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Welcome

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Welcome to

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Welcome to Dr. Chus

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Welcome to Dr. Chus Vodcast

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Todays

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Todays topic is …

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Gases Part B: Gas Laws Dr. Chu River Dell Regional High School

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The barometer was invented by Evangelisto Torricelli in 1643. Barometer The temperature scale

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Websites: http://phet.colorado.edu/en/simulation/gas- properties http://www.mhhe.com/physsci/chemistry/ess entialchemistry/flash/gasesv6.swf

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Conditions: given amount of gas at constant temperature Relationship: PV = constant

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A sample of gas in a balloon is compressed from 7.00 L to 3.50 L. The pressure at 7.00L is 125 KPa. What will the pressure be at 2.50L if the temperature remains constant?

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Conditions: given amount of gas at constant pressure Relationship: V/T = constant

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A gas sample at 20.0 C occupies a volume of 3.00 L. If the temperature is raised to 50.0 C, what will the volume be if the pressure remains constant?

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Conditions: given amount of gas at constant volume Relationship: P/T = constant

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The pressure of a gas in a tank is 4.00 atm at 200.0 C. If the temperature rises to 280.0 C, what will be the pressure of the gas in the tank?

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Combination of Boyles, Charles, and Gay- Lussacs Laws. Relationship: PV/T = constant

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A gas at 70.0KPa and 10.0 C fills a flexible container with an initial volume of 4.00L. If the temperature is raised to 60 C and the pressure is raised to 80.0 KPa, what is the new volume?

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Carefully read the problem and list all the known and unknown parameters. Use the 1 and 2 for designations of start and end states, respectively. Carefully label each parameter with 1 or 2 subscript to keep track. If any of the three parameter is held constant, that parameter would have the same value for both states 1 and 2. Then the identical parameter can be cancelled from the combined gas law and individual gas laws reconstitute.

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Submarines need to be extremely strong to withstand the extremely high pressure of water pushing down on them. An experimental research submarine with a volume of 15,000 liters has an internal pressure of 1.2 atm. If the pressure of the ocean breaks the submarine forming a bubble with a pressure of 250 atm pushing on it, how big will that bubble be?

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A gas that has a volume of 28 liters, a temperature of 45 0 C, and an unknown pressure has its volume increased to 34 liters and its temperature decreased to 35 0 C. If I measure the pressure after the change to be 2.0 atm, what was the original pressure of the gas?

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1. A gas takes up a volume of 17 liters, has a pressure of 2.3 atm, and a temperature of 299 K. If I raise the temperature to 350 K and lower the pressure to 1.5 atm, what is the new volume of the gas? 2. A gas has a temperature of 14 0 C, and a volume of 4.5 liters. If the temperature is raised to 29 0 C and the pressure is not changed, what is the new volume of the gas? 3. If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900 K, what will be the volume of the gas if I decrease the pressure to 45 atm and decrease the temperature to 750 K?

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1. A gas takes up a volume of 17 liters, has a pressure of 2.3 atm, and a temperature of 299 K. If I raise the temperature to 350 K and lower the pressure to 1.5 atm, what is the new volume of the gas? [30.5L] 2. A gas has a temperature of 14 0 C, and a volume of 4.5 liters. If the temperature is raised to 29 0 C and the pressure is not changed, what is the new volume of the gas? [4.74L] 3. If I have 21 liters of gas held at a pressure of 78 atm and a temperature of 900 K, what will be the volume of the gas if I decrease the pressure to 45 atm and decrease the temperature to 750 K? [30.3L]

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