quiz 4 Flashcards
What does it mean when collisions are elastic
they dont lose kinetic energy
What can change the pressure of a gas
area
What can charge the force of a gas
adding gas
how can you compress a gas sample
use a piston to decrease volume
what is kinetic molecular theory
- gas molecules are tiny and afr apart from each other
- constantly moving in random directions
- collision are elastic
- no intermolecular forces
- KE (half infinity) T
what happens when volume decreases
of collisions/time increases
force increases
Area decreases
pressure increases
formula relating pressure and volume
P1V1=P2V2
P(alpha)1/V
what happens when you blow into a balloon?
n increases collisions increase pressure increases volume increases to keep pressure constant pressure inside= pressure outside
formula relating volume and moles (n)
V1/N1=V2/N2
what happens if you heat a balloon?
temperature increases velocity increases collisions increase pressure increases in balloon volume increases to keep pressure constant
what is the relationship with temperature and volume
directly proportional
what is a formula relating temperature and volume
T1/V1=T2/V2
If you want the pressure of a sample of gas to go down, what could you do?
increase volume
decrease temperature
decrease moles (n)
what are the important relationships (parameters) for a gas?
V(alpha)1/P
V(alpha)n
V(alpha)T
how to convert Celsius to K
add 273.15
density formula
d=m/v
g/mL
Molarity formula
MM=m/n
MM=dRT/P
partial pressure formula for a mixture of gases
Ptotal= Pa+Pb+Pc+…
P=nRT/V
=(na+nb+nc)(RT/V)
What formula do you use to find the partial pressure of each gas
Pgas=Xgas(Ptotal)
X=moles/mole percent divide by 100
how to find mole fraction
na/ntotal=xa
a=specific gas
what is diffusion
moving from higher concentration to lower “spreading out” of molecules
What does diffusion depend on
Temperature and molar mass
What happens when temperature increases in a diffusion
molecules travel faster
what happens when molar mass increases in a diffusion
diffusion rate decreases
What is effusion
“leaking through a hole”
What does effusion depend on?
Temperature, molar mass
What happens when you increase temperature in an effusion
effusion rate increases
What happens when you increase molar mass in an effusion
effusion rate decreases
what gases leave balloons first, vice versa
smaller gas particles escape first, larger last
helium would be first
