collision and diffusion Flashcards
if you increase the pressure, what happens to the frequency between collisions
Z is proportional to temperature so it will increase
if the pressure is increased, what will happen to the mean free path?
sincee Z increases and the mean free path is related to 1/Z, then the mean free path will decrease. This makes sense because there will be less distance between the collisions
What would happen to the collisional frequency if we used a heavier isotope of an atom
if we increased the mass, the VRMS would be lower. Since Z is proportional to VRMS and the molecules are moving slower, the collisional frequency will decrease
if the mass is kept the same, but the cross sectional area is increased, what will happen to the collisional frequency
the frequency is proportional to the cross sectional area and collisions will occur more often so Z will increase while the mean free path decreases
whats the primary difference between liquid and gas phases
in gas phases, the molecules are further apart and do not collide as much
in liquid phases, the molecules are closer together and collide more
what is diffusion
the movement of molecules in solution
diffusion flows from
high to low
diffusion occurs
spontaneously
diffusion flows with
the concentration gradient
what is the flux
it is the number of moles that travel through a cross-section in a given amount of time
it is also known as the rate of diffusion
if the number of moles flowing through the cross sectional area is large, the flux will be?
higher which means it is a faster rate
what does ficks first law state
it states that the flux is proportional to the concentration gradient
if there is a larger difference between concentrations in a conc. gradient, how is the flux impacted
it is increased
