1. In your NOTEBOOK: Write down the question and answer.
Do Now:(on Edmodo)
In your NOTEBOOK: Write down the question and answer.

2. What are your personal experiences with Solids, Liquids and Gases?
All of your personal experiences are at a “sensory level”
Observe matter and the changes through your 5 senses.
Making observations is the first step in “doing science”
To explain observations  develop a theory
Scientific theory – explains observations and can be used to predict outcomes.

3. Solids, Liquids and Gases
What do you know about solids, liquids and gases?
What is the difference between the different particles?

4. Solids, Liquids, and Gases
Definite shape
Rigid structure
Particles packed tightly together
Vibrate in place
Cannot move past each other

5. Solids, Liquids, and Gases
Definite shape
Rigid structure
Particles packed tightly together
Vibrate in place
Cannot move past each other
Flows
Takes the shape of the container
Particles are mobile, can move past each other but can’t move too far apart

6. Solids, Liquids, and Gases
Definite shape
Rigid structure
Particles packed tightly together
Vibrate in place
Cannot move past each other
Flows
Takes the shape of the container
Particles are mobile, can move past each other but can’t move too far apart
No definite shape
Particles not strongly attracted to each other
Particles are VERY far apart
Move at high speeds in straight lines

7. Kinetic Molecular Theory (KMT)
Gas molecules move because of how much kinetic energy they have
Kinetic energy (KE) – energy of motion
Depends on an object’s mass and velocity
If you have 2 objects with different masses (baseball and ping pong) – going same speed- which will hurt more? has more KE? Baseball
If the two objects have the same mass (like 2 cars) – move at diff speed- which has more KE?

8. KMT - Behavior of gases
Contains postulates – accepted statements used as a basis for developing explanations
Gases consist of tiny particles (molecules) that are great distances apart
Gas molecules are in constant, random motion. They collide and cause gas pressure
Collisions are elastic
Elastic – when molecules collide, total energy is not lost

9. As temperature increases, the average KE increases.
Gas molecules only interact during collisions
The KMT is used to explain gas behaviors. If a gas follows these rules… Called “Ideal Gas”

10. Practice problems the number of super-bounce balls in the box
1. Decide which of these four gas variables—volume, temperature, pressure, and number of molecules—best matches each of the following, and explain each choice.
the number of super-bounce balls in the box
the size of the box
the vigor with which you shake the box
the number and force of collisions with the box walls of the randomly moving super-bounce balls

11. 2. How does each of the following changes relate to what you have learned about gas behavior?
The vigor of shaking and the number of super-bounce balls remain the same, but the size of the box is decreased.
The size of the box and the number of super-bounce balls remain the same, but the shaking becomes more vigorous.
The size of the box and the vigor of shaking are kept the same, but the number of super-bounce balls is increased.
3. Suggest another situation similar to those in Question 2 that can serve as an analogy for the behavior of gases. Explain how the situation is analogous.

12. 4. Describe your own analogy that might be useful for modeling gas behavior.
Identify features of your analogy that relate to features of KMT and T-V-P relationships for gases.
Point out some key limitations of your analogy.