Chemistry 14 Friday, September 29, 2006

Chemistry 14 Friday, September 29, 2006 - a P Pressure i...

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Friday, September 29, 2006 Chemistry GAS STATION How do molecules move around? How do the properties of a gas interrelate? Text: Sections 7.0-7.2 STATES OF MATTER 1. Gas: random motion throughout container a. Molecules apart 2. Liquid: random motion throughout container a. Molecules touching 3. Solid: oscillation around fixed positions a. Molecules touching KINETIC MOLECULAR THEORY 1. Molecules move with a distribution of speeds distribution of energies 2. KE = ½ mv 2 LIGHTER THINGS GO FASTER ave. KE mass ave. speed 3. Average KE = T (Average KE = THERMAL E) a. Two gasses at same T i. Same ave. KE IDEAL GAS LAW 1. “Ideal Gas” a. Particles are few and far between b. Particles don’t interact 2. PV = nRT (P, V, T are measurable)
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Unformatted text preview: a. P: Pressure i. Measure with barometer b. V: Volume of container c. T: Absolute Temp i. In Kelvin d. n: # of moles of gas e. R = PV/nt = .0821 L-atm/mol-K “Ideal Gas Constant” Friday, September 29, 2006 3. PV = nRT allows predictions a. P vs. V while T is constant i. P is inversely proportional to V b. P vs. T while V is constant i. P is directly proportional to T c. V vs. T while P is constant i. V is directly proportional to T 4. Some math corrections for “real gases” GOALS • Describe molecular nation in g,l,s • Compare KE’s speeds of gases • Make predictions using PV = nRT...
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Chemistry 14 Friday, September 29, 2006 - a P Pressure i...

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