1. Grab a half sheet of scrap paper from the front.
Warm-Up 1/15/14
Grab a half sheet of scrap paper from the front.
On the sheet, write about what state of matter goo (from yesterday) is in. What evidence can you give to support your answer?
Don’t forget to write your name!
Ms. Au-Yeung will be collecting these sheets six minutes after the bell.

2. Objective Agenda -Use motion of gas molecules to explain diffusion.
-Describe properties of gases.
-Know how to convert between different pressure units.
Agenda
-Debrief Goo Lab
-Properties of Gas
-Pressure

3. -What state of matter is goo in? How do you know?
Review Warm-Up
Share with a neighbor:
-What state of matter is goo in? How do you know?
Will have class discussion

4. Motion of Gas Particles
Rapid
Constant
Random
Diffusion is caused by these motions

5. 1) Atmospheric (air) pressure
Properties of Gas
Card on Glass demo
How does it work?
Two reasons:
1) Atmospheric (air) pressure
2) Polarity of water

6. Atmospheric (Air) Pressure
The weight of air molecules pushing down on Earth
Earth’s atmosphere is pressing against us with a force of 14.7 lbs per square inch

7. Atmospheric (Air) Pressure
Earth’s atmosphere is pressing against us with a force of 14.7 lbs per square inch
What??
Imagine a 1 inch square cube column stretching from the Earth’s atmosphere to the ground.

8. Atmospheric (Air) Pressure
What??
Imagine a 1 inch square cube column stretching from the Earth’s atmosphere to the ground.
That column weights 14.7 lbs.

9. Atmospheric Pressure

10. What is gas pressure?
The result of collisions of billions of gas particles.
Pressure can be represented by using different units.
Units of Pressure include:
atmosphere (atm)
millimeters of mercury (mm Hg)
kilopascal (kPa)

11. Time to practice some conversions!!
Pressure Conversions
1 atm = 760 mm Hg
1 atm = kPa
Time to practice some conversions!!

12. The motion of gas particles is rapid, constant, and random.
Recap
The motion of gas particles is rapid, constant, and random.

13. Diffusion is a result of the motion of gas particles.
Recap
Diffusion is a result of the motion of gas particles.

14. Recap

15. Homework
Use pg. 385 in textbook. In your notebook, write a few sentences of how the following words connect:
kinetic theory 4. kinetic energy
motion 5. particle
collision