1 - Gases Flashcards
What is pressure
Force per unit area
What is a gas
A gas has a low density, and consists of molecules. There is little interaction between the molecules and most of the volume is really empty space
In what unit is pressure measured
The pascal (Pa)
Draw a typical barometer and manometer and describe how they work
Check textbook
State Boyle’s Law
The absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remains unchanged within a closed system
P1 = P2
State Charles Law
For a given quantity of a gas at a certain pressure, the volume increases as the temperature increases
V1/T1 = V2/T2
State Avogadro’s Law
For a given mass of an ideal gas, the volume and the amount(moles) of the gas are directly proportional if the temperature and pressure are constant
V/n = k
What is the equation for the Ideal Gas Law
PV = nRT
What is the molar number
Volume relationship for gases at equal pressure and temperature
n(a) / n(b) = V(a) / V (b)
What is the difference between a real has and ideal gas
Real gases are the gases we encounter in nature, while ideal gases are hypothetical gases
Why do real gases not obey the ideal gas law
Due to the attraction between molecules and the volume of the molecules.
State Dalton’s Law of partial pressure
The total pressure of a mixture of gases that do not react will be the sum of the partial pressures of the component gases
P(total) = P(a) + P(b)
What is the partial pressure of a gas
The pressure a gas would exert if it was the only gas in the container
What is the equation for the root mean square velocity of a gas
u(rms) = square root of (3RT/M)
What is the equation for the temperature-molecular motion relationship
Ne = (3/2) nRT
