Which of the following is TRUE about most gases?
Their particles are very close together.
All of their particles are the same size.
They have a fixed volume.
They expand to completely fill their container.
In the van der Waals equation, what does a represent?
The volume of the gas molecules
The number of gas particles in moles
The attraction between the gas molecules
The ambient temperature
What does b represent in the van der Waals equation?
The volume of the container
The volume of the gas overall
The volume of the gas molecules
The volume of the container not filled by the gas
Why can't all of the gas particles in a container have very high or very low speeds?
Because there is not enough pressure inside
Because as particles collide, a gain in kinetic energy other
Because as particles collide they both increase their energy
Because there is not enough pressure inside of a closed cont
In the ideal gas equation, what does R represent?
Number of moles
Pressure
The ideal gas constant
Temperature
If someone is measuring pressure, they might use any of the following units EXCEPT _____.
Millimeters of mercury
Torr
Atmospheres
Pounds
A sample of hydrogen has a volume of 25 L under a pressure of 5 atm. What will the pressure of this gas be if the volume were decreased to 5 L?
25 atm
5 atm
15 atm
10 atm
What does the Maxwell-Boltzmann curve tell us?
The probability of a particle's direction
The probability of a particle's curve
The probability of a particle's speed
he probability of massive particles
If a 22.4 L container is holding 1.00 mole of a gas at 273 kelvins, then what is its pressure?
1.00 atm
22.4 atm
22.2 atm
2.00 atm
1000 mL of a gas at 15 atm is compressed to 500 mL. What is its new pressure?
2 atm
3 atm
5 atm
30 atm
Temperature is a measure of:
The amount of heat a substance has.
The average potential energy of the particles in a substance
The number of particles a substance has.
The average kinetic energy of the particles in a substance.
Which Celsius temperature is equal to 310 K?
285 degrees Celsius
583 degrees Celsius
37 degrees Celsius
310 degrees Celsius
A container has a volume of 53.9 L. Assuming it is at STP, how many moles of gas particles does it contain?
1,200 mol
0.416 mol
2.41 mol
76.3 mol
What is mass?
the volume of an object
the amount of matter in an object
none of these are correct
the weight of an object
Under non-ideal conditions, why was the pressure lower using the van der Waals equation?
The attraction between the molecules increases.
The attractive forces between the molecules makes em smaller
The attractive forces between the molecules makes em larger
The pressure was greater.
If you know the temperature, volume, and pressure of a gas, how would you rearrange the ideal gas equation to find the number of moles?
Divide PV by T only.
Divide PV by n.
Multiply PV by both T and R.
Divide PV by both T and R.
A balloon has an initial volume of 150 mL at 25 degrees Celsius. If the temperature is increased to 75 degrees Celsius, what is the final volume?
50 mL
175 mL
450 mL
150 mL
What is the name of the sum of atomic masses (for molecular compounds) in a chemical formula?
molecular mass
formulaic mass
total mass
atomic mass
Avogadro's law shows the relationship between _____.
temperature and pressure
volume and number of particles
temperature and number of particles
pressure and number of particles
Assuming the volume is held constant, what happens to the pressure of a gas when the absolute temperature doubles?
It remains unchanged.
It is halved.
It is doubled.
It is quadrupled.
Why would a scientist have difficulty observing the behavior of an ideal gas?
Because an ideal gas cannot be compressed.
Because all ideal gases are invisible.
Because an ideal gas is theoretical, and hence not real.
Because an ideal gas is made of molecules that cant be seen
Assuming pressure and temperature are held constant, then what happens to the volume of a non-rigid container when the number of molecules in the container is doubled?
The volume stays the same.
It decreases to half its original volume.
There is not enough information given to determine this.
The volume doubles.