Question 1

Which of the following best explains why atoms form chemical bonds according to the Lewis model?

Accepted Answer

Atoms form bonds to lower their potential energy by achieving a stable electron configuration.

Question 2

Which of the following compounds is most likely to contain ionic bonds?

Accepted Answer

MgF$$_2$$

Question 3

What is the Lewis symbol for silicon (Si)?

Accepted Answer

A symbol with four dots, one on each side

Question 4

Which of the following statements about lattice energy is correct?

Accepted Answer

Lattice energy increases as the magnitude of the ionic charges increases.

Question 5

Using the ionic bonding model, which compound has the higher melting point: NaCl or MgO? Explain.

Accepted Answer

MgO has a higher melting point because the ions have larger charges.

Question 6

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

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 7

Which of the following statements about the conductivity of ionic compounds is true?

Accepted Answer

Ionic compounds conduct electricity when dissolved in water.

Question 8

Arrange the following elements in order of decreasing electronegativity: P, Na, N, Al.

Accepted Answer

N \u003e P \u003e Al \u003e Na

Question 9

Which of the following bonds is most likely to be polar covalent?

Accepted Answer

A bond between two nonmetals with different electronegativities

Question 10

Which molecule would you expect to be a free radical?

Accepted Answer

ClO

Question 11

Which molecule could have an expanded octet?

Accepted Answer

H$$_3PO$_4$$

Question 12

Which of the following statements about bond energies is correct?

Accepted Answer

Bond breaking is endothermic and bond making is exothermic.

Question 13

The reaction between hydrogen and oxygen to form water is highly exothermic. Which statement is true of the energies of the bonds that break and form during the reaction?

Accepted Answer

The energy needed to break the required bonds is less than the energy released when the new bonds form.

Question 14

Which of the following best describes a metallic bond?

Accepted Answer

A bond formed by a sea of delocalized electrons shared among metal cations.

Question 15

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures differ only in the position of electrons.

Question 16

Which of the following is the correct formula for calculating the formal charge (FC) of an atom in a Lewis structure?

Accepted Answer

$$FC = 	ext{number of valence electrons} - [	ext{number of nonbonding electrons} + \frac{1}{2} 	imes 	ext{number of bonding electrons}]$$

Question 17

Which of the following statements about the octet rule is most accurate?

Accepted Answer

Atoms form bonds for complex reasons that include the lowering of potential energy. The octet rule helps us predict in which cases bonds form.

Question 18

Which of the following best describes the trend in bond length for covalent bonds?

Accepted Answer

Bond length decreases as the number of shared electrons increases.

Question 19

Which of the following best describes the percent ionic character of a bond?

Accepted Answer

It is the percentage of a bond’s measured dipole moment compared to what it would be if the electrons were completely transferred.

Chemical Bonding I: The Lewis Model – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards