Question 1

How many lone pairs of electrons are on the Xe atom in XeFS1U1B16S1U1B0?

Accepted Answer

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

Question 2

The greater the electronegativity difference between two bonded atoms,the

Accepted Answer

A) greater the bond order. 
B) greater the covalent character of the bond. 
C) greater the ionic character of the bond. 
D) more unstable the bond. 
A) greater the bond order. 
B) greater the covalent character of the bond. 
C) greater the ionic character of the bond. 
D) more unstable the bond. C

Question 3

The electronegativity is 2.1 for H and 3.0 for N.Based on these electronegativities,NH4+ would be expected to

Accepted Answer

A) be ionic and contain H- ions. 
B) be ionic and contain H+ ions. 
C) have polar covalent bonds with a partial negative charges on the H atoms. 
D) have polar covalent bonds with a partial positive charges on the H atoms. 
A) be ionic and contain H- ions. 
B) be ionic and contain H+ ions. 
C) have polar covalent bonds with a partial negative charges on the H atoms. 
D) have polar covalent bonds with a partial positive charges on the H atoms. C

Question 4

How many resonance structures are required in the electron-dot structure of CO32-?

Accepted Answer

A) two 
B) three 
C) four 
D) five 
A) two 
B) three 
C) four 
D) five

Question 5

Classify bonds in As4 as largely ionic,nonpolar covalent,or polar covalent.

Accepted Answer

Question 6

Identify the fourth-row element X that forms the ion.

Accepted Answer

A) Ge 
B) As 
C) Se 
D) Kr 
A) Ge 
B) As 
C) Se 
D) Kr

Question 7

Ionic compounds consist of a single three-dimensional network of ions that are attracted to one another by strong ________ and usually exist in the solid state at room temperature,whereas covalent compounds consist of molecules that are attracted to one another by weak ________ and can exist in gaseous,liquid,or solid state at room temperature.

Accepted Answer

ionic bond

Question 8

Which electrostatic forces hold atoms together in a molecule?

Accepted Answer

A) electron-electron forces 
B) electron-nucleus forces 
C) nucleus-nucleus forces 
D) all three forces 
A) electron-electron forces 
B) electron-nucleus forces 
C) nucleus-nucleus forces 
D) all three forces

Question 9

Using only the elements Be,Cl,and/or P,give the formula of a compound having largely ionic bonds.

Accepted Answer

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

Question 10

Classify bonds in BeS as largely ionic,nonpolar covalent,or polar covalent.

Accepted Answer

The answer of Classify bonds in BeS as largely ionic,nonpolar...

Question 11

Which is expected to have the strongest C-O bond?

Accepted Answer

A) CH3OH  
B) Cl2CO 
C) CF3CO2- 
D) CO32- 
A) CH3OH  
B) Cl2CO 
C) CF3CO2- 
D) CO32-

Question 12

Which molecule contains a triple bond?

Accepted Answer

A) O2 
B) O3 
C) HCCH 
D) Br2SO 
A) O2 
B) O3 
C) HCCH 
D) Br2SO

Question 13

How many double and single bonds are in the resonance form for SO2 in which the formal charges on each atom are zero?

Accepted Answer

A) two single bonds and no double bonds 
B) one single bond and one double bond 
C) no single bonds and two double bonds 
D) Each of these is possible. 
A) two single bonds and no double bonds 
B) one single bond and one double bond 
C) no single bonds and two double bonds 
D) Each of these is possible.

Question 14

Of the following elements,which has the lowest electronegativity?

Accepted Answer

A) Sn 
B) As 
C) S 
D) Tl 
A) Sn 
B) As 
C) S 
D) Tl

Question 15

The Lewis electron-dot structure of N2 has ________ nonbonding electrons pairs,________ bonding electron pairs,and a bond order of ________.

Accepted Answer

Question 16

Assign formal charges to each atom in the resonance form for SOCl2 given below.

Accepted Answer

A) 0 for Cl,0 for S,and 0 for O 
B) 0 for Cl,+1 for S,and -1 for O 
C) -1 for Cl,+4 for S,and -2 for O 
D) -1 for Cl,-2 for S,and -2 for O 
A) 0 for Cl,0 for S,and 0 for O 
B) 0 for Cl,+1 for S,and -1 for O 
C) -1 for Cl,+4 for S,and -2 for O 
D) -1 for Cl,-2 for S,and -2 for O

Question 17

Which electron dot structure for OCN- has a formal charge of -1 on the most electronegative atom?

Accepted Answer

A) [:  
= C =
  
:] - 
B) [: N  
C -
  
:] - 
C) [:  
- C
  
O :] - 
D) [:  
- O
  
C :] - 
A) [:  
= C =
  
:] - 
B) [: N  
C -
  
:] - 
C) [:  
- C
  
O :] - 
D) [:  
- O
  
C :] -

Question 18

What is the bond order of the O-O bond in O2?

Accepted Answer

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

Question 19

The phosphorus atom in PCl5 would be expected to have a

Accepted Answer

A) partial positive (δ+)charge. 
B) partial negative (δ-)charge. 
C) 3+ charge. 
D) 3- charge. 
A) partial positive (δ+)charge. 
B) partial negative (δ-)charge. 
C) 3+ charge. 
D) 3- charge.

Question 20

Covalent bonding is a

Accepted Answer

A) gain of electrons. 
B) loss of electrons. 
C) transfer of electrons. 
D) sharing of electrons. 
A) gain of electrons. 
B) loss of electrons. 
C) transfer of electrons. 
D) sharing of electrons.

Exam 7: Covalent Bonding and Electron-Dot Structures

How many lone pairs of electrons are on the Xe atom in XeF6?

The greater the electronegativity difference between two bonded atoms,the

The electronegativity is 2.1 for H and 3.0 for N.Based on these electronegativities,NH4+ would be expected to

How many resonance structures are required in the electron-dot structure of CO32-?

Classify bonds in As4 as largely ionic,nonpolar covalent,or polar covalent.

Identify the fourth-row element X that forms the ion.

Which electrostatic forces hold atoms together in a molecule?

Using only the elements Be,Cl,and/or P,give the formula of a compound having largely ionic bonds.

Classify bonds in BeS as largely ionic,nonpolar covalent,or polar covalent.

Which is expected to have the strongest C-O bond?

Which molecule contains a triple bond?

How many double and single bonds are in the resonance form for SO2 in which the formal charges on each atom are zero?

Of the following elements,which has the lowest electronegativity?

The Lewis electron-dot structure of N2 has ________ nonbonding electrons pairs,________ bonding electron pairs,and a bond order of ________.

Assign formal charges to each atom in the resonance form for SOCl2 given below.

Which electron dot structure for OCN- has a formal charge of -1 on the most electronegative atom?

What is the bond order of the O-O bond in O2?

The phosphorus atom in PCl5 would be expected to have a

Covalent bonding is a

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How many lone pairs of electrons are on the Xe atom in XeF₆?

The electronegativity is 2.1 for H and 3.0 for N.Based on these electronegativities,NH₄⁺ would be expected to

How many resonance structures are required in the electron-dot structure of CO₃^2-?

Classify bonds in As₄ as largely ionic,nonpolar covalent,or polar covalent.

How many double and single bonds are in the resonance form for SO₂ in which the formal charges on each atom are zero?

The Lewis electron-dot structure of N₂ has nonbonding electrons pairs, bonding electron pairs,and a bond order of .

Assign formal charges to each atom in the resonance form for SOCl₂ given below.

Which electron dot structure for OCN^- has a formal charge of -1 on the most electronegative atom?

What is the bond order of the O-O bond in O₂?

The phosphorus atom in PCl₅ would be expected to have a