1 / 19

Assignment

Assignment. Complete pre-assessment test. Read Chapter 10, pp.302-325, and define vocabulary. Learning Log. Write down at least 5 things you know about gases. Gases are a part of our everyday life. Ch. 10 & 11 - Gases. I. Physical Properties (p. 303 - 312). Kinetic-Molecular Theory.

arion
Download Presentation

Assignment

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Assignment • Complete pre-assessment test. • Read Chapter 10, pp.302-325, and define vocabulary.

  2. Learning Log Write down at least 5 things you know about gases.

  3. Gases are a part of our everyday life

  4. Ch. 10 & 11 - Gases I. Physical Properties(p. 303 - 312)

  5. Kinetic-Molecular Theory • States that the particles of matter are always in motion. • Can be used to explain the properties of solids, liquids and gases based on the energy of particles and the forces that act between them.

  6. A. Kinetic-Molecular Theory of Gases • Ideal gas – an imaginary gas that perfectly fits all the assumptions of the kinetic-molecular theory • (5) Assumptions - Particles in an ideal gas • 1. Are very far apart - gases are mostly empty space • 2. Have elastic collisions.

  7. A. Kinetic-Molecular Theory of Gases • 3. are in constant, random, straight-line motion. • 4. don’t attract or repel each other. • 5. have an avg. KE directly related to Kelvin temperature. KE = ½ mv2 all gases at same temp have same KE lighter gases have higher speeds than heavier gases

  8. B. KMT and the Nature of Gases • Expansion – gases expand to fill any container. • random motion, no attraction • Fluidity -gases are fluids (like liquids). • no attraction • Low density - gases have very low densities. (1/1000) • lots of empty space, particles far apart

  9. B. KMT and the Nature of Gases • Compressibility – gases can be compressed. • lots of empty space, particles far apart • Diffusion and effusion – gases undergo diffusion & effusion. • random motion, low mass gases faster

  10. C. Real Gases • Real gas – does not behave completely according to the assumptions of the kinetic-molecular theory • Particles in a REAL gas… • have their own volume • attract each other

  11. C. Real Gases • Gas behavior is most ideal… • at low pressures • at high temperatures • in nonpolar atoms/molecules

  12. D. Pressure Which shoes create the most pressure?

  13. D. Pressure • Barometer • measures atmospheric pressure • Manometer • measures contained gas pressure

  14. D. Pressure • KEY UNITS AT SEA LEVEL 101.325 kPa (kilopascal) 1 atm 760 mm Hg 760 torr 14.7 psi

  15. E. STP Standard Temperature & Pressure 0°C273 K 1 atm101.325 kPa -OR- STP

  16. F. Temperature K = ºC + 273 ºF -459 32 212 ºC -273 0 100 K 0 273 373 • Always use absolute temperature (Kelvin) when working with gases.

  17. Practice Problems - Pressure • The average atmospheric pressure in Denver, Colorado, is 0.830 atm. Express this pressure (a) in mm Hg and (b) in kPa. (a) 0.830 atm x 760 mm Hg = 631 mm Hg 1atm (b) 0.830 atm x 101.325 kPa = 84.1 kPa 1atm

  18. Practice Problems - Temperature • Convert -273°C to Kelvin temperature. -273 + 273 = 0 K • Convert 20 K to Celsius temperature. 20 – 273 = -253°C

  19. Homework Assignment • Complete #17-19 on p. 327 of the textbook.

More Related