Question 1

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 2

What is the bond angle in the following molecular model of I3-?

Accepted Answer

A) less than 120° 
B) 120° 
C) less than 180° but greater than 120° 
D) 180° 
A) less than 120° 
B) 120° 
C) less than 180° but greater than 120° 
D) 180°

Question 3

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

Accepted Answer

Question 4

What is the geometry around the central atom in the following molecular model of PH3?

Accepted Answer

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

Question 5

Based on formal charges,the P-O bond order in POCl3 is expected to be ________.

Accepted Answer

Question 6

The orbital hybridization on the carbon atom in C2H2  is

Accepted Answer

A) sp. 
B) sp2. 
C) sp3. 
D) sp3d2. 
A) sp. 
B) sp2. 
C) sp3. 
D) sp3d2.

Question 7

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.

Question 8

Of the following elements,which has the highest electronegativity?

Accepted Answer

A) S 
B) Cl 
C) Ti 
D) Se 
A) S 
B) Cl 
C) Ti 
D) Se

Question 9

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

Accepted Answer

A) Al4C3 
B) CF4 
C) CaF2 
D) WC 
A) Al4C3 
B) CF4 
C) CaF2 
D) WC

Question 10

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

Accepted Answer

A) CsI 
B) SnO2 
C) ClF5 
D) ClF 
A) CsI 
B) SnO2 
C) ClF5 
D) ClF

Question 11

How many lone pairs of electrons are on the As atom in As Cl3?

Accepted Answer

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

Question 12

The hybrid orbital used by carbon to overlap with hydrogen in C2H2 is ________.

Accepted Answer

Question 13

What is the bond angle in the following molecular model of SO2?

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 14

When melting S8,________ forces must be overcome and S8 is expected to have a ________ melting point than MgS.

Accepted Answer

A) covalent bonding,higher 
B) covalent bonding,lower 
C) intermolecular,higher 
D) intermolecular,lower 
A) covalent bonding,higher 
B) covalent bonding,lower 
C) intermolecular,higher 
D) intermolecular,lower

Question 15

What is the molecular geometry of Cl F4-?

Accepted Answer

A) seesaw 
B) square planar 
C) square pyramidal 
D) tetrahedral 
A) seesaw 
B) square planar 
C) square pyramidal 
D) tetrahedral

Question 16

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

Accepted Answer

Question 17

How many lone pairs are on the Br atom in BrCl2-?

Accepted Answer

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

Question 18

What are the bond angles in the following molecular model of NO3-?

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 19

What is the geometry around the central atom in the following molecular model of SCl4?

Accepted Answer

A) trigonal bipyramidal 
B) seesaw 
C) T-shaped 
D) linear 
A) trigonal bipyramidal 
B) seesaw 
C) T-shaped 
D) linear

Question 20

What is the geometry around the central atom in the following molecular model of NH2-?

Accepted Answer

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

Exam 7: Covalent Bonds and Molecular Structure

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

What is the bond angle in the following molecular model of I3-?

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

What is the geometry around the central atom in the following molecular model of PH3?

Based on formal charges,the P-O bond order in POCl3 is expected to be ________.

The orbital hybridization on the carbon atom in C2H2 is

The greater the electronegativity difference between two bonded atoms,the

Of the following elements,which has the highest electronegativity?

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

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

How many lone pairs of electrons are on the As atom in As Cl3?

The hybrid orbital used by carbon to overlap with hydrogen in C2H2 is ________.

What is the bond angle in the following molecular model of SO2?

When melting S8,________ forces must be overcome and S8 is expected to have a ________ melting point than MgS.

What is the molecular geometry of Cl F4-?

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

How many lone pairs are on the Br atom in BrCl2-?

What are the bond angles in the following molecular model of NO3-?

What is the geometry around the central atom in the following molecular model of SCl4?

What is the geometry around the central atom in the following molecular model of NH2-?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

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

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

What is the bond angle in the following molecular model of I₃^-?

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

What is the geometry around the central atom in the following molecular model of PH₃?

Based on formal charges,the P-O bond order in POCl₃ is expected to be ________.

The orbital hybridization on the carbon atom in C₂H₂ is

How many lone pairs of electrons are on the As atom in As Cl₃?

The hybrid orbital used by carbon to overlap with hydrogen in C₂H₂ is ________.

What is the bond angle in the following molecular model of SO₂?

When melting S₈, forces must be overcome and S₈ is expected to have a melting point than MgS.

What is the molecular geometry of Cl F₄^-?

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

How many lone pairs are on the Br atom in BrCl₂^-?

What are the bond angles in the following molecular model of NO₃^-?

What is the geometry around the central atom in the following molecular model of SCl₄?

What is the geometry around the central atom in the following molecular model of NH₂^-?