Lecture 5_Chem 102SP-1(2)

Lecture 5_Chem 102SP-1(2) - Chapter 5 Gases 3 States of...

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Chapter 5 Gases
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3 States of Matter SOLID Definite Volume Definite Shape Vibrations LIQUID Definite Volume No Definite Shape More movement GAS Volume and Shape of its container Most movement
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Gases There are also some compounds that are gases at room tempertaure NO, SO 3 , 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.
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Device used for measuring the pressure of a gas in a container. Manometer
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Pressure SI units = = =1Pascal (Pa) 1 standard atmosphere = 101,325 Pa 1 standard atmosphere = 1 atm = 760 mm Hg = 760 torr 2 m N force Pressure = area 2 meter Newton
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Example 1.The pressure of a gas is measured as 2.5 atm. Represent this pressure in both torr and pascals. Pressure Conversions   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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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) Boyle’s Law 1 1 2 2 = P V P V 
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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? 1 1 2 2 = P V P V 
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• A sample of gas occupies 21 liters at a pressure of 2.2 atm. What would be the volume if the pressure was increased to 6.2 atm? • A sample of O 2 occupies 10.0 L at 785 torr. At what pressure would it occupy 14.5 L? Boyle’s Law Practice
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Volume and Temperature are directly related (constant P and n ) V=bT ( b is a proportionality constant) Temperature in Kelvin K = °C + 273 0 K is called absolute zero. Charles’s Law 12 = VV TT
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Charles’s Law Example 3. Suppose a balloon containing 1.30 L of air at 24.7°C is placed into a beaker containing liquid nitrogen at –78.5°C. What will the volume of the sample of air become (at constant pressure)? 12 = VV TT Kelvin
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• What would the final volume be if 247 mL of gas at 22 ºC is heated to 98 ºC, if the pressure is held constant? • A balloon containing 2.50 L of air at 25.0 ºC decreases to a volume of 2.20 L when placed in a freezer at constant pressure. What is the temperature of the freezer in ºF? Charle’s Law Practice
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Gay-Lussac’s law Pressure and Temperature are directly related (constant V and n ) P=bT ( b is a proportionality constant) 2 2 1 1 T P T P Temperature in Kelvin
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Example 4.
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Lecture 5_Chem 102SP-1(2) - Chapter 5 Gases 3 States of...

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