MU #1 The concept of an ideal gas is a model to explain the behavior of gases.

MU #2 Kinetic Molecular Theory (KMT) for an ideal gas states that all gas particles:

• are in random, constant, straight-line motion.

• are separated by great distances relative to their size; the volume of the gas particles is considered negligible.

• have no attractive forces between them.

• have collisions that may result in the transfer of energy between gas particles, but the total energy of the system remains constant.

MU #3 A real gas is most like an ideal gas when the real gas is at low pressure and high temperature.

At high pressures gas particles are close therefore the volume of the gas particles is considered.

At low temperatures gas particles have low kinetic energy therefore particles have some attractive force

Example

Dry ice, liquid oxygen and nitrogen

MU #4 The collision theory states that a reaction is most likely to occur if reactant particles collide with the proper energy and orientation.

TEST YOUR UNDERSTANDING

8/03

16 A real gas behaves more like an ideal gas when the gas molecules are
        (1) close and have strong attractive forces between them (3) far apart and have strong attractive forces between them
        (2) close and have weak attractive forces between them (4) far apart and have weak attractive forces between them

1/04

14 Under which conditions does a real gas behave most like an ideal gas?
        (1) at low temperatures and high pressures (2) at low temperatures and low pressures
        (3) at high temperatures and high pressures (4) at high temperatures and low pressures

6/04

16 Helium is most likely to behave as an ideal gas when it is under
        (1) high pressure and high temperature (2) high pressure and low temperature

        (3) low pressure and high temperature (4) low pressure and low temperature

8/04

15 The concept of an ideal gas is used to explain

       (1) the mass of a gas sample (2) the behavior of a gas sample  (3) why some gases are monatomic (4) why some gases are diatomic

6/05

16 The kinetic molecular theory assumes that the particles of an ideal gas 

                    (1) are in random, constant, straight-line motion (2) are arranged in a regular geometric pattern 

                    (3) have strong attractive forces between them (4) have collisions that result in the system losing energy 

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