Question 1

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 2

In the electron dot structure of HCN,the bond order of CN is

Accepted Answer

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

Question 3

Which of the following contains an atom that does not obey the octet rule?

Accepted Answer

A) LiBr 
B) CO2 
C) PCl3 
D) CCl4 
A) LiBr 
B) CO2 
C) PCl3 
D) CCl4

Question 4

At the equilibrium bond length

Accepted Answer

A) the attractive forces holding the atoms together are less than the repulsive forces. 
B) the potential energy is a maximum. 
C) the potential energy is a minimum. 
D) the repulsive forces are greater than the attractive forces holding the atoms together. 
A) the attractive forces holding the atoms together are less than the repulsive forces. 
B) the potential energy is a maximum. 
C) the potential energy is a minimum. 
D) the repulsive forces are greater than the attractive forces holding the atoms together.

Question 5

In general,at room temperature

Accepted Answer

A) ionic compounds are all solids and covalent compounds are all gases. 
B) ionic compounds are all solids,but covalent compounds may be solids,liquids,or gases. 
C) ionic compounds are all solids,and covalent compounds are liquids or gases. 
D) covalent compounds are all gases,but ionic compounds may be solids,liquids,or gases. 
A) ionic compounds are all solids and covalent compounds are all gases. 
B) ionic compounds are all solids,but covalent compounds may be solids,liquids,or gases. 
C) ionic compounds are all solids,and covalent compounds are liquids or gases. 
D) covalent compounds are all gases,but ionic compounds may be solids,liquids,or gases.

Question 6

Elements that can accommodate more than eight electrons in their valence shell occur only in periodic table row

Accepted Answer

A) 2 or lower. 
B) 3 or lower. 
C) 4 or lower. 
D) 5 or lower. 
A) 2 or lower. 
B) 3 or lower. 
C) 4 or lower. 
D) 5 or lower.

Question 7

Which molecule contains the most easily broken carbon-carbon bond?

Accepted Answer

A) H3C-CH3 
B) H2C=CH2 
C) F2C=CF2 
D) HC  
CH 
A) H3C-CH3 
B) H2C=CH2 
C) F2C=CF2 
D) HC  
CH

Question 8

Based on the indicated electronegativities,arrange the following in order of increasing ionic character: CsBr,LaBr3,PBr3,MgBr2.

Accepted Answer

A) CsBr,LaBr3,MgBr2,PBr3 
B) CsBr,MgBr2,PBr3,LaBr3 
C) PBr3,LaBr3,MgBr2,CsBr 
D) PBr3,MgBr2,LaBr3,CsBr 
A) CsBr,LaBr3,MgBr2,PBr3 
B) CsBr,MgBr2,PBr3,LaBr3 
C) PBr3,LaBr3,MgBr2,CsBr 
D) PBr3,MgBr2,LaBr3,CsBr

Question 9

Using only the elements Mg,Cl,and/or P,give the formula of a compound having largely polar covalent bonds.

Accepted Answer

The answer of Using only the elements Mg,Cl,and/or P,give the...

Question 10

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 11

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

Accepted Answer

Question 12

In the best Lewis structure for CN -,what is the formal charge on the N atom?

Accepted Answer

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

Question 13

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

Accepted Answer

Question 14

Which of the following bonds is expected to be stronger?

Accepted Answer

A) C-C bond with a bond order of 0 
B) C-C bond with a bond order of 1 
C) C-C bond with a bond order of 2 
D) C-C bond with a bond order of 3 
A) C-C bond with a bond order of 0 
B) C-C bond with a bond order of 1 
C) C-C bond with a bond order of 2 
D) C-C bond with a bond order of 3

Question 15

In the best Lewis structure for CO2,what is the formal charge on the C atom?

Accepted Answer

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

Question 16

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 17

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 18

A molecular compound that obeys the octet rule in which all atoms have a zero formal charge is

Accepted Answer

A) SrBr2. 
B) BrF3. 
C) NH3. 
D) XeF4. 
A) SrBr2. 
B) BrF3. 
C) NH3. 
D) XeF4.

Question 19

Assign formal charges to all atoms in the following resonance form for HNO3.

Accepted Answer

A) 0 for all atoms 
B) +1 for N,-1 for oxygen (c),0 for all other atoms 
C) +1 for N and H,-1 for oxygen (a)and oxygen (c),0 for oxygen (b) 
D) +1 for H,-2 for each oxygen,+5 for N 
A) 0 for all atoms 
B) +1 for N,-1 for oxygen (c),0 for all other atoms 
C) +1 for N and H,-1 for oxygen (a)and oxygen (c),0 for oxygen (b) 
D) +1 for H,-2 for each oxygen,+5 for N

Question 20

Which compound is most likely to exist as a gas or liquid at room temperature?

Accepted Answer

A) Al4C3 
B) CBr4 
C) CaBr2 
D) WC 
A) Al4C3 
B) CBr4 
C) CaBr2 
D) WC

Exam 7: Covalent Bonding and Electron-Dot Structures

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

In the electron dot structure of HCN,the bond order of CN is

Which of the following contains an atom that does not obey the octet rule?

At the equilibrium bond length

In general,at room temperature

Elements that can accommodate more than eight electrons in their valence shell occur only in periodic table row

Which molecule contains the most easily broken carbon-carbon bond?

Based on the indicated electronegativities,arrange the following in order of increasing ionic character: CsBr,LaBr3,PBr3,MgBr2.

Using only the elements Mg,Cl,and/or P,give the formula of a compound having largely polar covalent bonds.

NO2- is be expected to have

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

In the best Lewis structure for CN -,what is the formal charge on the N atom?

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

Which of the following bonds is expected to be stronger?

In the best Lewis structure for CO2,what is the formal charge on the C atom?

A::A represents

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?

A molecular compound that obeys the octet rule in which all atoms have a zero formal charge is

Assign formal charges to all atoms in the following resonance form for HNO3.

Which compound is most likely to exist as a gas or liquid at room temperature?

Chemical Tools: Experimentation and Measurement

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Mass Relationships in Chemical Reactions

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Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Compounds: Bonding Theories and Molecular Structure

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

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Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

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Filters

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

Based on the indicated electronegativities,arrange the following in order of increasing ionic character: CsBr,LaBr₃,PBr₃,MgBr₂.

NO₂^- is be expected to have

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

In the best Lewis structure for CN^-,what is the formal charge on the N atom?

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

In the best Lewis structure for CO₂,what is the formal charge on the C atom?

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?

Assign formal charges to all atoms in the following resonance form for HNO₃.