chem

Which of the following statements about gases is false?

All gases are colorless and odorless at room temperature.

One significant difference between gases and liquids is that __________. y

a gas assumes the volume of its container

Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature? y

LiCl

Gaseous mixtures __________. y

are all homogeneous

Which statement about atmospheric pressure is false? y

With an increase
in altitude, atmospheric pressure increases as well.

Isothermal" means __________. y

at constant temperature

The volume of an ideal gas is zero at __________. y

-273�C

Of the following, only __________ is impossible for an ideal gas. y

V1T1 = V2T2

The molar volume of a gas at STP is __________ L. y

22.4

Standard temperature and pressure (STP), in the context of gases, refers to __________. y

273.15K and 1atm

The average kinetic energy of the particles of a gas is directly proportional to __________. y

the square of the rms speed

The kinetic-molecular theory predicts that pressure rises as the temperature of a gas increases because __________. y

both the gas molecules collide more frequently with the wall and the gas molecules collide more energetically with the wall

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 __________. y

increase by a factor of 1.27

Which of the following is not part of the kinetic-molecular theory? y

Atoms are neither created nor destroyed by ordinary chemical reactions.

Of the following gases, __________ will have the greatest rate of effusion at a given temperature. y

CH4

At 333 K, which of the pairs of gases below would have the most nearly identical rates of effusion? y

CO and N2

Arrange the following gases in order of increasing average molecular speed at 25�C.
He, O2, CO2, N2 y

CO2<O2<N2<He

Which one of the following gases would have the highest average molecular speed at 25�C? y

CH4

An ideal gas differs from a real gas in that the molecules of an ideal gas __________. yy

have no attraction for one another

A real gas will behave most like an ideal gas under conditions of __________. y

high temperature and low pressure

Which one of the following gases would deviate the least from ideal gas behavior? y

Ne

Which noble gas is expected to show the largest deviations from the ideal gas behavior? y

xenon

When gases are treated as real, via use of the van der Waals equation, the actual volume occupied by gas molecules __________ the pressure exerted and the attractive forces between gas molecules __________ the pressure exerted, as ycompared to an ideal ga

increases, decreases

A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 11.8 cm. Atmospheric pressure was 783 mm Hg. The pressure of the argon in the container was __________ mm Hg. y

118 mm hg