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23 Cards in this Set
- Front
- Back
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Thermochemistry
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Study of energy and heat changes.
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Heat
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Flow of energy between two objects due to a temperature difference.
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Endothermic
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Energy flows into the system.
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Exothermic
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Energy flows out of the system
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critical temperature
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the temp above which the vapor cannot be liquefied no matter how much pressure is applied
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vapor pressure
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the pressure exerted by a vapor, Gas molecules escape from a liquid in a sealed container, collide with the walls of the container & produce vapor pressure, gas molecules will niold up pressire and will start condensing back into a liquid, equililbrium forms same # of molecules vaporizing & conodensing so vapor pressure remains the same
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absolute zero
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the temperature at which gas would have [zero] volume; the temperature -273.15 degrees C, given a value of [zero] in the Kelvin scale (317)(two words)
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atmosphere of pressure
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symbol is 'atm'; exactly equivalent to 760 mm Hg [of pressure] (311)(three words)
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millimeters of mercury
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equal to one torr; the common unit of pressure in the U.S.(311)(three words, _ of _)
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partial pressure
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the [pressure] of each gas in a mixture (322)(two words)
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pressure
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the force per unit area on a surface (308)
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real gas
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a [gas] that does not behave completely according to the assumptions of the kinetic-molecular theory (306)(two words)
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kinetic-molecular theory
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a [molecular theory] based on the idea that molecular particles of matter are always in motion (303)(three words, first two hyphenated)
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diffusion
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spontaneous mixing of the particles of two...
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ideal gas
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a hypothetical gas that perfectly fits all...
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joule
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energy unit; 1 calorie = 4.184
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first law of thermodynamics
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the energy of the universe is constant
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second law of thermodynamics
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the universe's entropy is always increasing
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hess's law
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change in enthalpy in going from a given set of reactants to a given set of products does not depend on # steps in the reaction
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temperature
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measure of random motions (avg. kinetic energy) of a substance's components
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law of conservation of energy
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states that energy can be converted but can not be created nor destroyed
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critical point
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Indicates the critical temperature and the critical pressure.
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freezing
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The physical change of a liquid to a solid by removal of energy as heat.
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