Kinetic Molecular TheoryPhase diagrams

Engage1. What inflates the balloon?2. Where is the gas coming from?3. Which gas production is a physical

change? Why?4. Which gas production is a chemical

change? Why?5. If you could zoom in really far inside a

balloon, what do you think the air inside would look like?

6. How will you describe the gas inside the balloon? Describe at least 3 behavior of gas molecules.

Explore Draw the phase diagram in

notebooks and label the parts.

Explain: Kinetic Molecular Theory of Matter• Kinetic energy: the energy an object has because of its motion

• Kinetic molecular theory: states that all matter consists of tiny particles that are in constant motion

• Kinetic molecular theory as it applies to gases includes five postulates.◦ 1. The particles in a gas are considered to be small, hard

spheres with an insignificant volume. The distance between particles in a gas is larger than the distance

between particles in a solid or liquid. There is only empty space between the particles.

◦ 2. No attractive or repulsive forces exist between the particles of a gas.

◦ 3. The motion of the particles in a gas is rapid, constant, and random. Gases fill their containers regardless of shape and volume. The particles travel in straight-line paths until they collide with another

particle or another object, such as the wall of their container. Their path of uninterrupted travel in a straight line is very short

◦ 4. All collisions between particles in a gas are perfectly elastic. During an elastic collision, kinetic energy is transferred without loss from

one particle to another, and the total kinetic energy remains constant. ◦ 5. The Kelvin temperature of a substance is directly

proportional to the average kinetic energy of the particles of the substance. The particles in helium gas at 200 K have twice the average kinetic

energy as the particles in helium gas at 100 K.

Elaborate- HomeworkDraw a chart and in your own

words, summarize the 5 postulates of the Kinetic molecular theory (5 minutes only)

EvaluateTriple Point AssessmentPhase diagram