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Open-Notes QUIZ TODAY Over: Pressure, Fluids, Gas Laws.

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Presentation on theme: "Open-Notes QUIZ TODAY Over: Pressure, Fluids, Gas Laws."— Presentation transcript:

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 Temperature When we deal with temperature in these gas laws, absolute temperature is used – Kelvin scale – Through examples, you will see why we have the Kelvin scale

7 Bellwork – 02/05/15 With constant temperature, do you think pressure and volume are directly or inversely proportional? inversely – We will use a simulation

8 Boyle’s Law Product of pressure and volume is constant – Temperature is held constant Pressure and Volume are INVERSELY Proportional P 1 V 1 = P 2 V 2 = CONSTANT “1” indicates initial conditions or a “before” “2” indicates final conditions or an “after”

9 Gay-Lussac’s Law

10 Charles’s Law

11 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)

12 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? P 1 V 1 = P 2 V 2 = CONSTANT

13 Example of Boyle’s Law P 1 V 1 = P 2 V 2 = CONSTANT ( 478 ) * ( 325 ) = 155350 ( our constant ) 155350 = P 2 V 2 = P 2 * ( 416 ) P 2 = 155350 / 416 = 373 mmHg

14 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


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