CHEM 1001 Lecture Notes - Lecture 1: Rotational Energy, Atmospheric Pressure, Barometer

• School: Carleton University
• Department: Chemistry
• Course: CHEM 1001
• Professor: Robert Burk

Document Summary

Gases are useful; see slides (different uses and functions of different gases) Air is a mixture of gases; n2 (78. 1%), oxygen, water, ar, co2. Molecules have many ways to store energy: List continues on next slide: translational energy energy of motion of molecules through space, vibrational energy, rotational energy, electronic energy energy between electric charges. Temperature of a gas: measure of average translation kinetic energy of gas molecules, ke = 1/2mv^2 (translational velocity, flow of energy: Put heat into a system molecules move faster t is higher. Gases exert pressure: pressure (p) = force/area (n/m^2, 1pa = 1nm^-2, atmospheric pressure; pressure of atmosphere. Gravity pulls the air downward: pressure = 101,325 pa which in conversion = 101. 325 kpa. Important pressure units: 1pa = 1n/m^2, 1 bar = 100,000 pa, 1 atm = 101325 pa, 1 atm = 14. 69 lb/in^2, 1 atm = 760 mm hg = 760 torr. Liquids are not compressible only can be displaced.