Question 1

As the number of bonds between two carbon atoms increases,which of the following decrease(s)?

Accepted Answer

A) only the bond length 
B) only the bond energy 
C) only the number of electrons between the carbon atoms 
D) all of these 
E) none of these 
A) only the bond length 
B) only the bond energy 
C) only the number of electrons between the carbon atoms 
D) all of these 
E) none of these

Question 2

A bond in which an electron pair is unequally shared by two atoms is

Accepted Answer

A) polar covalent. 
B) coordinate covalent. 
C) ionic. 
D) nonpolar covalent. 
E) metallic. 
A) polar covalent. 
B) coordinate covalent. 
C) ionic. 
D) nonpolar covalent. 
E) metallic.

Question 3

Which pair of elements would form a covalent bond that is the least polar?

Accepted Answer

A) S and Li 
B) Al and N 
C) O and H 
D) O and F 
E) S and Cs 
A) S and Li 
B) Al and N 
C) O and H 
D) O and F 
E) S and Cs

Question 4

In the Lewis formula for phosphine,PH3,the number of lone pairs of electrons around the phosphorus atom is

Accepted Answer

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

Question 5

The Lewis formula of which species does not represent an exception to the octet rule?

Accepted Answer

A) XeF2 
B) SiF5- 
C) ICl2- 
D) BF3 
E) ClF 
A) XeF2 
B) SiF5- 
C) ICl2- 
D) BF3 
E) ClF

Question 6

What is the total number of valence electrons in the ammonium ion,NH4+ ?

Accepted Answer

A) 9 
B) 11 
C) 8 
D) 10 
E) 12 
A) 9 
B) 11 
C) 8 
D) 10 
E) 12

Question 7

For the resonance hybrid of the nitrite ion,   what is the average number of bonds between the nitrogen atom and an oxygen atom?

Accepted Answer

A) 3/2 
B) 1 
C) 4/3 
D) 2 
E) 5/3 
A) 3/2 
B) 1 
C) 4/3 
D) 2 
E) 5/3

Question 8

The following species,   ,  
,and  
,all have the same number of

Accepted Answer

A) electrons. 
B) nucleons. 
C) neutrons. 
D) protons. 
E) isotopes. 
A) electrons. 
B) nucleons. 
C) neutrons. 
D) protons. 
E) isotopes.

Question 9

The Lewis structure for each of the following except ____contains at least one double bond.

Accepted Answer

A) O2 
B) CS2 
C) C2H4 
D) NO+ 
E) N2H2 
A) O2 
B) CS2 
C) C2H4 
D) NO+ 
E) N2H2

Question 10

Atoms of an element X have the ground-state electron configuration 1s22s22p63s23p4.What type of ion is X most likely to form?

Accepted Answer

A) X6+ 
B) X3- 
C) X4+ 
D) X- 
E) X2- 
A) X6+ 
B) X3- 
C) X4+ 
D) X- 
E) X2-

Question 11

During the formation of a chemical bond between two hydrogen atoms,which of the following statements is always true?

Accepted Answer

A) Energy is released during the formation of the bond. 
B) A polar covalent bond is formed. 
C) Electrons always are between the nuclei of the atoms. 
D) One of the hydrogen atoms is ionized. 
E) Resonance stabilizes the bond. 
A) Energy is released during the formation of the bond. 
B) A polar covalent bond is formed. 
C) Electrons always are between the nuclei of the atoms. 
D) One of the hydrogen atoms is ionized. 
E) Resonance stabilizes the bond.

Question 12

What is the ground-state electron configuration of the zinc ion,Zn2+?

Accepted Answer

A) 1s22s22p63s23p63d104s24p2 
B) 1s22s22p63s23p63d104s2 
C) 1s22s22p63s23p63d84s2 
D) 1s22s22p63s23p63d10 
E) 1s22s22p63s23p64s2 
A) 1s22s22p63s23p63d104s24p2 
B) 1s22s22p63s23p63d104s2 
C) 1s22s22p63s23p63d84s2 
D) 1s22s22p63s23p63d10 
E) 1s22s22p63s23p64s2

Question 13

In which of the following species is resonance most likely to take place?

Accepted Answer

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

Question 14

The following representation of an atom is called
​

Accepted Answer

A) a Lewis dot structure. 
B) an ion. 
C) a structural formula. 
D) an electrostatic potential map. 
E) an ionic bond. 
A) a Lewis dot structure. 
B) an ion. 
C) a structural formula. 
D) an electrostatic potential map. 
E) an ionic bond.

Question 15

Which pair of species is isoelectronic?

Accepted Answer

A) Na+ and K+ 
B) K+ and Cl- 
C) Be2+ and Na+ 
D) Ne and Ar 
E) Li+ and Ne 
A) Na+ and K+ 
B) K+ and Cl- 
C) Be2+ and Na+ 
D) Ne and Ar 
E) Li+ and Ne

Question 16

Which of the following is the Lewis dot structure for the fluoride ion?

Accepted Answer

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

Question 17

Which of the following diatomic molecules has the greatest bond energy?

Accepted Answer

A) H2 
B) HCl 
C) Cl2 
D) CO 
E) HF 
A) H2 
B) HCl 
C) Cl2 
D) CO 
E) HF

Question 18

Which of the following bonds would be the least polar yet still be considered polar covalent?

Accepted Answer

A) Mg-O 
B) C-O 
C) Si-O 
D) O-O 
E) N-O 
A) Mg-O 
B) C-O 
C) Si-O 
D) O-O 
E) N-O

Question 19

Consider the reaction
2HCl(g)→ H2(g)+ Cl2(g); ΔH = 185 kJ
Which of the following statements is false?

Accepted Answer

A) The reaction is endothermic. 
B) HCl(g)has a negative enthalpy of formation. 
C) The products have more enthalpy than the reactants. 
D) The HCl bond is longer than either the H2 bond or the Cl2 bond. 
E) The bond order of each of the products is one. 
A) The reaction is endothermic. 
B) HCl(g)has a negative enthalpy of formation. 
C) The products have more enthalpy than the reactants. 
D) The HCl bond is longer than either the H2 bond or the Cl2 bond. 
E) The bond order of each of the products is one.

Question 20

Which of the following compounds would be expected to have the lowest melting point?

Accepted Answer

A) AlF3 
B) RbF 
C) NaF 
D) MgF2 
E) CaF2 
A) AlF3 
B) RbF 
C) NaF 
D) MgF2 
E) CaF2

Exam 9: Ionic and Covalent Bonding

As the number of bonds between two carbon atoms increases,which of the following decrease(s)?

A bond in which an electron pair is unequally shared by two atoms is

Which pair of elements would form a covalent bond that is the least polar?

In the Lewis formula for phosphine,PH3,the number of lone pairs of electrons around the phosphorus atom is

The Lewis formula of which species does not represent an exception to the octet rule?

What is the total number of valence electrons in the ammonium ion,NH4+ ?

For the resonance hybrid of the nitrite ion, what is the average number of bonds between the nitrogen atom and an oxygen atom?

The following species, , ,and ,all have the same number of

The Lewis structure for each of the following except ____contains at least one double bond.

Atoms of an element X have the ground-state electron configuration 1s22s22p63s23p4.What type of ion is X most likely to form?

During the formation of a chemical bond between two hydrogen atoms,which of the following statements is always true?

What is the ground-state electron configuration of the zinc ion,Zn2+?

In which of the following species is resonance most likely to take place?

The following representation of an atom is called ​

Which pair of species is isoelectronic?

Which of the following is the Lewis dot structure for the fluoride ion?

Which of the following diatomic molecules has the greatest bond energy?

Which of the following bonds would be the least polar yet still be considered polar covalent?

Consider the reaction 2HCl(g)→ H2(g)+ Cl2(g); ΔH = 185 kJ Which of the following statements is false?

Which of the following compounds would be expected to have the lowest melting point?

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Filters

In the Lewis formula for phosphine,PH₃,the number of lone pairs of electrons around the phosphorus atom is

What is the total number of valence electrons in the ammonium ion,NH₄⁺ ?

Atoms of an element X have the ground-state electron configuration 1s²2s²2p⁶3s²3p⁴.What type of ion is X most likely to form?

What is the ground-state electron configuration of the zinc ion,Zn²⁺?

The following representation of an atom is called

Consider the reaction 2HCl(g)→ H₂(g)+ Cl₂(g); ΔH = 185 kJ Which of the following statements is false?