Question : 81.              Which of the following statements related to kinetic-molecular theory : 1335486

81.              Which of the following statements related to kinetic-molecular theory of gases is correct for an ideal gas?

A)Gases are composed of small particles with a small amount of space between them.

B)Gas particles move in a zigzag pattern until they collide with something.

C)When gas particles collide, they lose some of their kinetic energy, and will slow down over time.

D)In a mixture of gases, attractive forces between particles cause the measured pressure to be lower than that expected for a pure gas.

E)The pressure of a gas arises from the sum of the collisions of the particles with the walls of the container.

82.              Which of the following statements related to kinetic-molecular theory of gases is correct for an ideal gas?

A)There are no attractive or repulsive forces between and among gas particles.

B)Gas particles move slowly in a chaotic pattern until they collide with something.

C)For a given amount of gas, the smaller the volume of the container, the fewer the collisions that occur with the container walls, since there is less surface area.

D)The density of a gas is somewhat lower than that of a liquid.

E)The more gas particles there are in a container, the more frequently they collide with one another, so the particles stick together, resulting in a lower pressure.

83.              Which of the following statements related to kinetic-molecular theory of gases is correct for an ideal gas?

A)There is a very small range of measured velocities for the particles in a given gas sample.

B)When the temperature of a gas sample increases, the velocity of some of the particles increases, while others slow down, so that the average velocity stays the same.

C)Larger particles move faster than smaller gas particles because they have more momentum.

D)The average kinetic energy of gas particles depends only on the absolute temperature.

E)Larger gas particles strike the walls of the container harder, so a given amount of argon in a container will have a higher pressure than the same amount of helium under similar conditions.

84.              It can be observed experimentally that the volume of a gas will be decreased by applying pressure.  This observation is best explained by the assumption that

A)the average kinetic energy of gas molecules is directly proportional to the absolute temperature.

B)gas molecules collide without loss of kinetic energy.

C)gas molecules are small compared to the distance between them.

D)gas molecules exert almost no attractive forces on one another.

E)gas molecules become smaller.

85.              A weather balloon filled with helium gas gets larger as it ascends to high altitudes.  The expansion of the balloon is primarily due to

A)a decrease in the average kinetic energy of the helium atoms inside the balloon.

B)an increase in the average kinetic energy of the helium atoms inside the balloon.

C)a decrease in the average kinetic energy of the air molecules outside the balloon.

D)an increase in the rate of collision of the helium atoms against the inside walls of the balloon.

E)a decrease in the rate of collision of the air molecules on the outside walls of the balloon.

86.              According to kinetic-molecular theory, molecules of different gases at the same temperature always have the same

A)molar mass.D)volume.

B)pressure.E)number of moles.

C)average kinetic energy.

87.              Under which conditions does sulfur trioxide (SO3) have the greatest molar volume?

A)high temperature and low pressure

B)low temperature and high pressure

C)high temperature and high pressure

D)low temperature and low pressure

E)The molar volume is always 22.414 L.

88.              Rank the following substances in order of increasing average velocity, assuming they are all at the same temperature:  O2, CO2, Ar, He

A)O2 < CO2 < Ar < HeD)CO2 < O2 < Ar < He B)CO2 < Ar < O2 < HeE)He < O2 < Ar < CO2 C)Ar < O2 < CO2 < He   89.              Rank the following substances in order of increasing average velocity, assuming they are all at the same temperature:  N2, CH4, Ne, Kr A)N2 < CH4 < Ne < KrD)Ne < CH4 < N2 < Kr B)CH4 < Ne < N2 < KrE)Ne < Kr < N2 < CH4 C)Kr < N2 < Ne < CH4   90.              Rank the following substances in order of increasing average kinetic energy, assuming they are all at the same temperature:  N2, CH4, Ne, Kr A)N2 < CH4 < Ne < KrD)Ne < CH4 < N2 < Kr B)CH4 < Ne < N2 < KrE)none of these choices is correct C)Kr < N2 < CH4 < Ne