Question 1

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

Accepted Answer

To achieve a more stable electron configuration by lowering their potential energy

Question 2

Which of the following compounds is expected to have the highest lattice energy based on ion size and charge?

Accepted Answer

LiCl

Question 3

A pharmaceutical company is designing a drug to inhibit HIV-protease by binding to its active site. Which bonding theory would be most useful for predicting the shape and interaction of the drug molecule with the enzyme?

Accepted Answer

Lewis theory

Question 4

Which of the following statements about ionic compounds is FALSE?

Accepted Answer

Ionic compounds conduct electricity in the solid state.

Question 5

Which of the following best describes the bonding in metallic solids?

Accepted Answer

Electrons are pooled and delocalized among all metal atoms.

Question 6

Which of the following molecules contains a polar covalent bond?

Accepted Answer

$$\mathrm{HF}$$

Question 7

Given the following reaction, estimate $$\Delta H_{rxn}$$ using average bond energies:

$$\mathrm{CH}_4 + 2\mathrm{O}_2 \rightarrow \mathrm{CO}_2 + 2\mathrm{H}_2O

($$Bond energies: C–H = 413 kJ/mol, O=O = 495 kJ/mol, C=O = 799 kJ/mol, O–H = 463 kJ/mol)

Accepted Answer

$$-802 kJ$$

Question 8

Which of the following is the correct Lewis structure for the hydronium ion ($$\mathrm{H}_3\mathrm{O}^+$$)?

Accepted Answer

Oxygen with three single bonds to H and one lone pair, with a positive charge

Question 9

Which of the following best explains why $$\mathrm{NaCl}$$ conducts electricity when dissolved in water but not as a solid?

Accepted Answer

The ions are free to move in solution but locked in place in the solid.

Question 10

Which of the following statements about resonance structures is TRUE?

Accepted Answer

The actual molecule is a hybrid of all resonance forms.

Question 11

Which of the following elements is most likely to form an expanded octet in a stable compound?

Accepted Answer

Sulfur

Question 12

What is the formal charge on the central atom in the best Lewis structure for $$\mathrm{NO}_3^-$$?

Accepted Answer

$$0$$

Question 13

Which of the following trends is correct regarding bond length and bond strength for single, double, and triple bonds between like atoms?

Accepted Answer

Triple bonds are shorter and stronger than single bonds.

Question 14

Which of the following best describes the relationship between lattice energy and the charges of the ions in an ionic compound?

Accepted Answer

Lattice energy increases as the charges of the ions increase.

Question 15

Which of the following molecules is expected to have the greatest dipole moment?

Accepted Answer

$$\mathrm{LiF}$$

Question 16

Which of the following is a correct application of the octet rule?

Accepted Answer

Oxygen forms two bonds to achieve an octet.

Question 17

Which of the following best explains why ionic compounds are brittle?

Accepted Answer

Displacement of ions brings like charges together, causing repulsion and fracture.

Question 18

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

Accepted Answer

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

Question 19

Which of the following best describes the trend in electronegativity across a period and down a group in the periodic table?

Accepted Answer

Electronegativity increases across a period and decreases down a group.

Chemical Bonding I: The Lewis Model – Study Notes

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