Question 1

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

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between two nonmetals.

Question 2

Given the electronegativity values Cs: 0.7 and F: 4.0, which of the following bonds is most likely to be ionic?

Accepted Answer

$\mathrm{Cs-F}$

Question 3

Which molecule is nonpolar despite having polar bonds?

Accepted Answer

$\mathrm{CO_2}$

Question 4

What is the total number of valence electrons in the Lewis structure of $\mathrm{SF_6}$?

Accepted Answer

$48$

Question 5

Which of the following molecules violates the octet rule by having less than 8 electrons around its central atom?

Accepted Answer

$\mathrm{BF_3}$

Question 6

What is the bond order of ozone ($\mathrm{O_3}$) given its resonance structures?

Accepted Answer

$1.5$

Question 7

Which of the following is the correct formal charge on the central carbon atom in $\mathrm{CO_2}$ using the Lewis structure $O=C=O$?

Accepted Answer

$0$

Question 8

A molecule has an electronegativity difference of $1.8$ between its two atoms. What type of bond is most likely present?

Accepted Answer

Polar covalent bond

Question 9

Which of the following is a correct step in drawing a Lewis structure for a molecule?

Accepted Answer

Determine the total number of valence electrons for all atoms in the molecule.

Question 10

Which molecule below can have an expanded octet in its Lewis structure?

Accepted Answer

$\mathrm{SF_6}$

Question 11

Which of the following is true about resonance structures?

Accepted Answer

Resonance structures are used when one Lewis structure cannot adequately describe the bonding.

Question 12

In the Lewis structure for $\mathrm{NH_3}$, how many lone pairs are present on the nitrogen atom?

Accepted Answer

$1$

Question 13

Which of the following molecules is expected to be polar?

Accepted Answer

$\mathrm{H_2O}$

Question 14

What is the formal charge on the oxygen atom in the following resonance structure of acetic acid: $\mathrm{H_3C-COO^-}$?

Accepted Answer

$-1$

Question 15

Which of the following is a correct statement about electronegativity trends in the periodic table?

Accepted Answer

Electronegativity decreases from top to bottom and increases from left to right.

Question 16

Which of the following is the correct line-angle formula for acetic acid?

Accepted Answer

A zig-zag line with two vertices, one ending with an OH group and the other with a double-bonded O.

Question 17

Which molecule below is electron-deficient and likely to form a dimer such as diborane?

Accepted Answer

$\mathrm{BH_3}$

Question 18

Which of the following is the best resonance structure for the thiocyanate ion ($\mathrm{SCN^-}$)?

Accepted Answer

The structure with a negative charge on nitrogen and no formal charge on sulfur or carbon.

Question 19

Which of the following statements about formal charges is correct?

Accepted Answer

Formal charges are calculated by subtracting the number of assigned electrons in the molecule from the number of valence electrons in the isolated atom.

Question 20

Which of the following molecules has a central atom that can have more than 8 electrons due to the presence of d orbitals?

Accepted Answer

$\mathrm{SF_6}$

Chemical Bonding: Concepts, Types, and Lewis Structures

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