Chemistry
The volume of a gas is 5.0L when the temperature is 5.0C. If the temperature is increased to 10.0C without changing the pressure, what is the new volume?
5.1L
A pressure of 745 mm Hg equals
745 torr.
The principle that under similar pressures and temperatures, equal volumes of gases contain the same number of molecules is attributed to
Avogadro
Two gasses have the same temperature but different pressures. The kinetic-molecular theory does not predict that
Both gasses have the same densities.
Who developed the concept that the total pressure of a mixture of gasses is the sum of their partial pressures?
Dalton
What is the process by which molecules of a gas randomly encounter and pass through a small opening in a container?
Effusion
If V, P, and T represent the original volume, pressure, and temperature in the correct units, and V', P', and T' represent the new conditions, what is the combined gas law?
PV/T=P'V'/T
Why does the air pressure inside the tires of a car increase when the car is driven
The air particles inside the tire increase their speed because their temperature rises.
If the temperature of a container of gas remains constant, how could the pressure of the gas increase?
The number of gas molecules in the container increases.
Why could the pressure of a sample of gas at a constant volume fall 75 mm Hg?
The temperature decreased.
Why does a can collapse when a vacuum pump removes air from the can?
The unbalanced outside force from atmospheric pressure crushes the can.
If the temperature remains constant, V and P represent the original volume and pressure, and V' and P' represent the new volume and pressure, what is the mathematical expression for Boyle's law?
VP=V'P'
Supposed that two gases with unequal molar masses were injected into opposite ends of a long tube at the same time and allowed to diffuse toward the center, They should begin to mix
closer to the end that held the heavier gas.
According to Avogadro's law, 1L of H2(g) and 1 L of o2(g) at the same temperature and pressure
contain equal numbers of molecules
If a gas with an odor is released in a room, it can quickly be detected across the room because it
diffuses
Volumes of gaseous reactants and products in a chemical reaction can be expressed as ratios of small whole numbers
if constant temperature and pressure are maintained.
If force is held constant as surface area decreases, pressure
increases
If the temperature of a fixed quantity of gas decreases and the pressure remains unchanged,
its volume decreases.
Which instrument measures the pressure of an enclosed gas?
manometer
The law of combining volumes applies only to gas volumes
measured at constant temperature and pressure.
Knowing the mass and volume of a gas at STP allows one to calculate the
molar mass of the gas
According to Graham's law,two gasses at the same temp. and pressure will have different rates of effusion because they have different
molar masses
What is the SI unit of force?
newton
At STP the standard molar volume of a gas of known volume can be used to calculate the
number of moles of gas
If the temperature of a fixed quantity and volume of gas changes, what also changes?
pressure
What does the constant bombardment of gas molecules against the inside walls of a container produce?
pressure
To correct for the partial pressure of water vapor in a gas collection bottle, the vapor pressure of H2O at the collecting temperature is generally
subtracted from the atmospheric pressure.
Pressure is the force per unit
surface area
What determines the average kinetic energy of the molecules of any gas?
temperature
If the height of mercury in a barometer at 0 C is less than 760 mm Hg, then C
the atmospheric pressure is less than standard atmospheric pressure.
The gas pressure inside a container decreases when
the number of gas molecules is decreased.
If gas A has a molar mass greater than that of gas B and samples of each gas at identical temperatures and pressures contain equal numbers of molecules, then
the volumes of gas A and gas B are equal
