Date post: | 30-Dec-2015 |
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Open-Notes QUIZ TODAY
Over: Pressure, Fluids, Gas Laws
Gas Laws
Bellwork – When gas in a hot-air balloon is heated, does it become more dense or less dense
( why does the balloon rise? )
Gas Laws
Bellwork – When gas in a hot-air balloon is heated, does it become more dense or less dense
( why does the balloon rise? )The gas is less dense / more spread out
Particles are further apart
Gas Laws
• How did we define a LAW?
Gas Laws
• How did we define a LAW?
• PREDICTS some action or behavior
• Gas Laws predict gas behavior in specific conditions
• CONDITIONS are Pressure, Temperature, Volume
Boyle’s Law• Product of pressure and volume is constant• Pressure and Volume are INVERSELY Proportional
• P1V1 = P2V2 = CONSTANT
• “1” indicates initial conditions or a “before”
• “2” indicates final conditions or an “after”
Gay-Lussac’s Law
Charles’s Law
Go back to Labtops –TAKE NOTES
• Again at the PhET site, search for “Gas Properties” simulation
• RUN simulation
• Add gas ( choose light species ) – set value to 1
• See that this number tells you # of particles
• Increase gas value to 150 (USE PUMP , then adjust)
Example of Boyle’s Law
• If a gas has a volume of 325 mL at a pressure of 478 mmHg, what will the pressure be at a volume of 416 mL?
• P1V1 = P2V2 = CONSTANT
Example of Boyle’s Law
•P1V1 = P2V2 = CONSTANT
•( 478 ) * ( 325 ) = 155350 ( our constant )
•155350 = P2V2 = P2 * ( 416 )
•P2 = 155350 / 416 = 373 mmHg
Using Boyle’s Law
• From this example, how are pressure and volume related?
• As Pressure increased, volume decreased– The opposite can happen ( vol increase, pressure
decrease )
• This is what meant by INVERSELY proportional