Ch 11 Section 4

Question 1

the constant motion of gas molecules causes them to spread out to fill any

Answer 1

container in which they are placed

Question 2

the gradual mixing of two or more gases dude to spontaneous, random motion is

Answer 2

diffusion

Question 3

effusion is process whereby molecules of a gas confined in a container randomly pass through a

Answer 3

tiny opening in the container

Question 4

rates of effusion and diffusion depend on the relative

Answer 4

velocities of gas molecules

Question 5

velocity of a gas varies inversely with the square root of its

Answer 5

molar mass

Question 6

liter molecules move faster than heavier molecules at the same

Answer 6

temperature

Question 7

average kinetic energy of the molecules in any gas depends only on temp and equals

Answer 7

1/2mv^2

Question 8

for two different gases, A and B, at the same temp, the following relationship is true:
1/2 MaVa^2 =

Answer 8

1/2 MbVb&2

Question 9

rate of effusion of A/ rate of effusion of B =

Answer 9

square root of Mb / square root of Ma

Question 10

the above equation is a mathematical statement of some of

Answer 10

graham’s discoveries

Question 11

graham’s equation describes the rates of

Answer 11

effusion

Question 12

graham’s equation can also be used to find the

Answer 12

molar mass of an unknown gas

Question 13

graham’s law of effusion states that the rates of effusion of gases at the same temperature and pressure are inversely proportional to the

Answer 13

square roots of their molar masses.