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Gases Day 2

Gases Day 2. Standard 4:The kinetic molecular theory describes the motion of atoms and molecules and explains the properties of gases. Objective. Catalyst. I can explain gas properties using the kinetic molecular theory of gases. Convert the temperatures into Kelvin:

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Gases Day 2

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  1. Gases Day 2 Standard 4:The kinetic molecular theory describes the motion of atoms and molecules and explains the properties of gases.

  2. Objective Catalyst • I can explain gas properties using the kinetic molecular theory of gases. • Convert the temperatures into Kelvin: • Warmest November day in LA: 37.7° C (100° F) on November 1, 1966. • Coldest November day in LA: 1.1 ° C (34° F) on November 19, 1886. Agenda • Catalyst • Balloon in a bottle • KMT!Notes & Videos • KMT practice • Exit Slip • Homework: • pp. 422 # 1, 3, 7, 11

  3. Bad Guys Like Gas, Why? • Video Focus Question: How does the gas move in the video? Thinking about how gases move, what are some benefits and disadvantages of using gas as a weapon? • http://www.youtube.com/watch?v=iOkPaSwXC6s

  4. Balloon in a Bottle Activity

  5. Mini Vocabulary Review • Volume • a measure of the size of an object in three dimensional space. • kinetic energy • the energy of an object that is due to the object’s motion. • Pressure • the amount of force exerted per unit area on a surface. • temperature • a measure of the average kinetic energy of the particles in an object.

  6. The Kinetic Molecular Theory • The Kinetic Molecular Theory is a way to explain the properties of gases by examining the movement of gas particles at the microscopic level. • Gases that obey the Kinetic Molecular Theory are called Ideal Gases • Just like there are no “ideal” people, there are actually no ideal gases. But gases do approach ideal behavior.

  7. The KINETIC MOLECULAR THEORY! 1. Gases consist of tiny particles (molecules or atoms). 2. The particles are TINY compared to the space between them.So, we do not count the volume of the particles. Space between = BIG Itty-bity Itty-bitty

  8. KMT continued 3. The particles are in constant RANDOM motion. The particles collide with the walls of the container. These collisions result in pressure. Exerts pressure

  9. More KMT! 4. The gas particles do not attract or repel each other. They move randomly. 5. The average kinetic energy of the gas is proportional to the Kelvin temperature. Kinetic Energy Temperature

  10. Let’s use the KMT to explain some gas properties. Pressure & Temperature Diffusion Pressure & Volume Pressure & # of molecules We are about to do a demonstration and watch some videos. Take notes and draw pictures in the boxes on your worksheet. Think about how to explain what you see using the KMT (think about the constant and random motion of particles).

  11. Diffusion • Diffusion is the movement of particles from regions of high concentration to low concentration. • The random movement of gas particles causes diffusion.

  12. Pressure and Temperature • When temperature increases, pressure ________. • When temperature decreases, pressure _______. • http://www.youtube.com/watch?v=HiLeji8bLOk • Think, Pair, Share: What happened in the video and why?

  13. Pressure and Volume • As volume increases, pressure ________. • As volume decreases, pressure _______. • http://www.grc.nasa.gov/WWW/k-12/airplane/aboyle.html • http://www.youtube.com/watch?feature=endscreen&v=ULdmv-iPQvA&NR=1 • Think, Pair, Share: What happened in the video and why?

  14. Pressure and Number of Moles • As the number of molecules increases, pressure __________. • As the number of molecules decreases, pressure __________. • http://www.youtube.com/watch?v=t-Iz414g-ro • Think, Pair, Share: What happened in the video and why?

  15. KMT Practice: Example • Karimbought a new soccer ball and it came deflated. As he pumps air molecules into the soccer ball, the pressure inside the soccer ball _________. Why? • With more molecules moving randomly and rapidly in the ball, they will hit the sides more, increasing pressure.

  16. Exit Slip 4a & 4b 4a: (1) Aerosol cans have a warning not to dispose of them in fires. Why? (use KMT) (2) As the kinetic energy of molecules increases, the temperature __________. Why? 4b: (3) Methane gas diffuses through air because the molecules are: (a) moving randomly (c) traveling slowly (b) dissolving quickly (d) expanding steadily

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