Question 1

Which of the following molecules is nonpolar, despite containing polar bonds, due to its molecular geometry?

Accepted Answer

CO$_2$

Question 2

What is the hybridization of the central atom in BF$_3$?

Accepted Answer

$sp^2$

Question 3

A molecule has four electron groups around its central atom, two of which are lone pairs. What is its molecular geometry and approximate bond angle?

Accepted Answer

Bent, $\approx 104.5^\circ$

Question 4

Which of the following statements about resonance structures is TRUE?

Accepted Answer

The true structure is an average (hybrid) of all resonance forms.

Question 5

How many sigma ($\sigma$) and pi ($\pi$) bonds are present in a molecule of C$_2$H$_2$ (acetylene)?

Accepted Answer

3 $\sigma$, 2 $\pi$

Question 6

A sample of gas has a pressure of 0.65 atm. What is this pressure in kPa? ($1\ 	ext{atm} = 101.325\ 	ext{kPa}$)

Accepted Answer

$65.9\ 	ext{kPa}$

Question 7

Which molecule below has a trigonal pyramidal molecular geometry?

Accepted Answer

NH$_3$

Question 8

Which of the following best explains why H$_2$O is polar while CO$_2$ is nonpolar?

Accepted Answer

H$_2$O has polar bonds and a bent geometry, so dipoles do not cancel.

Question 9

What is the electron geometry and hybridization of the central atom in SO$_2$?

Accepted Answer

Trigonal planar, $sp^2$

Question 10

Which of the following molecules exhibits resonance?

Accepted Answer

NO$_3^-$

Question 11

A molecule has five electron groups around the central atom and no lone pairs. What is its molecular geometry?

Accepted Answer

Trigonal bipyramidal

Question 12

Which of the following best describes the bonding in a double bond?

Accepted Answer

One $\sigma$ bond and one $\pi$ bond

Question 13

Which property is NOT characteristic of gases?

Accepted Answer

High density

Question 14

What is the molecular geometry of SF$_6$?

Accepted Answer

Octahedral

Question 15

Which of the following molecules is expected to be polar?

Accepted Answer

SO$_2$

Question 16

How many electron groups are around the central atom in PCl$_5$ and what is its hybridization?

Accepted Answer

5 electron groups, $sp^3d$ hybridization

Question 17

Which of the following is the correct pressure conversion for 500 mmHg to atm?

Accepted Answer

$0.658$ atm

Question 18

Which statement about hybrid orbitals is correct?

Accepted Answer

The number of hybrid orbitals equals the number of electron groups around the central atom.

Question 19

Which molecule has a bond angle closest to $120^\circ$?

Accepted Answer

BF$_3$

Question 20

Which of the following best describes the difference between electron geometry and molecular geometry?

Accepted Answer

Electron geometry considers all electron groups, while molecular geometry considers only the arrangement of atoms.

General Chemistry Study Guide: Molecular Geometry, Bonding Theories, and Gas Properties

Study Guide - Practice Questions