Ch 6: Gases
Kinetic Molecular Theory
Ideal gas molecule in a container:
Notable aspects of the ideal gas model:
- Molecules travel in straight lines, and obey Newton’s laws
- Collisions are perfectly elastic (no energy is lost in collisions)
- Molecules do not interact with each other
- Molecules have no volume
The Ideal Gas: Animation
To illustrate the behavior of an ideal gas molecule, click on the link below.
http://www.chm.davidson.edu/ChemistryApplets/KineticMolecularTheory/BasicConcepts.html
If you are a football fan, you can study the application of the gas laws using the “deflate gate” claims against Tom Brady and the Boston Patriots:
Required knowledge for exam
Ideal Gas Law
PV = nRT (note: T = Kelvin)
R = 0.08206 L • atm / mole • K
Know the following, or else know how to derive them from the Ideal Gas Law:
· Boyle’s Law: PV = k P1V1 = P2V2
· Charles Law: V = bT V1/T1 = V2/T2
· Avogadros’s Law:V = na V1/n1 = V2/n2
Kelvin Conversion from Celsius
Tk = Tc + 273
Pressure Unit Conversions
1 atm = 760 mm Hg atm = atmosphere
1 atm = 760 tor tor = Torricelli
1 atm = 14.7 psi psi = pounds per square inch
1 atm = 101,325 Pa Pa = Pascal
STP = ? T = 273K; P = 1 atm