Question 1

What is the geometry around the central atom in the following molecular model of H3O+?

Accepted Answer

A) linear 
B) bent 
C) trigonal pyramidal 
D) tetrahedral 
A) linear 
B) bent 
C) trigonal pyramidal 
D) tetrahedral

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

What are the bond angles in the following molecular model of NH4+?

Accepted Answer

A) less than 109.5° 
B) 109.5° 
C) less than 120° but greater than 109.5° 
D) 120° 
A) less than 109.5° 
B) 109.5° 
C) less than 120° but greater than 109.5° 
D) 120°

Question 5

What is geometry around the carbon atom labeled C3?

Accepted Answer

A) bent 
B) tetrahedral 
C) trigonal planar 
D) trigonal pyramidal 
A) bent 
B) tetrahedral 
C) trigonal planar 
D) trigonal pyramidal

Question 6

Based on VSEPR theory,which should have the smallest XAX bond angle?

Accepted Answer

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

Question 7

The Cl-Cl bond energy is 243 kJ/mol.Therefore the formation of a single bond between chlorine atoms

Accepted Answer

A) should require the absorption of 243 kJ per mole of Cl2 formed. 
B) should require the absorption of 486 kJ per mole of Cl2 formed. 
C) should result in the release of 243 kJ per mole of Cl2 formed. 
D) should result in the release of 486 kJ per mole of Cl2 formed. 
A) should require the absorption of 243 kJ per mole of Cl2 formed. 
B) should require the absorption of 486 kJ per mole of Cl2 formed. 
C) should result in the release of 243 kJ per mole of Cl2 formed. 
D) should result in the release of 486 kJ per mole of Cl2 formed.

Question 8

Which atomic orbitals are involved in bonding and which as lone pair orbitals for N2H2?

Accepted Answer

A) bonding: s on H,sp2 on N lone pair: p on N 
B) bonding: sp2 on both H and N lone pair: p on N 
C) bonding: s on H,p on N lone pair: sp2 on N 
D) bonding: s on H,sp2 and p on N lone pair: sp2 on N 
A) bonding: s on H,sp2 on N lone pair: p on N 
B) bonding: sp2 on both H and N lone pair: p on N 
C) bonding: s on H,p on N lone pair: sp2 on N 
D) bonding: s on H,sp2 and p on N lone pair: sp2 on N

Question 9

If an electron is added to H2 it would go into a

Accepted Answer

A) σ molecular orbital and strengthen the H-H bond. 
B) σ molecular orbital and weaken the H-H bond. 
C) σ* molecular orbital and strengthen the H-H bond. 
D) σ* molecular orbital and weaken the H-H bond. 
A) σ molecular orbital and strengthen the H-H bond. 
B) σ molecular orbital and weaken the H-H bond. 
C) σ* molecular orbital and strengthen the H-H bond. 
D) σ* molecular orbital and weaken the H-H bond.

Question 10

What are the F-Po-F bond angles in PoF6 ?

Accepted Answer

A) 60° 
B) 90° 
C) 109.5° 
D) 120° 
A) 60° 
B) 90° 
C) 109.5° 
D) 120°

Question 11

Which drawing represents the molecular orbital containing the highest energy electrons in the F2 molecule in its ground state?

Accepted Answer

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

Question 12

Which of the following best describes Cl F2-? It has a molecular geometry that is

Accepted Answer

A) linear with no lone pairs on the Cl atom. 
B) linear with lone pairs on the Cl atom. 
C) nonlinear with no lone pairs on the Cl atom. 
D) nonlinear with lone pairs on the Cl atom. 
A) linear with no lone pairs on the Cl atom. 
B) linear with lone pairs on the Cl atom. 
C) nonlinear with no lone pairs on the Cl atom. 
D) nonlinear with lone pairs on the Cl atom.

Question 13

What is the geometry around the central atom in the following molecular model of BrF5?

Accepted Answer

A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar 
A) trigonal bipyramidal 
B) octahedral 
C) square pyramidal 
D) square planar

Question 14

The VSEPR model predicts the HOH bond angle in H3O+ to be

Accepted Answer

A) 60°. 
B) 90°. 
C) less than 109.5° but greater than 90°. 
D) 109.5°. 
A) 60°. 
B) 90°. 
C) less than 109.5° but greater than 90°. 
D) 109.5°.

Question 15

Of the following elements,which has the lowest electronegativity?

Accepted Answer

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

Question 16

Of the following elements,which has the lowest electronegativity?

Accepted Answer

A) Mg 
B) Cl 
C) Ca 
D) Br 
A) Mg 
B) Cl 
C) Ca 
D) Br

Question 17

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 18

How many lone pairs of electrons are on the S atom in SF4 ?

Accepted Answer

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

Question 19

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 20

The phosphorus atom in PCl3 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.

Exam 7: Covalent Bonds and Molecular Structure

What is the geometry around the central atom in the following molecular model of H3O+?

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

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

What are the bond angles in the following molecular model of NH4+?

What is geometry around the carbon atom labeled C3?

Based on VSEPR theory,which should have the smallest XAX bond angle?

The Cl-Cl bond energy is 243 kJ/mol.Therefore the formation of a single bond between chlorine atoms

Which atomic orbitals are involved in bonding and which as lone pair orbitals for N2H2?

If an electron is added to H2 it would go into a

What are the F-Po-F bond angles in PoF6 ?

Which drawing represents the molecular orbital containing the highest energy electrons in the F2 molecule in its ground state?

Which of the following best describes Cl F2-? It has a molecular geometry that is

What is the geometry around the central atom in the following molecular model of BrF5?

The VSEPR model predicts the HOH bond angle in H3O+ to be

Of the following elements,which has the lowest electronegativity?

Of the following elements,which has the lowest electronegativity?

Which molecule has the weakest bonds?

How many lone pairs of electrons are on the S atom in SF4 ?

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

The phosphorus atom in PCl3 would be expected to have a

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Filters

What is the geometry around the central atom in the following molecular model of H₃O⁺?

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

What are the bond angles in the following molecular model of NH₄⁺?

What is geometry around the carbon atom labeled C₃?

Which atomic orbitals are involved in bonding and which as lone pair orbitals for N₂H₂?

If an electron is added to H₂ it would go into a

What are the F-Po-F bond angles in PoF₆ ?

Which drawing represents the molecular orbital containing the highest energy electrons in the F₂ molecule in its ground state?

Which of the following best describes Cl F₂^-? It has a molecular geometry that is

What is the geometry around the central atom in the following molecular model of BrF₅?

The VSEPR model predicts the HOH bond angle in H₃O⁺ to be

How many lone pairs of electrons are on the S atom in SF₄?

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

The phosphorus atom in PCl₃ would be expected to have a