Open-Notes QUIZ TODAY

1
Open-Notes QUIZ TODAY

• Over Pressure, Fluids, Gas Laws

2
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? )

3
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

4
Gas Laws

• How did we define a LAW?

5
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

6
Boyles 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

7
Gay-Lussacs Law

•  

8
Charless Law
 

•  

9
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)

10
Example of Boyles 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

11
Example of Boyles Law

• P1V1 P2V2 CONSTANT
• ( 478 ) ( 325 ) 155350 ( our constant )
• 155350 P2V2 P2 ( 416 )
• P2 155350 / 416 373 mmHg

12
Using Boyles 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