CHEM NOTES

CHEM NOTES - formation of gases: many elements and...

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formation of gases : many elements and compounds are already gases at room temperature sublime – when solids are heated and turned into gases vaporize – when liquids are heated and turned into gases gases are characterized by pressure, volume, and temperature gas: composed of particles (atoms or molecules) in constant and random motion pressure : pressure is related to force force = mass * acceleration (F=ma) acceleration = change in velocity (m/s 2 ) mass (in kilograms) times acceleration (in meters per second squared) = force (in kilograms times meters per second squared which equals Newton’s) pressure = force (P = F/A) area pressure is measured in Newton’s which is equivalent to 1 Pascal m 2 volume : a solid has its own shape and volume a gas forms to the container and fills the entire container a liquid occupies a portion of a container the volume of a gas equals the volume of the container volume of containers: box: volume = length*width*height (V=lwh) sphere: volume = 4/3* π *radius 3 (V=4/3 π r 3 ) cylinder: volume = π *radius 2 *height (V= π r 2 h) atomic pressure : measured by a barometer the pressure of the atmosphere is equal to the pressure of the supported column of mercury in a barometer pressure doesn’t depend on the radius of the cylinder the pressure of mercury equals density*height*gravity (P=dhg) which also equals the atmospheric pressure barometer equations: atmospheric pressure = density of the liquid*height of the liquid*gravity (P atm =d l h l g l ) if your comparing liquids: density of mercury*height of mercury = density of liquid*height of liquid (d Hg h Hg =d l h l ) the standard atmospheric pressure supports a column of mercury 760mm high the unit “mm Hg” is called a torr atmospheric pressure is related to weather high pressure= cloudless, sunny day
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low pressure= clouds, storms, rain really low pressure= tornadoes and hurricanes when you suck on a straw to drink a coke you create a partial vacuum example problem: If the barometer pressure is 763 torr, what height would the water be? The density of Hg is 13.6 g/mL and the density of water is 1 g/mL need to know: atmospheric pressure supports a column of mercury 763 mm high P atm
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This note was uploaded on 04/25/2008 for the course V 002 taught by Professor Staff during the Spring '06 term at NYU.

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CHEM NOTES - formation of gases: many elements and...

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