 
B) 28 
C) 21 
D) 34 
E) 40 
A) 13 
B) 28 
C) 21 
D) 34 
E) 40

Question 11

Which of the following gases in the atmosphere does not contribute to the greenhouse effect?

Accepted Answer

A) CO2 
B) CO 
C) H2O 
D) CH4 
E) Ar 
A) CO2 
B) CO 
C) H2O 
D) CH4 
E) Ar

Question 12

How many total bonding pairs of electrons exist in a single resonance structure for NO3F1F1F1S1F1F1F10?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 8 
A) 1 
B) 2 
C) 3 
D) 4 
E) 8

Question 13

Explain why multiple Lewis structures are needed to describe some molecules.

Accepted Answer

For some molecules, such as ozone, O₃, an

Question 14

Do the vibrations of N2 and O2 molecules in the atmosphere absorb infrared radiation and contribute to the greenhouse effect? Explain why or why not.

Accepted Answer

NoF1F1F1S1F1F1F10 the vibrati

Question 15

Which molecule has the longest single bond?

Accepted Answer

A) H2 
B) HF 
C) HCl 
D) HBr 
E) HI 
A) H2 
B) HF 
C) HCl 
D) HBr 
E) HI

Question 16

Draw the Lewis structure of OCS.

Accepted Answer

The answer of Draw the Lewis structure of OCS....

Question 17

Which of the following is an example of a nonpolar covalent bond?

Accepted Answer

A) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10S 
B) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10N 
C) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10F 
D) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10C 
E) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10O 
A) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10S 
B) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10N 
C) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10F 
D) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10C 
E) C F1F1F1S1F1F1F10F1F1F1S1F1F1F10O

Question 18

Which of the following atoms can have an expanded octet?

Accepted Answer

A) S 
B) C 
C) N 
D) B 
E) Be 
A) S 
B) C 
C) N 
D) B 
E) Be

Question 19

Which structure for dinitrogen sulfide (NF1F1F1S1F1F1F10NF1F1F1S1F1F1F10S or NF1F1F1S1F1F1F10SF1F1F1S1F1F1F10N) is the more stable?

Accepted Answer

A) NF1F1F1S1F1F1F10NF1F1F1S1F1F1F10S, because the formal charges are all 0 
B) NF1F1F1S1F1F1F10NF1F1F1S1F1F1F10S, because the formal charges are smaller 
C) NF1F1F1S1F1F1F10SF1F1F1S1F1F1F10N, because the formal charges are smaller 
D) NF1F1F1S1F1F1F10SF1F1F1S1F1F1F10N, because the formal charges are all 0 
E) NF1F1F1S1F1F1F10SF1F1F1S1F1F1F10N, because it is symmetrical and the formal charges are the same for both N atoms 
A) NF1F1F1S1F1F1F10NF1F1F1S1F1F1F10S, because the formal charges are all 0 
B) NF1F1F1S1F1F1F10NF1F1F1S1F1F1F10S, because the formal charges are smaller 
C) NF1F1F1S1F1F1F10SF1F1F1S1F1F1F10N, because the formal charges are smaller 
D) NF1F1F1S1F1F1F10SF1F1F1S1F1F1F10N, because the formal charges are all 0 
E) NF1F1F1S1F1F1F10SF1F1F1S1F1F1F10N, because it is symmetrical and the formal charges are the same for both N atoms

Question 20

What is the formal charge of each atom (from left to right) in the following resonance structure of SN2?

Accepted Answer

A) 0, 0, 0 
B) (F1F1F1S1F1F1F101, F1F1F1S1F1F1F101, 0) 
C) (F1F1F1S1F1F1F102, F1F1F1S1F1F1F101, 0) 
D) (F1F1F1S1F1F1F102, F1F1F1S1F1F1F101, F1F1F1S1F1F1F101) 
E) (F1F1F1S1F1F1F101, F1F1F1S1F1F1F101, F1F1F1S1F1F1F101) 
A) 0, 0, 0 
B) (F1F1F1S1F1F1F101, F1F1F1S1F1F1F101, 0) 
C) (F1F1F1S1F1F1F102, F1F1F1S1F1F1F101, 0) 
D) (F1F1F1S1F1F1F102, F1F1F1S1F1F1F101, F1F1F1S1F1F1F101) 
E) (F1F1F1S1F1F1F101, F1F1F1S1F1F1F101, F1F1F1S1F1F1F101)

Exam 8: Chemical Bonds: What Makes a Gas a Greenhouse Gas

Which statement provides the best description of a covalent bond?

Which of the following is a correct Lewis structure for HCO3?

Which of the following single bonds would you predict to be the longest, based on atom position in the periodic table?

Indicate which of the following molecules has four shared electrons.

In general, resonance ________ electrons and ________ molecules.

Which group of elements is listed in order of increasing electronegativity?

Which of the following molecules does not contain a triple bond?

Rank the following species in order of increasing nitrogen-oxygen bond energy: NO, NO2, NO3.

In addition to CO2, which of the gases in the atmosphere listed below can contribute to the greenhouse effect?

How many valence electrons are there in SF4?

Which of the following gases in the atmosphere does not contribute to the greenhouse effect?

How many total bonding pairs of electrons exist in a single resonance structure for NO3?

Explain why multiple Lewis structures are needed to describe some molecules.

Do the vibrations of N2 and O2 molecules in the atmosphere absorb infrared radiation and contribute to the greenhouse effect? Explain why or why not.

Which molecule has the longest single bond?

Draw the Lewis structure of OCS.

Which of the following is an example of a nonpolar covalent bond?

Which of the following atoms can have an expanded octet?

Which structure for dinitrogen sulfide (NNS or NSN) is the more stable?

What is the formal charge of each atom (from left to right) in the following resonance structure of SN2?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: The Air We Breathe

A Quantum Model of Atoms: Waves and Particles

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Crystals, Alloys, and Polymers

Chemical Kinetics: Reactions in the Atmosphere

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acidbase Equilibria: Proton Transfer in Biological Systems

Additional Aqueous Equilibria: Chemistry and the Oceans

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: The Quest for Clean Energy

Nuclear Chemistry: Applications to Energy and Medicine

Organic and Biological Molecules: the Compounds of Life

The Main Group Elements: Life and the Periodic Table

Transition Metals: Biological and Medical Applications

Filters

Which of the following is a correct Lewis structure for HCO₃^?

In general, resonance electrons and molecules.

Rank the following species in order of increasing nitrogen-oxygen bond energy: NO^, NO₂^, NO₃^.

In addition to CO₂, which of the gases in the atmosphere listed below can contribute to the greenhouse effect?

How many valence electrons are there in SF₄?

How many total bonding pairs of electrons exist in a single resonance structure for NO₃^?

Do the vibrations of N₂ and O₂ molecules in the atmosphere absorb infrared radiation and contribute to the greenhouse effect? Explain why or why not.

What is the formal charge of each atom (from left to right) in the following resonance structure of SN₂?