Gases Flashcards
The following are observed characteristics of gases except for
a. gases can be compressed by application of pressure
b. gases diffuse and spontaneously mix with each other
c. pressure exerted by a gas decreases with increase in temperature
d. there is negligible attraction between particles of an ideal gas
c. pressure exerted by a gas decreases with increase in temperature
As altitude increases, air becomes less dense and
a. pressure increases
b. pressure decreases
c. pressure remains the same
d. none of the above
b. pressure decreases
Raising the temperature of an enclosed gas
a. slows down the kinetic energy of the gas molecules
b. decreases the momentum of the gas molecules
c. forces the gas particles to collide with the walls harder
d. decreases the volume of the gas
c. forces the gas particles to collide with the walls harder
At constant temperature and pressure, the rate of diffusion of a gas varies
a. inversely as its density
b. directly as its molecular mass
c. directly as the square root of its density
d. inversely as the square of its molecular mass
d. inversely as the square of its molecular mass
What are the standard temperature and pressure (STP) conditions for gas law problems?
a. 760 atm, 0 degC
b. 1 mm Hg, 273 degC
c. 760 mmHg, 273 K
d. 760 atm, 0 K
c. 760 mmHg, 273 K
If the temperature of a confined gas is doubled, while the volume is held constant, what will happen
to the pressure?
a. it will be doubled
b. it will be half as large
c. it will be four times as large
d. cannot be determined
a. it will be doubled
What happens to the volume of a fully inflated balloon when it is taken outside on a cold day?
a. its volume decreases
b. it remains the same
c. its volume increases
d. its volume becomes equal to zero
a. its volume decreases
The process by which a gas under pressure escapes from a compartment of a container to another by
passing through a small opening is called
a. effervescence
b. effusion
c. diffusion
d. sublimation
b. effusion
As a bubble of air rises from a diver’s helmet to the surface of the water, it continuously expands.
What law is illustrated?
a. Dalton’s law
b. Avogadro’slaw
c. Boyle’slaw
d. Charles’ law
c. Boyle’slaw
A gas is in a steel tank at 100 atm pressure. When the tank is opened to the atmosphere, the gas
suddenly expands, increasing its volume by 10%. This illustrates
a. Dalton’s law
b. Boyle’s law
c. Charles’ law
d. Gay-Lussac’s law
b. Boyle’s law
Water boils at a lower temperature such as on top of a mountain than at sea level. This illustrates
a. Boyle’slaw
b. Charles’ law
c. Graham’slaw
d. Avogadro’slaw
b. Charles’ law
What volume is occupied by 4.00 g of carbon dioxide, CO2 (44.0) gas at a pressure of0.976 atm and a temperature of 25.00C?
a. 0.191 L
b. 19.1 L
c. 2.28 L
d. 22.8 L
c. 2.28 L
Which of the following represents the largest gas pressure?
a. 1.0 atm
b. 1.0 Pa
c. 1.00 mm Hg
d. 1.0 KPa
a. 1.0 atm
Molecular oxygen is highly soluble in the blood because
a. the hemoglobin molecule can bind up to four oxygen molecules
b. the solubility of oxygen is increased by the higher temperature of the body
c. pressure is increased inside the body
d. pressure inside the body is different outside of it
a. the hemoglobin molecule can bind up to four oxygen molecules
A fatal condition known as “bends” occurs when a diver ascends too quickly to the surface of the
water. This is due to
a. nitrogen in the blood boiling off rapidly as its partial pressure decreases, forming bubbles
in the blood
b. lack of oxygen in water at depths of more than 15 meters
c. the solubility of oxygen gas is very much decreased at greater depths
d. the solubility of oxygen decreases in the blood as the diver ascends
a. nitrogen in the blood boiling off rapidly as its partial pressure decreases, forming bubbles
in the blood
