Gases & Gas Laws ver1 +vreyna

What are the two assumptions made about gas particles for them to be considered ideal? That gas particles have

(check the two)

• no volume compared to the space they occupy

• no mass

• no attractive forces between the particles

• no kinetic energy at low temperatures

A gas will behave most like an ideal gas when the pressure is

• low and the temperature is low

• high and the temperature is low

• high and the temperature is high

• low and the temperature is high

The best definition of temperature is " A measure of.......

• how much heat something contains

• the average kinetic energy of a substance

• the average potential energy of a substance

• how hot or cold something is

Which of these gases will deviate the most from ideal gas behavior (i.e. which gas is least ideal) ?

• hydrogen, H₂

• oxygen, O₂

• carbon dioxide, CO₂

• helium, He

Which of these is NOT a unit for the pressure of a gas?

• Pa

• ^o K

• KPa

• mm Hg

• Torr

Which of these are aspects of the KMT (Kinetic-molecular theory) ? Check all that apply

• gas particles move in straight lines

• collisions between gas particles are elastic

• gas particles are inconstant, random motion

• gas particles have a crystalline structure

• gas particles have circular motion

Whenever a gas is collected by water displacement, the gas will always have some water vapor in it. If the total pressure of a gas with water vapor is 762.0 Torr and the vapor pressure of water is 31.8 Torr, what must be the pressure of just the gas?

• 730.2 Torr

• 793.8 Torr

• 31.8 Torr

• 762.0 Torr

A SCUBA diver's tank has these gases each at the given partial pressure: helium (22 atm), oxygen(40 atm) and nitrogen (85 atm). What percentage of the mixture is oxygen?

• 40 %

• 27 %

• 0.27

• 15 %

10.0 liters of a gas at a pressure of 200 KPa is allowed to expand to 40.0 liters. What is the new pressure?

• 800 KPa

• 40 KPa

• 100 KPa

• 50 KPa

Which sentence is consistent with the graph?

• heating a closed container could cause the pressure of the gas to increase

• Gases expand in volume when they are heated and contract when cooled

• cooling a container of a gas will cause the pressure inside to increase

• the pressure of a gas is inversely proportional to its Kelvin temperature