Question 1

Which of the following best explains why sodium (Na) forms a cation while chlorine (Cl) forms an anion in the formation of NaCl?
Correct answer: Sodium loses electrons to achieve a stable octet, while chlorine gains electrons to achieve a stable octet.

Accepted Answer

Sodium loses electrons to achieve a stable octet, while chlorine gains electrons to achieve a stable octet.

Question 2

Which of the following statements about metallic bonding is correct?
Correct answer: Metallic bonds feature free-flowing valence electrons among a lattice of metal ions, leading to properties like conductivity.

Accepted Answer

Metallic bonds feature free-flowing valence electrons among a lattice of metal ions, leading to properties like conductivity.

Question 3

A molecule of carbon dioxide (CO₂) is nonpolar, even though it contains polar bonds. Which concept best explains this observation?
Correct answer: The molecule has a linear geometry, causing the dipole moments to cancel each other out.

Accepted Answer

The molecule has a linear geometry, causing the dipole moments to cancel each other out.

Question 4

Which of the following elements is most likely to violate the octet rule by having an expanded octet in its compounds?
Correct answer: Phosphorus (P)

Accepted Answer

Phosphorus (P)

Question 5

Given the following Lewis structure for the nitrate ion (NO₃⁻), which atom is most likely to carry a formal charge, and what is its value?
Correct answer: One oxygen, -1

Accepted Answer

One oxygen, -1

Question 6

Which of the following best describes a pi (π) bond?
Correct answer: A pi bond is formed by the sideways overlap of p orbitals and is present in double and triple bonds.

Accepted Answer

A pi bond is formed by the sideways overlap of p orbitals and is present in double and triple bonds.

Question 7

Which of the following compounds contains both sigma and pi bonds?
Correct answer: Ethene (C₂H₄)

Accepted Answer

Ethene (C₂H₄)

Question 8

A student draws the Lewis structure for the sulfate ion (SO₄²⁻) and assigns all single bonds between sulfur and oxygen. What is the formal charge on the sulfur atom in this structure?
Correct answer: +2

Accepted Answer

+2

Question 9

Which of the following best describes the process for drawing the Lewis structure of a polyatomic ion like NH₄⁺?
Correct answer: Count the total valence electrons, subtract one for the positive charge, arrange atoms, and complete octets.

Accepted Answer

Count the total valence electrons, subtract one for the positive charge, arrange atoms, and complete octets.

Question 10

Which of the following best explains why ionic compounds like NaCl have high melting points?
Correct answer: They contain strong electrostatic attractions between oppositely charged ions.

Accepted Answer

They contain strong electrostatic attractions between oppositely charged ions.

Question 11

Which of the following pairs of atoms would form the most polar covalent bond?
Correct answer: O and H

Accepted Answer

O and H

Question 12

A molecule has a central atom with two lone pairs and two single bonds. According to the Lewis structure rules, what is the likely geometry of this molecule?
Correct answer: Bent (angular)

Accepted Answer

Bent (angular)

Question 13

Which of the following statements about radicals is correct?
Correct answer: Radicals have an unpaired electron, which is placed on the atom with the lowest formal charge.

Accepted Answer

Radicals have an unpaired electron, which is placed on the atom with the lowest formal charge.

Question 14

Which of the following best describes the relationship between bond order, bond length, and bond strength?
Correct answer: As bond order increases, bond length decreases and bond strength increases.

Accepted Answer

As bond order increases, bond length decreases and bond strength increases.

Question 15

Which of the following is the correct Lewis dot symbol for the chloride ion (Cl⁻)?
Correct answer: Cl with 8 dots and a negative sign

Accepted Answer

Cl with 8 dots and a negative sign

Question 16

A student is asked to draw the Lewis structure for carbon monoxide (CO). Which of the following is true about the bonding in CO?
Correct answer: CO contains a triple bond and both atoms have a complete octet.

Accepted Answer

CO contains a triple bond and both atoms have a complete octet.

Question 17

Which of the following best explains why fluorine is the most electronegative element?
Correct answer: Fluorine has a high nuclear charge and a small atomic radius, maximizing its ability to attract electrons.

Accepted Answer

Fluorine has a high nuclear charge and a small atomic radius, maximizing its ability to attract electrons.

Question 18

Which of the following best describes the difference between ionic and covalent bonding?
Correct answer: Ionic bonding involves the transfer of electrons from metals to nonmetals, while covalent bonding involves the sharing of electrons between nonmetals.

Accepted Answer

Ionic bonding involves the transfer of electrons from metals to nonmetals, while covalent bonding involves the sharing of electrons between nonmetals.

Question 19

Which of the following is the correct formal charge calculation for the oxygen atom in water (H₂O)?
Correct answer: 6 - (4 nonbonding + 2 bonds) = 0

Accepted Answer

6 - (4 nonbonding + 2 bonds) = 0

Key Concepts in Chemical Bonding and Lewis Dot Structures

Study Guide - Practice Questions

Study Guide - Flashcards