10.1,10.2 Properties Of Gases And Pressure
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10.1,10.2 Properties Of Gases And Pressure

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10.1,10.2 Properties Of Gases And Pressure Presentation Transcript

  • 1. Chapter 10 Gases
    • 10.1 Properties of Gases
    • 10.2 Gas Pressure
  • 2. Kinetic Theory of Gases
    • A gas consists of small particles that:
    • Move rapidly in straight lines
    • Have essentially no attractive (or repulsive) forces
    • Are very far apart
    • Have very small volumes compared to the volume of the container they occupy
    • Have kinetic energies that increase with an increase in temperature
  • 3. Properties of Gases
    • Gases are described in terms of four properties: pressure (P), volume (V), temperature (T), and amount (n).
  • 4.
    • Gas pressure:
    • Is described as a force acting on a specific area
    • Pressure (P) = Force
    • Area
    • Has units of atm, mm Hg, torr, and pascals
    • 1 atmosphere (1 atm) is 760 mm Hg
    • 1 mm Hg = 1 torr
    • 1.00 atm = 760 mm Hg = 760 torr
    Gas Pressure
  • 5. Units of Pressure
    • Gas pressure,
    • Is described as a force acting on a specific area
  • 6.
    • A. What is 475 mm Hg expressed in atm?
    • 1) 475 atm
    • 2) 0.625 atm
    • 3) 3.61 x 10 5 atm
    • B. The pressure in a tire is 2.00 atm. What is this pressure in mm Hg?
    • 1) 2.00 mm Hg
    • 2) 1520 mm Hg
    • 3) 22 300 mm Hg
    Learning Check
  • 7.
    • A. What is 475 mm Hg expressed in atm?
    • 2) 0.625 atm
    • 475 mm Hg x 1 atm = 0.625 atm
    • 760 mm Hg
    • B. The pressure of a tire is measured as 2.00 atm. What is this pressure in mm Hg?
    • 2) 1520 mm Hg
    • 2.00 atm x 760 mm Hg = 1520 mm Hg
    • 1 atm
    Solution
  • 8. Atmospheric Pressure
    • The atmospheric pressure:
    • Is the pressure exerted by a column of air from the top of the atmosphere to the surface of Earth
    • Is about 1 atmosphere or a little less at sea level
  • 9. Altitude and Atmospheric Pressure
    • Atmospheric pressure:
    • Depends on the altitude and the weather
    • Is lower at high altitudes where the density of air is less
    • Is higher on a rainy day than on a sunny day
  • 10. Barometer
    • A barometer:
    • Measures the pressure exerted by the gases in the atmosphere
    • Indicates atmospheric pressure as the height in mm of the mercury column
  • 11.
    • A. The downward pressure of the Hg in a barometer is _____ than (as) the pressure of the atmosphere.
    • 1) greater 2) less 3) the same
    • B. A water barometer is 13.6 times taller than a Hg barometer (D Hg = 13.6 g/mL) because:
    • 1) H 2 O is less dense
    • 2) H 2 O is heavier
    • 3) air is more dense than H 2 O
    Learning Check
  • 12.
    • A.The downward pressure of the Hg in a barometer is 3) the same (as) the pressure of the atmosphere.
    • B. A water barometer is 13.6 times taller than a Hg barometer (D Hg = 13.6 g/mL) because:
    • 1) H 2 O is less dense
    Solution