$\mathrm{[O-C(=O)-O]^{2-}}$ \,\text{with resonance between all three oxygens}$

Question 1

Which of the following Lewis structures correctly represents the carbonate ion ($\mathrm{CO_3^{2-}}$)?

Accepted Answer

$\mathrm{[O-C(=O)-O]^{2-}}$ \,	ext{with resonance between all three oxygens}$

Question 2

Which of the following molecules does NOT contain a carbon-oxygen double bond?

Accepted Answer

$\mathrm{CH_3OH}$

Question 3

How many sigma ($\sigma$) bonds and how many pi ($\pi$) bonds are present in the molecule below?

$\mathrm{CH_2=CH-CH_3}$

Accepted Answer

8 $\sigma$ bonds, 1 $\pi$ bond

Question 4

Which compound has the strongest carbon-carbon triple bond?

Accepted Answer

$\mathrm{C_2H_2}$

Question 5

Assign a formal charge to the nitrogen atom in the thiocyanate ion ($\mathrm{SCN^-}$) given the following Lewis structure:

$\mathrm{S=C=N^-}$

Accepted Answer

-1

Question 6

Which of the following best describes the molecular geometry of $\mathrm{BF_3}$?

Accepted Answer

Trigonal planar

Question 7

A central atom in a three-atom molecule forms two single bonds and possesses two lone pairs of electrons. What is its molecular geometry?

Accepted Answer

Bent

Question 8

Which of the following molecules adopts a tetrahedral geometry?

Accepted Answer

$\mathrm{CH_4}$

Question 9

Which of the following molecules adopts a bent geometry?

Accepted Answer

$\mathrm{H_2O}$

Question 10

Which part of a water molecule produces an ionic bond?

Accepted Answer

None; water forms covalent bonds

Question 11

Which part of a water molecule produces a polar covalent bond?

Accepted Answer

Between hydrogen and oxygen atoms

Question 12

Which of the following Lewis structures is correct for $\mathrm{CO_2}$?

Accepted Answer

$\mathrm{O=C=O}$

Question 13

Which of the following Lewis structures is correct for $\mathrm{C_2H_2}$?

Accepted Answer

$\mathrm{H-C\equiv C-H}$

Question 14

Which of the following molecular geometries can be described as containing a central atom that possesses two lone pairs of electrons?

Accepted Answer

Bent

Question 15

A molecule consists of two atoms (A-B), where $A = 1$, $B = 4$, $A < B$. Which of the following best describes its geometry?

Accepted Answer

Linear

Question 16

During the hybridization of the central atom in $\mathrm{CH_4}$, which orbitals are involved?

Accepted Answer

$sp^3$

Question 17

Which of the following best describes the bond angles in $\mathrm{NH_3}$?

Accepted Answer

Approximately $107^{\circ}$

Question 18

Which of the following molecules contains a central atom with no lone pairs and three surrounding atoms?

Accepted Answer

$\mathrm{BF_3}$

Question 19

Which of the following molecules contains a central atom with one lone pair and three surrounding atoms?

Accepted Answer

$\mathrm{NH_3}$

Question 20

Which of the following molecules contains a central atom with two lone pairs and two surrounding atoms?

Accepted Answer

$\mathrm{H_2O}$

General Chemistry Study Notes: Chemical Bonding, Lewis Structures, and Molecular Geometry

Study Guide - Practice Questions