quiz 4 Flashcards
(29 cards)
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
