Module 5 Ideal gases Flashcards
State Boyle’s law
For a fixed mass at constant temperature, pressure is inversely proportional to volume
What can be used to measure pressure?
a Bourdon Gauge
What does PSI stand for?
pounds per square inch
What does a graph of P against V look like
curves
an asymptote
When taking measurements of pressure by changing volume, what is something that can be done to ensure more accurate results?
Change volume slowly so temperature doesn’t change drastically
What are the units for PV?
joules
State the pressure law?
for a fixed mass at constant volume, pressure is directly proportional to absolute temperature
State Charles’ law?
for a fixed mass at constant pressure, volume is directly proportional to absolute temperature
What is a simple combination of the gas laws which can be used when temperature, volume, and pressure are changing?
PV/T=constant
What is the symbol used to represent Avogadro’s constant?
Na (big N subscript capital A)
What is the symbol used to represent mass of one mole?
M (big M)
Molar mass
What is the symbol used to represent number of atoms?
N (big N)
Derive an equation involving density from the ideal gas equation?
PV=nRT
density p=m/V
V=m/p
Pm/p=nRT
total mass of gas m=nM
PnM/p=nRT (n cancels out)
P=pRT/M
What is absolute zero of a gas?
minimum possible temperature (-273 deg celcius or 0 Kelvin)
Pressure and volume tend to zero as internal energy tends to zero
How to convert from degrees celsius to Kelvin?
eg 20 degrees C
T in Kelvin = 20+273 =293K
How do you determine the value of absolute zero experimentally (graph)?
Vary the temperature of a gas using a water bath, record the corresponding pressure
