Grab a half sheet of scrap paper from the front.

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Presentation transcript:

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.

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

-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

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

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

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

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.

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.

Atmospheric Pressure

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)

Time to practice some conversions!! Pressure Conversions 1 atm = 760 mm Hg 1 atm = 101.3 kPa Time to practice some conversions!!

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

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

Recap

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