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Chemistry Chpt 9
Terms in this set (25)
What is the theory that explains the behavior of gases at the molecular level that is based on assumptions about Theoretical gas?
theoretical gas often referred to as an
Using the kinetic theory, why is a helium filled balloon expands when it is brought inside to a warm room from the cold outdoors?
Increasing the temperature of a gas means that the particles have more kinetic energy. Consequently, the collisions of the gas molecules with the walls of the container occur more often and are more forceful, so the gas pressure would increase. Because it is assumed that the pressure inside the warm room and outside is the same, the volume must increase to reduce the pressure to its original value.
What is Ideal gas?
imaginary, and its behavior conforms exactly to the assumptions of the kinetic theory
Gases deviate most from ideal behavior under conditions of very __________temperature and very __________ pressure
What is pressure defined as?
Force per unit area.
The earth's atmosphere has weight, which creates ___________ ______________
Standard temperature has been established as
0 degrees C or 273 Kelvin
Standard pressure has been established as
1 atm, 760 torr, 760 mm Hg, or 101.3 kPa
The abbreviation for standard temperature and
What is used to measure atmospheric pressure?
What is used to measure gas pressure?
When atmospheric pressure increases, how does the height of the column of mercury change?
If pressure is constant, does the volume of a sample of gas increases or decreases as temperature increases?
At constant pressure, the volume of a sample of gas is ___________ proportional to temperature as measured on the_______________ temperature scale
According to _______________ law, pressure and volume are
_______________ proportional provided all other factors remain constant. Mathematically, this means that their _______________ is a constant
Boyle's; inversely; product
What Gas Law permits calculation of any one term when temperature, pressure, and volume change for a gas?
If A and B are directly proportional and the value of A becomes 1/3 as much, what happens to the value of B?
B becomes 1/3 as much
What is Avogadro's Law?
equal volumes of different gases, at the same
temperature and pressure, contain the same number of molecules
At STP, 22.4 L of N2 contain how many molecules?
6.02 x 10^23
Tire manufacturers recommend checking air pressure when tires are cold, before driving. WHY?
As you drive, the temperature of the air inside the tire increases, increasing the pressure since the volume remains constant
Ammonia (NH3) and sulfur dioxide (SO2) are both gases with readily distinguishable odors. If a cylinder of each were opened at the same time in a
draftless room, which odor would you expect to smell first? EXPLAIN
Because both gases are at the same temperature, they each possess the same average kinetic energy. Since K.E. = 1⁄2 mv
2, the more massive gas will have the smaller velocity. The molar mass of ammonia is
17.0g and the molar mass of sulfur dioxide is 64.0g. Therefore, the ammonia will be smelled first since itis the less massive of the two gases
What does Dalton's law of Partial Pressure state?
In a mixture of gases, the total pressure of the mixture is equal to the sum of the pressures that each gas would exert by itself in the same volume.
Suppose you have 1 L of oxygen gas at a pressure of 1 atm, 1 L of nitrogen gas at a pressure of 2 atm, and 1 L of hydrogen gas at a pressure of 3 atm. All 3
samples are at room temperature. If you transfer the oxygen and nitrogen to the container occupied by the hydrogen, the pressure exerted by the oxygen in
the final mixture will be _______________. The pressure exerted by the mixture will be _______________ .
1 atm, 6 atm
At STP, ___________ liters is the volume one mole of a gas occupies; this quantity is consequently called the __________ volume of a gas
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