chp 5 gen chem DAT Flashcards
when working with temp we use ..
kelvins
formula for K
C + 273
volume units
1 cm^3 = 1 ml
pressure units
1 atm = 760 torr=760 mmhg
pressure formula
pressure = force/area
we measure gas using ..
Hg manometer
in a manometer if pressure of gas and atmosphere are equal to one …
then the Hg tube height will be the same
what is an ideal gas
-gas particles volume are insignificantly compared to the massive space between them
-gas particles experience 0 intermolecular force
- gas particles are always in continues random motion
-gas molecules collision with each other are elastic , therefore 0 loss or gain go kinetic energy
-the average kinetic energy of gas depends only on the systems temperature
-gas particles volume are insignificantly compared to the massive space between them
in low pressures
gas particles experience 0 intermolecular force
high temp and gases with weak intermolecular force
Boyles law
Boyle’s law is a gas law, stating that the pressure and volume of a gas have an inverse relationship. If volume increases, then pressure decreases and vice versa, when the temperature is held constant. Therefore, when the volume is halved, the pressure is doubled; and if the volume is doubled, the pressure is halved.
Charles law
as long as everything else remains constant , volume is directly proportional to temp
avogadros law
as long as everything remains constant volume is directly proportional to the umber of gas molecules
combined gas law
P1V1/n1T1
pressure , volume and temp and moles together.
P2V2/n2T2
ideal gas law
if we know all but one , the ideal gas lets us calc for the unknown ( P,V,n,T)
ideal gas constant
r=0.0821 LX atm/MolXk
units for ideal gas
L X atm / Mol X K
STP = standard temperature and pressure
0 C (273 K ) and 1 atm ( 760 torr or mmhg
gas density
density is how heavy a certain amount of sub is
formula for gas density
D = mass / volume
another formula for gas density
D = P X molas mass / R X T
daltons law
the total pressure inside a container with gas is equal to the sum of all those individual gases
P total =
Pa + Pb +Pc …
grahams law
gases with los molecular weight escape quickly , gas with heavier molecular weight escape slowly
kinetic energy formula
1/2 mass X velocity ^ 2
grahams law formula
effusion rate gas 1 / effusion rate gas 2
(square root ) molec weight 2 / molec weight 1
