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 a lattice of oppositely charged ions held together by strong electrostatic forces.

Accepted Answer

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

Question 2

Which of the following elements is most likely to form an expanded octet in a stable compound?
Correct answer: Phosphorus (P)

Accepted Answer

Phosphorus (P)

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 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 statements about sigma (σ) and pi (π) bonds is correct?
Correct answer: A triple bond consists of one sigma and two pi bonds.

Accepted Answer

A triple bond consists of one sigma and two pi bonds.

Question 5

Given the following electronegativities: H = 2.1, Cl = 3.0, O = 3.5, which bond is the most polar?
Correct answer: H–O

Accepted Answer

H–O

Question 6

Which of the following best describes the role of formal charge in determining the best Lewis structure for a molecule?
Correct answer: The best Lewis structure minimizes formal charges and places negative charges on the most electronegative atoms.

Accepted Answer

The best Lewis structure minimizes formal charges and places negative charges on the most electronegative atoms.

Question 7

Which of the following species is a radical?
Correct answer: NO₂

Accepted Answer

NO₂

Question 8

A student draws the Lewis structure for the sulfate ion (SO₄²⁻) and assigns a formal charge of +2 to the sulfur atom. What is the most likely error in the student's structure?
Correct answer: The student did not include enough double bonds between sulfur and oxygen.

Accepted Answer

The student did not include enough double bonds between sulfur and oxygen.

Question 9

Which of the following best explains why metals are good conductors of electricity?
Correct answer: Metals have delocalized valence electrons that can move freely throughout the lattice.

Accepted Answer

Metals have delocalized valence electrons that can move freely throughout the lattice.

Question 10

Which of the following molecules violates the octet rule by having an incomplete octet?
Correct answer: BF₃

Accepted Answer

BF₃

Question 11

A chemist is analyzing a compound and finds that it contains a metal and a nonmetal. Which type of bonding is most likely present in this compound?
Correct answer: Ionic bonding

Accepted Answer

Ionic bonding

Question 12

Which of the following statements about bond strength and bond length is correct?
Correct answer: Triple bonds are stronger and shorter than single bonds.

Accepted Answer

Triple bonds are stronger and shorter than single bonds.

Question 13

Which of the following best describes a nonpolar covalent bond?
Correct answer: A bond in which electrons are shared equally between two atoms.

Accepted Answer

A bond in which electrons are shared equally between two atoms.

Question 14

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

Accepted Answer

Cl with eight dots and a negative charge

Question 15

Which of the following best explains why the O₂ molecule is paramagnetic?
Correct answer: O₂ contains unpaired electrons in its molecular orbitals.

Accepted Answer

O₂ contains unpaired electrons in its molecular orbitals.

Question 16

Which of the following pairs of atoms would form the most ionic bond?
Correct answer: Na and Cl

Accepted Answer

Na and Cl

Question 17

A molecule has a central atom with three bonding pairs and one lone pair. Which of the following best describes the electron geometry and molecular shape?
Correct answer: Tetrahedral electron geometry, trigonal pyramidal molecular shape

Accepted Answer

Tetrahedral electron geometry, trigonal pyramidal molecular shape

Question 18

Which of the following statements about lone pairs is correct?
Correct answer: Lone pairs are nonbonding pairs of electrons on an atom.

Accepted Answer

Lone pairs are nonbonding pairs of electrons on an atom.

Question 19

Which of the following best describes the process of drawing Lewis structures for polyatomic ions?
Correct answer: Draw the structure as for a neutral molecule, then add or remove electrons to account for the charge.

Accepted Answer

Draw the structure as for a neutral molecule, then add or remove electrons to account for the charge.

Question 20

Which of the following is the correct formal charge on nitrogen in the ammonium ion (NH₄⁺)?
Correct answer: 0

Accepted Answer

0

Key Concepts in Chemical Bonding and Lewis Structures

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