Lo 3 The student is able to select and apply mathematical relationships to mass data in order to justify a claim regarding the identify and/or estimated purity of a substance. (Sec 5, 7) lo 3

So far we have considered “what happens,” but not “why.”

• So far we have considered “what happens,” but not “why.”
• In science, “what” always comes before “why.”

• Copyright © Cengage Learning. All rights reserved

Postulates of the Kinetic Molecular Theory

• 1) The particles are so small compared with the distances between them that the volume of the individual particles can be assumed to be negligible (zero).

• Copyright © Cengage Learning. All rights reserved

Postulates of the Kinetic Molecular Theory

• 2) The particles are in constant motion. The collisions of the particles with the walls of the container are the cause of the pressure exerted by the gas.

• Copyright © Cengage Learning. All rights reserved

Postulates of the Kinetic Molecular Theory

• 3) The particles are assumed to exert no forces on each other; they are assumed neither to attract nor to repel each other.

• Copyright © Cengage Learning. All rights reserved