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27 Cards in this Set

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Consider four identical 1.0-L flasks containing the following gases each at 25°C and 1 atm pressure. For which gas do the molecules have the highest average velocity?

H2

Compare the ratio of effusion rates to the ratio of the diffusion rates for two gases with molecules of approximately the same mass and held under the same conditions.

The ratio of the effusion rates is equal to the ratio of the diffusion rates.

A sample of hydrogen gas was collected over water at 36 ?C and 855 mmHg. The volume of the container was 6.50 L. Calculate the number of moles of H2 collected. (Vapor pressure of water is 44.6 torr at 36 ?C)

0.27 mol

If the volume of a sample of gas is reduced at constant temperature, the average velocity _______, the average force of an individual collision _________, and the average number of collisions with the wall per second_______.

remains the same, remains the same, increases

Gases generally have

low density

The reason that some insects can walk on water is due to

surface tension

What is the simplest formula of a solid containing A, B, and C atoms in a cubic lattice in which the A atoms occupy the corners, the B atoms the body-center position, and the C atoms the faces of the unit cell?

ABC3

Which of the following best describes the bonding in metals?

(Electron sea)The valence electrons of a each metal atom are delocalized over all of the atoms in the piece of metal.

When liquid bromine is cooled to form a solid, which of the following types of solid would it form?

Molecular

Which of the following changes will NOT affect the total pressure of gas in a container, assuming all other factors remain constant?

Half of the molecules are replaced by an equal number of molecules of a gas with a different molecular weight.

Select the gas with the highest average kinetic energy per mole at 298 K.

All have the same average kinetic energy

An unknown gas Q effuses 1.89 times as fast under the same conditions as Xe gas. What is the molar mass (g/mol) of Q? Enter your answer with one decimal place.

36.8

A 3.0-L sample of helium was placed in a container fitted with a porous membrane. Half of the helium effused through the membrane in 24 hours. A 3.0-L sample of oxygen was placed in an identical container. How many hours will it take for half of the oxygen to effuse through the membrane?

68h

When its applied to a real gas, the ideal gas law tends to become inaccurate when

the pressure is raised and the temperature is lowered.

The van der Waals equation, nRT = [P + a(n/V)2] (V – nb), incorporates corrections to the ideal gas law in order to account for the properties of real gases. One of the corrections accounts for

the finite volume of molecules

In frozen methane, CH4, the molecules of methane are held in place by

London dispersion forces

Choose the answer which best describes what type of solid the compounds below form, in that order.NaOH HCl CaO Sn

ionic, molecular, ionic, metallic

Select the gas with the largest root-mean-square molecular speed at 25°C.

H2

In an effusion experiment it required 40 s for a certain number of moles of a gas of unknown molar mass to pass through a small orifice into a vacuum. Under the same conditions 16 s were required for the same number of moles of O2 to effuse. What is the molar mass of the unknown gas?

200

A compound composed of carbon, hydrogen, and chlorine effuses through a pinhole 0.411 times as fast as neon. What is the molar mass of the compound?

118.4

Deviations from the ideal gas law are less at

high temperatures and low pressures

What types of forces exist between molecules of CO2?

dispersion forces onl

Which of the following statements about liquids is true?

London dispersion forces arise from a distortion of the electron clouds within a molecule or atom.

Ice is a molecular solid.

true

Which of the compounds below is an example of a network solid?

SiO2

Which of the following is not an example of a network covalent solid?

Iron

Thermal decomposition of 5.0 metric tons of limestone to lime and carbon dioxide requires 9.0 x 106 kJ of heat. Convert this energy to

9.0 x 109 J