Gas laws
What are the three main variables describing gases?
Pressure, volume, and temperature.
What is 25C to Kelvin?
298K
Ideal gases are made of particles that do not experience this type of force. What is it?
Intermolecular force.
if P=100Pa, V=2dm, n=0.08mol, and R=8.31 find T in Kelvin.
T=PV/nR=(100*2)/(0.08*8.31)=300.8K
Boyle's Law shows the relationship between pressure and volume when ___ variable is constant. What is the constant variable?
Temperature.
What is the SI unit for pressure when used in the Ideal gas law?
Pascal(Pa)
Real gases behave most like ideal gases under what conditions?
High temperature and low pressure.
If temperature doubles and pressure stays the same, what happens to volume?
Volume doubles(Charles law)
What law states that equal volumes of all gases, at the same temperature and pressure, have the same number of molecules?
Avogadro's law
Charles Law shows that volume and temperature are directly proportional if this variable is constant. What is the variable?
What is the value of the gas constant R?
8.31 K-1mol-1
Why do real gases deviate from ideal behaviour at low temperatures?
If temperature is constant what happens to the volume, when you double the pressure?
The volume is cut in half (Boyle's law)
What is the molar volume of an ideal gas at STP?
22.4
The name of the law that combines Boyle's, Charles, and Dabuji?
Combined gas law.
What is the formula for Ideal gas law?
PV=nRT
Why do real gases deviate from ideal behaviour under low temperature and high pressure?
Because particles are close together, intermolecular forces and volume become significant.
How manny moles of gas are there in a 10L container at 300K, R=8.31 and 200kPa?
n=PV/RT=(200*10)/(8.31*300)=0.80 mol
What device is used to measure gas pressure?
Manometer or barometer
What is the name of the law that shows pressure, volume, temperature, and number of moles in one equation?
Ideal gas law.
Rearrange PV=nRT to solve for mol
n=PV/RT
What is the name of the equation that describes the behaviour of real gases which have finite volume and intermolecular forces between them.
Van der Waals equation
What is the symbol for the element hydrogen?
H
Explain why a helium balloon shrinks when in a freezer?
When put in a freezer the temperature decreases which makes the gas molecules move less, leading to pressure and volume decreasing.