Question 1

The compound CCl4 contains

Accepted Answer

A) ionic bonds. 
B) nonpolar covalent bonds. 
C) polar covalent bonds,with partial negative charges on the Cl atoms. 
D) polar covalent bonds,with partial negative charges on the C atoms. 
A) ionic bonds. 
B) nonpolar covalent bonds. 
C) polar covalent bonds,with partial negative charges on the Cl atoms. 
D) polar covalent bonds,with partial negative charges on the C atoms.

Question 2

Of the following elements,which has the lowest electronegativity?

Accepted Answer

A) Ba 
B) I 
C) Ra 
D) At 
A) Ba 
B) I 
C) Ra 
D) At

Question 3

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

Accepted Answer

The answer of Which compound is most likely to exist...

Question 4

Which molecule contains the most polar bonds?

Accepted Answer

A) CF4 
B) TeO2 
C) NO- 
D) CCl4 
A) CF4 
B) TeO2 
C) NO- 
D) CCl4

Question 5

Which is the most acceptable electron dot structure for N2H2?

Accepted Answer

A) H -  
-
  
- H 
B) H -  
=
  
- H 
C) H - N  
N - H 
D) H -

- H 
A) H -  
-
  
- H 
B) H -  
=
  
- H 
C) H - N  
N - H 
D) H -

- H

Question 6

How many lone pairs are on the central Br atom in Br3-?

Accepted Answer

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

Question 7

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 8

How many lone pairs are there in the Lewis structure of O2?

Accepted Answer

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

Question 9

Of the following elements,which has the highest electronegativity?

Accepted Answer

A) As 
B) Se 
C) Y 
D) Sb 
A) As 
B) Se 
C) Y 
D) Sb

Question 10

How many lone pairs are on the Br atom in BrI2-?

Accepted Answer

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

Question 11

What bond distance is expected to be longest?

Accepted Answer

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

Question 12

A reactive element with a relatively high electronegativity would be expected to have a relatively

Accepted Answer

A) small negative electron affinity and a relatively low ionization energy. 
B) small negative electron affinity and a relatively high ionization energy. 
C) large negative electron affinity and a relatively low ionization energy. 
D) large negative electron affinity and a relatively high ionization energy. 
A) small negative electron affinity and a relatively low ionization energy. 
B) small negative electron affinity and a relatively high ionization energy. 
C) large negative electron affinity and a relatively low ionization energy. 
D) large negative electron affinity and a relatively high ionization energy.

Question 13

How many electrons are in the valence shell of I in IF4-?

Accepted Answer

A) 8 
B) 10 
C) 12 
D) 14 
A) 8 
B) 10 
C) 12 
D) 14

Question 14

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

Accepted Answer

A) NaCl 
B) SiO2 
C) BrF3 
D) BrF 
A) NaCl 
B) SiO2 
C) BrF3 
D) BrF

Question 15

Which is the longest bond?

Accepted Answer

A) N-N 
B) N=N 
C) N  
N 
D) N-H 
A) N-N 
B) N=N 
C) N  
N 
D) N-H

Question 16

Based on formal charges,the best Lewis electron-dot structure of BF3 has a B-F bond order equal to ________.

Accepted Answer

Question 17

The Cl-Cl bond energy is 199 kJ/mol.Therefore the formation of a single bond between atoms

Accepted Answer

A) should require the absorption of 199 kJ per mole of Cl-Cl formed. 
B) should require the absorption of 398 kJ per mole of Cl-Cl formed. 
C) should result in the release of 199 kJ per mole of Cl-Cl formed. 
D) should result in the release of 398 kJ per mole of Cl-Cl formed. 
A) should require the absorption of 199 kJ per mole of Cl-Cl formed. 
B) should require the absorption of 398 kJ per mole of Cl-Cl formed. 
C) should result in the release of 199 kJ per mole of Cl-Cl formed. 
D) should result in the release of 398 kJ per mole of Cl-Cl formed.

Question 18

The chlorine atom in Cl2 would be expected to have a

Accepted Answer

A) charge of 1-. 
B) partial charge δ-. 
C) partial charge δ+. 
D) charge of 0. 
A) charge of 1-. 
B) partial charge δ-. 
C) partial charge δ+. 
D) charge of 0.

Question 19

Which molecule has the weakest bonds?

Accepted Answer

A) CF4 
B) CCl4 
C) CBr4 
D) CI4 
A) CF4 
B) CCl4 
C) CBr4 
D) CI4

Question 20

The electronegativity is 2.1 for H and 1.9 for Sb.Based on these electronegativities SbH3 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.

Exam 7: Covalent Bonding and Electron-Dot Structures

The compound CCl4 contains

Of the following elements,which has the lowest electronegativity?

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

Which molecule contains the most polar bonds?

Which is the most acceptable electron dot structure for N2H2?

How many lone pairs are on the central Br atom in Br3-?

The phosphorus atom in PCl5 would be expected to have a

How many lone pairs are there in the Lewis structure of O2?

Of the following elements,which has the highest electronegativity?

How many lone pairs are on the Br atom in BrI2-?

What bond distance is expected to be longest?

A reactive element with a relatively high electronegativity would be expected to have a relatively

How many electrons are in the valence shell of I in IF4-?

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

Which is the longest bond?

Based on formal charges,the best Lewis electron-dot structure of BF3 has a B-F bond order equal to ________.

The Cl-Cl bond energy is 199 kJ/mol.Therefore the formation of a single bond between atoms

The chlorine atom in Cl2 would be expected to have a

Which molecule has the weakest bonds?

The electronegativity is 2.1 for H and 1.9 for Sb.Based on these electronegativities SbH3 would be expected to

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The compound CCl₄ contains

Which is the most acceptable electron dot structure for N₂H₂?

How many lone pairs are on the central Br atom in Br₃^-?

The phosphorus atom in PCl₅ would be expected to have a

How many lone pairs are there in the Lewis structure of O₂?

How many lone pairs are on the Br atom in BrI₂^-?

How many electrons are in the valence shell of I in IF₄^-?

Based on formal charges,the best Lewis electron-dot structure of BF₃ has a B-F bond order equal to ________.

The chlorine atom in Cl₂ would be expected to have a

The electronegativity is 2.1 for H and 1.9 for Sb.Based on these electronegativities SbH₃ would be expected to