Question 1

Which of the following best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonding involves the transfer of electrons from a metal to a nonmetal, resulting in electrostatic attraction between ions, while covalent bonding involves the sharing of electrons between two nonmetals.

Question 2

According to the octet rule, how many valence electrons do atoms tend to have when forming compounds?

Accepted Answer

Atoms tend to have eight valence electrons.

Question 3

Which property is NOT characteristic of ionic substances?

Accepted Answer

Conductivity in solid state

Question 4

Which equation correctly represents the dipole moment ($$\mu) of a $$molecule?

Accepted Answer

$$\mu = Q 	imes r$$

Question 5

Which factor increases the lattice energy of an ionic compound?

Accepted Answer

Increasing the charge on the cations

Question 6

A compound has a difference in electronegativity of 2.5 between its elements. What type of bond is most likely present?

Accepted Answer

Ionic

Question 7

Which of the following best explains why NaCl is brittle?

Accepted Answer

The three-dimensional structure causes ions of like charge to repel when the crystal is shifted.

Question 8

Which element is most likely to form a covalent bond with chlorine?

Accepted Answer

Oxygen

Question 9

Which statement about electronegativity is correct?

Accepted Answer

Electronegativity increases across a period.

Question 10

Which of the following molecules has the most polar bond?

Accepted Answer

HF

Question 11

In the Born–Haber cycle for NaCl, which step involves the largest energy release?

Accepted Answer

Formation of the lattice energy

Question 12

Which Lewis structure correctly represents a molecule with a single bond and lone pairs?

Accepted Answer

:Cl–Cl:

Question 13

Which of the following is a real-world example of a compound with metallic bonding?

Accepted Answer

Copper wire

Question 14

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, resulting in partial charges.

Question 15

Which compound would you expect to have the highest lattice energy?

Accepted Answer

LiF

Question 16

Which of the following is NOT a factor that affects the polarity of a molecule?

Accepted Answer

Number of valence electrons

Question 17

A student mixes sodium metal and chlorine gas in a laboratory. Which type of reaction occurs and what is the product?

Accepted Answer

An ionic reaction producing NaCl

Question 18

Which of the following statements about lone pairs in Lewis structures is correct?

Accepted Answer

Lone pairs are unshared pairs of electrons located on only one atom.

Question 19

Which of the following best explains why HF has a higher dipole moment than HI?

Accepted Answer

HF has a shorter bond length and a greater difference in electronegativity.

Question 20

Which physical property would most likely indicate a compound is covalent rather than ionic?

Accepted Answer

Low melting point

Basic Concepts of Chemical Bonding: Ionic, Covalent, and Metallic Bonds

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