21 Kinetic Molecular Theory

21 Kinetic Molecular Theory - To calculate the pressure...

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1 1 ± To calculate the pressure that a statue exerts on a table, you need to know the area of the base. What is the area in m 2 of the base if it is a square 10 cm on a side? A) 0.01 m 2 B) 0.1 m 2 C) 1 m 2 D) 10 m 2 ± (10 cm x 1 m/100 cm)(10 cm x 1 m/100 cm) = 0.01 m 2 2 Foundations of Chemistry p. 213
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2 3 ± 1. A gas consists of tiny molecules with large distances between them so their volume is negligible. ± 2. They are in constant random motion. ± 3. Forces of attraction and repulsion are negligible. ± 4. Collisions are like hard spheres colliding, no translational energy is lost (elastic). ± Pressure on the walls of a container results from continual collisions of the molecules with the walls. ± 5. Average kinetic energy of the molecules is proportional to the Kelvin temperature. Model: Postulates of the Kinetic Molecular Theory http://intro.chem.okstate.edu/1314f00/laboratory/glp.htm 4 Average Kinetic Energy (<E k >) and Kelvin Temperature (T) ± m = mass of a molecule ± v = speed of a molecule ± <v 2
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21 Kinetic Molecular Theory - To calculate the pressure...

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