03/3 Flashcards
according to the kinetic theory of gases, the kinetic energy is proportional to what?
it is proportional to the pressure
the kinetic energy of a gas molecule depends on what?
only the temperature
for two different chemical species, the kinetic energy of their individual gas molecules will be ______ at 25 C
the same
according to maxwells distribution of speed, what does the number of molecules moving at a certain speed S depend on
it depends on the temperature and molecular weight
if we increase the temperature, what happens to the number of molecules moving at high speeds
it increases
at higher temperatures what happens to the distribution of speeds
it increases
at a lower molecular weight, how many molecules are moving fast?
there are generally more than at higher molecular weights
lighter things move faster
at a lower molecular weight, what happens to the dsitribution of speed
there is a wider distribution of speed for molecules with lower molecular weight
what are the four variables that affect collision frequency
Vrms (which is related to temperature)
Volume (small vol = more collisions)
# of molecules (more molecules =more collisions)
Size of molecules (collision cross section)
what is the mean free path
the distance between collisions, how far the molecule can travel before colliding
what happens to the mean free path if we increase the pressure
the collision frequency will increase so the mean free path will decrease
what happens to the mean free path if we increase the collision cross section
the collision frequency will increase so the mean free path will decrease
what happens to the mean free path if we increase the molecular weight
the Vrms speed will decrease so the mean free path will decrease
