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u9lectout - Unit 9: The Gas Laws Name: _ The Atmosphere an...

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Unit 9: The Gas Laws Name: ____________________ The Atmosphere an “ocean” of gases mixed together Composition nitrogen (N 2 )……………. oxygen (O 2 )……………. argon (Ar)………………. carbon dioxide (CO 2 )…. . water vapor (H 2 O)……… Depletion of the Ozone Layer O 3 depletion is caused by chlorofluorocarbons (CFCs). Uses for CFCs: refrigerants aerosol propellants The Greenhouse Effect 1
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2 Energy from Sun has short wavelengths ( λ s) and high energy. CO 2 and methane (CH 4 ) let this light in. Reflected light has longer λ s and less energy. CO 2 and CH 4 (“greenhouse gases ”) prevent reflected light from escaping, thus warming the atmosphere. Why more CO 2 in atmosphere now than 500 years ago? ______________________ _______________________ -- -- -- -- -- -- -- * What can we do? 1. Reduce consumption of fossil fuels. At home : On the road : 2. Support environmental organizations. 3. Rely on alternate energy sources. solar, wind energy, hydroelectric power The Kinetic Molecular Theory (KMT) -- -- deals w /“ideal” gas particles… 1. …are so small that they are assumed to have zero volume 2. …are in constant, straight-line motion 3. …experience elastic collisions in which no energy is lost 4. …have no attractive or repulsive forces toward each other 5. …have an average kinetic energy (KE) that is proportional to the absolute temp . of gas (i.e., Kelvin temp.) 2
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Theory “works,” except at high pressures and low temps. ** KE is related to mass and velocity (KE = ½ m v 2 ). More massive gas particles are slower than less massive gas particles (on average).
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u9lectout - Unit 9: The Gas Laws Name: _ The Atmosphere an...

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