Week 3 - Gas Laws

Question 1

What is the Ideal Gas Law?

Answer 1

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

Question 2

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

Answer 2

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.

Question 3

What is a mole of gas

Answer 3

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

Question 4

Name all the different measurements given to measure atmospheric pressure

Answer 4

760 mmHg (torr)
760mmHg
14.7psi

Question 5

What is the relationship of pressure to volume

Answer 5

pressure and volume are inverses

Question 6

What does Charles’ law state

Answer 6

The volume of a gas is proportional to its absolute temperature

V1/T1=V2/T2

Question 7

What does Boyle’s law state

Answer 7

As pressure increases, volume decreases, and vice versa.

P₁V₁=P₂V₂

Question 8

6. What does Guy Lussac’s law state

Answer 8

Pressure is directly proportional to absolute temp if volume is constant

P₁/T₁=P₂/T₂

Question 9

Combined Law Works for all of them

Answer 9

P₁V₁T₂=P₂V₂T₁

Question 10

Volume and pressure (Boyles Law)

Answer 10

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

Question 11

Volume and Temperature (Charles Law)

Answer 11

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)

Question 12

What is Avogadro’s number and what does it represent

Answer 12

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

Question 13

What is standard temperature

Answer 13

0 Celsius

273 Kelvin

32 Fahrenheit

Question 14

What is standard pressure

Answer 14

1 atm= 101.325 kPa = 760 torr(mmHg)

Question 15

What is the standard volume

Answer 15

22.71 Liters

Question 16

What is Dalton’s Law

Answer 16

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

Question 17

Apply Dalton’s law to air at sea level

Answer 17

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

Question 18

What are Van der Waahl’s forces

Answer 18

collectively describes forces interacting between molecules

Question 19

What is the molecular basis of pressure

Answer 19

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

Question 20

What is the molecular basis of temperature

Answer 20

the quantitative measurement of the kinetic energy in a given area

Question 21

What is the molecular basis of volume

Answer 21

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

Question 22

Answer 22

Just Know It