Question 1

Which of the following best explains why sodium chloride (NaCl) is a solid with a high melting point at room temperature?
Correct answer: It is composed of oppositely charged ions held together by strong electrostatic forces.

Accepted Answer

It is composed of oppositely charged ions held together by strong electrostatic forces.

Question 2

Which element would you expect to have the highest electronegativity?
Correct answer: Fluorine (F)

Accepted Answer

Fluorine (F)

Question 3

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

Accepted Answer

The molecule has a linear geometry causing the bond dipoles to cancel each other out.

Question 4

Which of the following Lewis dot symbols correctly represents a chloride ion (Cl⁻)?
Correct answer: Cl with eight dots and a negative sign

Accepted Answer

Cl with eight dots and a negative sign

Question 5

Which of the following bonds is expected to be the most polar?
Correct answer: O–H

Accepted Answer

O–H

Question 6

A student draws the following Lewis structure for the nitrate ion (NO₃⁻): the central nitrogen atom is single-bonded to three oxygen atoms, and each oxygen has a full octet. What is the formal charge on the nitrogen atom in this structure?
Correct answer: +1

Accepted Answer

+1

Question 7

Which of the following best describes metallic bonding in copper (Cu)?
Correct answer: Copper atoms are surrounded by a sea of delocalized electrons that move freely.

Accepted Answer

Copper atoms are surrounded by a sea of delocalized electrons that move freely.

Question 8

Which of the following molecules violates the octet rule by having an expanded octet?
Correct answer: SF₆

Accepted Answer

SF₆

Question 9

A bond between which pair of atoms is most likely to be classified as ionic?
Correct answer: Na and Cl

Accepted Answer

Na and Cl

Question 10

Which of the following statements about formal charge is correct?
Correct answer: Formal charge is calculated as the number of valence electrons minus the sum of nonbonding electrons and bonds.

Accepted Answer

Formal charge is calculated as the number of valence electrons minus the sum of nonbonding electrons and bonds.

Question 11

Which of the following best explains why metals are good conductors of electricity?
Correct answer: They have loosely held valence electrons that can move freely throughout the structure.

Accepted Answer

They have loosely held valence electrons that can move freely throughout the structure.

Question 12

Which of the following pairs of atoms would form a nonpolar covalent bond?
Correct answer: O and O

Accepted Answer

O and O

Question 13

A molecule has a net dipole moment. Which of the following must be true?
Correct answer: It contains at least one polar bond and the molecular geometry does not cancel the dipoles.

Accepted Answer

It contains at least one polar bond and the molecular geometry does not cancel the dipoles.

Question 14

Which of the following best describes the process of drawing a Lewis dot symbol for a neutral oxygen atom?
Correct answer: Place six dots around the O symbol, one on each side before pairing.

Accepted Answer

Place six dots around the O symbol, one on each side before pairing.

Question 15

Which of the following real-world scenarios is best explained by the concept of dipole moments?
Correct answer: Water's ability to dissolve ionic compounds like NaCl.

Accepted Answer

Water's ability to dissolve ionic compounds like NaCl.

Question 16

Which of the following statements about the octet rule is correct?
Correct answer: Some elements, such as phosphorus and sulfur, can have more than eight valence electrons.

Accepted Answer

Some elements, such as phosphorus and sulfur, can have more than eight valence electrons.

Question 17

A student is asked to classify the bond in hydrogen fluoride (HF). Which of the following is the correct classification and reasoning?
Correct answer: Polar covalent, because the electronegativity difference is significant but less than 1.7.

Accepted Answer

Polar covalent, because the electronegativity difference is significant but less than 1.7.

Question 18

Which of the following best describes the electron configuration of a magnesium ion (Mg²⁺) as represented by its Lewis dot symbol?
Correct answer: Mg with no dots and a 2+ charge

Accepted Answer

Mg with no dots and a 2+ charge

Question 19

Which of the following is the best explanation for why chlorine forms a Cl⁻ ion rather than a Cl²⁻ ion?
Correct answer: Chlorine only needs one more electron to achieve a noble gas configuration.

Accepted Answer

Chlorine only needs one more electron to achieve a noble gas configuration.

Question 20

Which of the following best describes the relationship between bond type and electronegativity difference?
Correct answer: A bond with an electronegativity difference of 1.8 is likely ionic.

Accepted Answer

A bond with an electronegativity difference of 1.8 is likely ionic.

Key Concepts in Chemical Bonding and Lewis Structures

Study Guide - Practice Questions

Study Guide - Flashcards