Chemistry of Gases - Multiple Choice Questions Review

The kinetic-molecular theory explains the behavior of (A) gases only (B) solids and liquids (C) liquids and gases (D)solids, liquids and gases

D

According to the kinetic-molecular theory, particles of matterare in constant motion (A) have different shapes (B) have different colors (C) are always fluid

A

An ideal gas differs from a real gas in that the molecules of an ideal gas _______. ** A) have no attraction for one another B) have appreciable molecular volumes C) have a molecular weight of zero D) have no kinetic energy E) have an average molecular mass

A

. At 333 K, which of the pairs of gases below would have the most nearly identical rates of effusion? A) N2O and NO2 B) CO and N2 C) N2 and O2 D) CO and CO2 E) NO2 and N2O4

B

Of the following gases, ___ will have the greatest rate of effusion at a given temperature. A) NH3 B) CH4 C) Ar D) HBr E) HCl

B

Gases tend to have very low densities because (A) a small number of gas particles occupy a large volume (B) a large number of gas particles occupy a small volume (C) a small number of gas particles occupy a small volume (D)they are lighter than liquids and solids

A

A real gas will behave most like an ideal gas under conditions of __________. * A) high temperature and high pressure B) high temperature and low pressure C) low temperature and high pressure D) low temperature and low pressure E) STP

B

Which of the following gases would have the highest average molecular speed at 25°C? A) O2 B) N2 C) CO2 D) CH4 E) SF6

D

Which noble gas is expected to show the largest deviations from the ideal gas behavior? * A) helium B) neon C) argon D) krypton E) xenon

E

Which of these changes would NOT cause an increase in the pressure of a gaseous system? (A) The container is made larger. (B) Additional amounts of the same gas are added to the container. (C) The temperature is increased. (D)Another gas is added to the container.

B

When gas molecules collide, kinetic molecular theory predicts (A) the collisions are inelastic and there is less kinetic energy after the collision (B) the collisions are perfectly elastic and there is an more kinetic energy after the collision. (C) the collisions are so hard the gas molecules break apart. (D)the collisions are perfectly elastic and there is no net loss of kinetic energy.

D

The Van der Waals equation for real gases recognizes that __________. ** A) gas particles have non-zero volumes and interact with each other B) molar volumes of gases of different types are different C) the non-zero volumes of gas particles effectively decrease the amount of "empty space" between them D) the molecular attractions between particles of gas decreases the pressure exerted by the gas E) All of the above statements are true.

E

The kinetic-molecular theory predicts that pressure rises as the temperature of a gas increases because __________. A) the average kinetic energy of the gas molecules decreases B) the gas molecules collide more frequently with the wall C) the gas molecules collide less frequently with the wall D) the gas molecules collide more energetically with the wall E) the gas molecules collide more frequently and more energetically with the wall

E

Which of the following statements about gases is false? * A) Gases are highly compressible. B) Distances between molecules of gas are very large compared to bond distances within molecules. C) Non-reacting gas mixtures are homogeneous. D) Gases expand spontaneously to fill the container they are placed in. E) All gases are colorless and odorless at room temperature.

E

Arrange the following gases in order of increasing average molecular speed at 25°C. Cl2, O2, F2, N2 A) Cl2< F2< O2< N2 B) Cl2< O2< F2< N2 C) N2< F2< Cl2< O2 D) Cl2< F2< N2< O2 E) F2< O2< N2< Cl2

A

The greater the mass or velocity of a particle, the ________ the kinetic energy. (A) greater (B) lesser (C) same as (D)Impossible to determine

A

Which of the following is not part of the kinetic-molecular theory? A) Atoms are neither created nor destroyed by ordinary chemical reactions. B) Attractive and repulsive forces between gas molecules are negligible. C) Gases consist of molecules in continuous, random motion. D) Collisions between gas molecules do not result in the loss of energy. E) The volume occupied by all of the gas molecules in a container is negligible compared to the volume of the container.

A

Which one of the following gases would deviate the least from ideal gas behavior? * A) Ne B) CH3Cl C) Kr D) CO2 E) F2

A

According to kinetic-molecular theory, if the temperature of a gas is raised from 100°C to 200°C, the average kinetic energy of the gas will __________. A) double B) increasebyafactorof1.27 C) increase by a factor of 100 D) decrease by half E) decreasebyafactorof100

B

As the temperature of the gas in a balloon decreases ___ A) the volume increase. B)the average kinetic energy of the gas decreases C) the pressure increases D) All of the above

B

At high temperatures the particles of a gas (A) move slower and hit the walls of their container less often. (B) move faster and hit the walls of their container more frequently (C) move faster and hit the walls of their container less frequently (D)don't move at all and don't hit the walls of their container.

B

If the temperature is lowered from 60°C to 30°C, the volume of a fixed amount of gas will be one half the original volume assuming the pressure is kept constant. A) True B) False

B

Of the following, only __________ is impossible for a gas. A) V1/T1 = V2/T2 B) V1T1=V2T2 C) V1/V2 = T1/T2 D) V2 = (T2/T1)V1 E) V1/V2 = T1/T2 = 0

B

One significant difference between gases and liquids is that _________ * A) a gas is made up of molecules B) a gas assumes the volume of its container C) a gas may consist of both elements and compounds D) gases are always mixtures E) All of the above answers are correct.

B

One significant difference between gases and liquids is that __________. A) a gas is made up of molecules B) a gas assumes the volume of its container C) a gas may consist of both elements and compounds D) gases are always mixtures E) All of the above answers are correct.

B

What happens to the volume of a gas during compression? (A) The volume increases (B) The volume decreases (C) The volume remains constant (D)It is impossible to tell because all gases are different

B

Which statement about atmospheric pressure is false? * A) As air becomes thinner, its density decreases. B) Air actually has weight. C) With an increase in altitude, atmospheric pressure increases as well. D) The colder the air, the lower the atmospheric pressure. E) Atmospheric pressure prevents water in lakes, rivers, and oceans from boiling away.

B

According to the kinetic-molecular theory, particles of a gas (A) attract each other but do not collide (B) repel each other and collide (C) neither attract nor repel each other but collide (D)neither attract nor repel each other and do not collide

C

According to the kinetic-molecular theory, which substances are made of particles? (A) Ideal gases only (B) All gases (C) All matter (D)All matter except solids

C

Arrange the following gases in order of increasing average molecular speed at 25°C: He, O2, CO2, N2 A) He<N2 <O2 <CO2 B) He<O2 <N2 <CO2 C) CO2 < O2 < N2 < He D) CO2 <N2 <O2 < He E) CO2 < He < N2 < O2

C

Gases are characterized by (A) strong intermolecular interactions. (B) Intermolecular interactions that are stronger than those found in solids. (C) no intermolecular interactions present particles. (D)weak intermolecular interactions.

D