Week 3 - Gas Laws Flashcards Preview

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

What is the Ideal Gas Law?

A

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

2
Q

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

A

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
Q

What is a mole of gas

A

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
Q

 Name all the different  measurements given to measure atmospheric pressure    

A

760 mmHg (torr)
760mmHg
14.7psi

 

 

5
Q
A
5
Q

What is the relationship of pressure to volume

A

pressure and volume are inverses

6
Q

What does Charles’ law state

A

The volume of a gas is proportional to its absolute temperature

V1/T1=V2/T2

7
Q


 What does Boyle’s law state

A

 As pressure increases, volume decreases, and vice versa.

P1V1=P2V2

8
Q


6. What does Guy Lussac’s law state

A

Pressure is directly proportional to absolute temp if volume is constant

P1/T1=P2/T2

9
Q


Combined Law Works for all of them

A

P1V1T2=P2V2T1

10
Q


Volume and pressure (Boyles Law)

A

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

11
Q


Volume and Temperature (Charles Law)

A

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
Q

What is Avogadro’s number and what does it represent

A

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

13
Q

What is standard temperature

A

0 Celsius

273 Kelvin

32 Fahrenheit

14
Q

What is standard pressure

A

1 atm= 101.325 kPa = 760 torr(mmHg)

15
Q


What is the standard volume

A

22.71 Liters 

16
Q

What is Dalton’s Law

A

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
Q


Apply Dalton’s law to air at sea level  

A

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
Q


What are Van der Waahl’s forces 

A

collectively describes forces interacting between molecules

19
Q


What is the molecular basis of pressure

A

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

20
Q

 What is the molecular basis of  temperature

A

the quantitative measurement of the kinetic energy in a given area

21
Q

What is the molecular basis of volume

A

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
Q
A

Just Know It