Lecture%205%20part%20I%20Chem%20102

# Lecture%205%20part%20I%20Chem%20102 - Chapter 5 Gases Part...

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Chapter 5 Gases Part I

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3 States of Matter SOLID Definite Volume Definite Shape Vibrations GAS Volume and Shape of its container Most movement LIQUID Definite Volume No Definite Shape More movement
Gases There are also some compounds that are gases at room tempertaure CO, CO 2 P, V, n and T define the state of your gas!!!

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Barometer Device used to measure atmospheric pressure. Mercury flows out of the tube until the pressure of the column of mercury standing on the surface of the mercury in the dish is equal to the pressure of the air on the rest of the surface of the mercury in the dish.
Manometer Device used for measuring the pressure of a gas in a container.

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Pressure force Pressure = area SI units = = =1Pascal (Pa) 1 standard atmosphere = 101,325 Pa 1 standard atmosphere = 1 atm = 760 mm Hg = 760 torr 2 m N 2 meter Newton
Pressure Conversions Example 1.The pressure of a gas is measured as 2.5 atm. Represent this pressure in both torr and pascals. () 3 760 torr 2.5 atm = 1.9 10 torr 1 atm ⎛⎞ ×× ⎜⎟ ⎝⎠ 5 101,325 Pa 2.5 atm = 2.5 10 Pa 1 atm

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Boyle’s Law Pressure and volume are inversely related (constant T , temperature, and n , # of moles of gas) PV = k ( k is a constant for a given sample of air at a specific T) 11 2 2 = PV PV × ×
Boyle’s Law Example 2. A sample of helium gas occupies 12.4 L at 23°C and 0.956 atm. What volume will it occupy at 1.20 atm assuming that the temperature stays constant?

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## This note was uploaded on 09/20/2010 for the course CHEM 102 taught by Professor Peterpastos during the Summer '08 term at CUNY Hunter.

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Lecture%205%20part%20I%20Chem%20102 - Chapter 5 Gases Part...

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