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 molecules is expected to have the largest dipole moment?
Correct answer: HF

Accepted Answer

HF

Question 3

A student draws the Lewis dot symbol for the oxide ion (O2−). Which of the following is correct?
Correct answer: O with eight dots and a 2− charge

Accepted Answer

O with eight dots and a 2− charge

Question 4

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 5

Which of the following statements about electronegativity is correct?
Correct answer: Electronegativity increases across a period and up a group.

Accepted Answer

Electronegativity increases across a period and up a group.

Question 6

Given the following bonds, which is most likely to be ionic?
Correct answer: Na–Cl

Accepted Answer

Na–Cl

Question 7

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

Accepted Answer

SF6

Question 8

A Lewis structure for the nitrate ion (NO3−) is drawn. What is the formal charge on the central nitrogen atom?
Correct answer: +1

Accepted Answer

+1

Question 9

Which of the following best describes the bond in a molecule of H2?
Correct answer: Nonpolar covalent bond

Accepted Answer

Nonpolar covalent bond

Question 10

A patient is given a saline solution containing Na+ and Cl− ions. Which type of bonding is present between the sodium and chloride ions in the solid salt before it dissolves?
Correct answer: Ionic bonding

Accepted Answer

Ionic bonding

Question 11

Which of the following best explains why metals are good conductors of electricity?
Correct answer: They have a sea of delocalized electrons that can move freely.

Accepted Answer

They have a sea of delocalized electrons that can move freely.

Question 12

Which of the following pairs of atoms would form a bond with the greatest polarity?
Correct answer: H and F

Accepted Answer

H and F

Question 13

A student is asked to draw the Lewis structure for the ammonium ion (NH4+). How many valence electrons should be included in the structure?
Correct answer: 8 (5 from N, 4 from H, minus 1 for the positive charge)

Accepted Answer

8 (5 from N, 4 from H, minus 1 for the positive charge)

Question 14

Which of the following best describes the difference between polar covalent and nonpolar covalent bonds?
Correct answer: Polar covalent bonds involve unequal sharing of electrons, while nonpolar covalent bonds involve equal sharing.

Accepted Answer

Polar covalent bonds involve unequal sharing of electrons, while nonpolar covalent bonds involve equal sharing.

Question 15

Which of the following is the correct formal charge for oxygen in the Lewis structure of water (H2O)?
Correct answer: 0

Accepted Answer

0

Question 16

Which of the following best explains why carbon dioxide (CO2) is a nonpolar molecule, even though it contains polar bonds?
Correct answer: The molecule is linear, so the bond dipoles cancel each other out.

Accepted Answer

The molecule is linear, so the bond dipoles cancel each other out.

Question 17

Which of the following elements is most likely to have an incomplete octet in its compounds?
Correct answer: Boron

Accepted Answer

Boron

Question 18

A chemist is analyzing a compound and finds that it is malleable, conducts electricity, and has a shiny appearance. Which type of bonding is most likely present?
Correct answer: Metallic bonding

Accepted Answer

Metallic bonding

Question 19

Which of the following best describes the process of drawing Lewis dot symbols for main group elements?
Correct answer: Place one electron on each side before pairing.

Accepted Answer

Place one electron on each side before pairing.

Question 20

Which of the following statements about the octet rule is correct?
Correct answer: Some elements, such as boron and sulfur, can have incomplete or expanded octets.

Accepted Answer

Some elements, such as boron and sulfur, can have incomplete or expanded octets.

Key Concepts in Chemical Bonding and Lewis Structures

Study Guide - Practice Questions

Study Guide - Flashcards