Ch 11 Section 4 Flashcards Preview

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Flashcards in Ch 11 Section 4 Deck (13):
1

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

container in which they are placed

2

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

diffusion

3

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

tiny opening in the container

4

rates of effusion and diffusion depend on the relative

velocities of gas molecules

5

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

molar mass

6

liter molecules move faster than heavier molecules at the same

temperature

7

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

1/2mv^2

8

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

1/2 MbVb&2

9

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

square root of Mb / square root of Ma

10

the above equation is a mathematical statement of some of

graham's discoveries

11

graham's equation describes the rates of

effusion

12

graham's equation can also be used to find the

molar mass of an unknown gas

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

square roots of their molar masses.