CHEM 120 Chapter Notes - Chapter 4-5: Kinetic Theory Of Gases, Pressure Measurement, Atmospheric Pressure

• School: McGill University
• Department: Chemistry
• Course: CHEM 120
• Professor: Laura Pavelka

Document Summary

4. 1 overview of the physical states of matter. Gas adopts shape of container & fills it: because particles are far apart and move randomly. Gas exerts pressure on the walls of its container. Earth"s gravity attracts atmospheric gases which exert equal force on all surfaces (at the same level) at 10. 1 n/cm2. If outside pressure is greater than inside pressure, it crushes the objects. The diameter doesn"t effect this: atmospheric pressure at sea level is 760 mmhg. Manometer: measure pressure of a gas in an experiment: height difference used to measure the pressure, the open ended manometer: we must know the atmospheric pressure to obtain the pressure of the gas. Si unit of pressure is pascal (pa) = 1 n/m2. 1 atm = 101. 325 kpa = 1. 01325 x 105 pa = 760 mmhg = 760 torr = 1. 01325 bar. Physical behavior of gas can be described by 4 variables: pressure, volume, temperature and amount (# of moles, n: they"re interdependent.