Ch15 ideal gases

Question 1

mole

Answer 1

1 mole of a substance contain 6.02x10^23 particles

Question 2

moles equations

Answer 2

number of moles = mass/molar mass
number of particles = Na x number of moles

Question 3

Assumption of the model of kinetic theory of gasses

Answer 3

• Large numbers of particles in random rapid motion.
• volume of individual particle is negligible compared to the volume of gas.
• all collisions are perfectly elastic, time spent in collisions in negligible compared to time spent between collisions.
• no forces exerted between particles unless in collisions

Question 4

Boyles law

Answer 4

P inversely proportional to volume at constant temperature for fixed amount of gas
P = constant / v

Question 5

Pressure - temperature law

Answer 5

P is proportional to T when V of gas is constant.
P = constant x T

Question 6

explaining pressure in terms of kinetic model

Answer 6

• particles collide with walls
  delta p = final p - initial p
  -mv - mv = -2mv
  F = change in p/t
  -2mv / t
• pressure = sum of all forces / area

Question 7

what is root mean squared speed?

Answer 7

equation used to work out the mean speed of particles

Question 8

How do you work out the mean squared speed?

Answer 8

• square the speed
• work out the mean
• root the mean