Chapter 15

Kinetic Molecular Theory

Some Amazing Things

Kinetic Theory

Kinetic Theory• All matter is composed of tiny particles.

Kinetic Theory• All matter is composed of tiny particles

– Atoms

Kinetic Theory• All matter is composed of tiny particles

– Atoms– Molecules

Kinetic Theory• All matter is composed of tiny particles

– Atoms– Molecules– Ions

Kinetic Theory

• These tiny particles are in constant motion.

Kinetic Theory• Collisions between moving particles are

perfectly elastic.– In an elastic collision there is no net change in

kinetic energy.

Pressure

• Pressure depends on two factors

1. Force

2. Area

Pressure =Force

Area

Examples of Pressure

Gas Pressure

Temperature• How hot or cold

• Average kinetic energy

Absolute Zero

K = °C + 273

How do we lower temperature?

• We slow down the particles.

Kinetic Energy

KE = ½ mv2

When considering kinetic energy we must consider two factors.

1. Mass

2. Velocity

You’ve been bad and you were caught!

New Discipline System

Wow! Mr. Taylor-Lehman isn’t here

Do Not Touch

HCNH2S

Or DieStink

Homework

• Worksheet #34 “Temperature and Particle Motion”