Week 3 - Gas Laws Flashcards Preview

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Flashcards in Week 3 - Gas Laws Deck (23):
1

What is the Ideal Gas Law?

PV=nRT P= Pressure V= Volume n= moles R= constant T= Absolute Temp

2

2. How is the ideal gas law flawed in respect to “real” gases

Ideal gases don’t exist but as long as pressure isn’t too high and temperature isn’t too low, real gases approximate ideal behavior.

3

What is a mole of gas

At standard T and P the volume of a mole of an ideal gas is 22.71 L Avogadro’s number = 6.022 x 1023

4

 Name all the different  measurements given to measure atmospheric pressure    

760 mmHg (torr)
760mmHg
14.7psi

 

 

5

5

What is the relationship of pressure to volume

pressure and volume are inverses

6

What does Charles’ law state

The volume of a gas is proportional to its absolute temperature

V1/T1=V2/T2

7


 What does Boyle’s law state

 As pressure increases, volume decreases, and vice versa.

P1V1=P2V2

8


6. What does Guy Lussac’s law state

Pressure is directly proportional to absolute temp if volume is constant

P1/T1=P2/T2

9


Combined Law Works for all of them

P1V1T2=P2V2T1

10


Volume and pressure (Boyles Law)

(The lungs, inspiration and expiration. The diaphragm contracts thus decreasing intrathoracic pressure and increasing the volume of gas within the lungs.)

11


Volume and Temperature (Charles Law)

Fill a syringe with air to a volume of 10 ml when the temperature is 25 degrees Celsius, allowing the plunger with the freedom of movement. If that syringe was bathe in hot water whose temperature was 100 degree Celsius the volume of gas would expand pushing the plunger out  to a volume of 12.52 ml)

12

What is Avogadro’s number and what does it represent

Avogadro’s number is 6.023 X 1023.  This number is indicative of the quantity of molecules in a mole of a substance

13

What is standard temperature

0 Celsius

273 Kelvin

32 Fahrenheit

14

What is standard pressure

1 atm= 101.325 kPa = 760 torr(mmHg)

15


What is the standard volume

22.71 Liters 

16

What is Dalton’s Law

Dalton’s Law states that the total pressure of a system is the additive pressures of each individual gas in a mixture.

Multiple gases in a mixture each will exert a pressure in proportion to its percentage in the mixture

17


Apply Dalton’s law to air at sea level  

79% Nitrogen: 0.79 x 760mmHg (Atmospheric Pressure) =
600.4 mmHg partial pressure nitrogen

21% Oxygen: 0.21 x 760mmHg
156.6 mmHg partial pressure oxygen

 

 

18


What are Van der Waahl’s forces 

collectively describes forces interacting between molecules

19


What is the molecular basis of pressure

Force exerted by molecules as they constantly move and collide with the walls of their container

20

 What is the molecular basis of  temperature

the quantitative measurement of the kinetic energy in a given area

21

What is the molecular basis of volume

Volume of a substance is directly proportional to the kinetic energy of that substance. With more kinetic energy, molecules in a substance move faster and farther apart.  As molecules move farther apart. The attractive Van der Waal forces between them weaken and the substance may shift from a solid state to a liquid state

22

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