CK-12-Chemistry Intermediate

http://www.ck12.org Chapter 13. States of Matter

b. 559 torr to kPa

c. 91.1 kPa to atm

d. 2320 mmHg to atm

9. A manometer is attached to an enclosed gas sample, as shown above (Figure13.4). The mercury rises 20
   mm higher on the side of the U-tube that is open to the air. The atmospheric pressure is 752 mmHg. What is
   the pressure of the gas sample in the bulb?


10. A sample of neon gas is at−25°C. What would be its Celsius temperature when the average kinetic energy of
    the particles is tripled?


11. The density of water is approximately 1/14th that of mercury. If the atmospheric pressure at a certain location
    is 750. mmHg, to what height (in m) would a column of water rise?

Further Reading / Supplemental Links

• Kinetic-MolecularTheory, http://students.ed.uiuc.edu/mrayon/kmt.html


• MeasuringGasPressure, http://www.wisc-online.com/objects/ViewObject.aspx?ID=GCH5004


• Air pressure not only affects us here on Earth, but also planes flying in the atmosphere. You can participate in
  a simulation at http://www.grc.nasa.gov/WWW/k-12/airplane/atmosi.html.


• Strength of atmospheric pressure:
  
  
  • Atmospheric pressure is stronger than you think! Watch a video that demonstrates a stick being broken
    by atmospheric pressure at http://www.youtube.com/watch?v=dpFb08pLw0E.
  
  
  • You can watch a demonstration of atmospheric pressure crushing a can at http://www.youtube.com/w
    atch?v=R5sZQFmX-jA.
  
  
  • Another great demonstration of the strength of atmospheric pressure is the crushing of this can (a big
    can—not a soda can!) http://www.youtube.com/watch?v=Jcl0A8Mu9xk.
  
  
  • If you are still not convinced about the strength of atmospheric pressure, watch this demonstration of
    water remaining inside an inverted Erlenmeyer flask http://www.youtube.com/watch?v=ZgMCz4RQY
    as.
  
  
  
  


• We may think it is cold in the winter and hot in the summer, but this simulation may change your mind about
  the temperature scale with which we are familiar http://www.pbs.org/wgbh/nova/physics/sense-of-scale-abso
  lute-zero.html.


• You can view an interactive timeline of the experiments leading to the determination of absolute zero at http
  ://www.pbs.org/wgbh/nova/physics/milestones-in-cold-research.html.


• You can participate in a simulation of the cascade process used to reach ultra-low temperatures at http://w
  ww.pbs.org/wgbh/nova/physics/reaching-ultra-low-temperatures.html.


• Watch a video of condensing oxygen gas using liquid nitrogen at http://www.youtube.com/watch?v=maEi6
  7gjtRQ.

Points to Consider

The particles of a liquid are much closer together than the particles of a gas, resulting in far different behaviors for
liquids as compared to gases.

• How does the kinetic energy of the particles in a liquid relate to the rate of evaporation of the liquid?


• How is the boiling point of a liquid defined?