c161l11_09_25

# c161l11_09_25 - W When they collide with the wall they...

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Chapter 5 Chapter 5 Gases

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States of Matter States of Matter W Solid - definite shape W Liquid - fluid, adopts the shape of the container that holds it, incompressible W Gas - fluid, fills the entire container, compressible W Other rarer states Plasma - sea of ions and electrons, found in stars
Molecular Model of Gases Molecular Model of Gases W A model in science is a simplification we use to describe complicated phenomena. W The model is to treat molecules as separate, unreactive spheres No interactions other than to bounce off each other or the walls Rapid motion ~300 m/s. Collisions transfer momentum Volume of particles negligible

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More on the Model More on the Model W While each molecule is traveling with a random speed and direction, there is an average speed (kinetic energy ½mv 2 ) The average speed is determined by the temperature Temperature and kinetic energy are 2 forms of the same thing.

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Pressure Pressure W Each particle has a particular momentum

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Unformatted text preview: W When they collide with the wall they exert a force faster particles, more frequent collisions more particles, more collisions larger container, fewer collisions W Pressure is force per unit area W Collisions are pressure! Units of pressure Units of pressure W F = m a = kg m s-2 in SI units W P = F/A = kg m s-2 /m 2 = kg m-1 s-2 in SI units W kg m-1 s-2 = Pa very small unit. Atmospheric pressure is 101325 Pa W Other units atm = 101325 Pa Torr (or mm Hg) 1 atm = 760 Torr P= P= Gdh Gdh m/s m/s 2 kg/m kg/m 3 m = kg m m = kg m-1 s-2 By saying By saying mm Hg mm Hg we mean take this height we mean take this height Gd Gd Hg Hg Gd Gd Hg Hg is constant is constant Measuring pressure Measuring pressure Measures absolute pressure Measures difference in pressure Pressure is an Intensive Pressure is an Intensive property property...
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## This note was uploaded on 11/12/2011 for the course CHEM 160:161 taught by Professor Siegel during the Fall '09 term at Rutgers.

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c161l11_09_25 - W When they collide with the wall they...

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