1. General, Organic, and Biological Chemistry
Fourth Edition
Karen Timberlake
Chapter 7
Gases
7.1
Properties of Gases
Lectures
© 2013 Pearson Education, Inc.

2. Common Gases Of the elements on the periodic table, some exist as a
gas at room temperature, these include
the Noble Gases, Group 8A (18),
H2, N2, O2, F2, Cl2, and
many oxides of nonmetals such as CO, CO2, NO, NO2, SO2, and SO3. 2

3. Gases and Environmental Concerns
Some gases are responsible for environmental and
health concerns including
methane, CH4,
chlorofluorocarbons (CFCs),
nitrogen oxides found in smog, and
volatile organic compounds (VOCs), such as compounds found in paint thinners. 3

4. Kinetic Theory of Gases
A gas consists of small particles that
move randomly with high velocities.
have essentially no attractive (or repulsive) forces toward each other.
have a very small volume compared to the volume of the containers they occupy.
are in constant motion.
have kinetic energies that increase with an increase in temperature. 4

5. Properties of Gases Gases are described in terms of four properties:
1. pressure (P),
2. volume (V),
3. temperature (T), and
4. amount (n). 5

6. Learning Check Identify the property of a gas (temperature, volume,
or pressure) that is described by each of the
following:
A. increases the kinetic energy of gas particles
B. the force of the gas particles hitting the walls of the container
C. the space that is occupied by a gas 6

7. Solution Identify the property of a gas that is described by
each of the following:
A. increases the kinetic energy of gas particles
temperature
B. the force of the gas particles hitting the walls of the container
pressure
C. the space that is occupied by a gas
volume 7