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Flashcards in Chapter 5 Deck (44):
1

Gas volume changes with

pressure and volume

2

pressure =

force/area

3

atmospheric pressure decreases with

altitude

4

the 4 variables that determine behavior of gasses

pressure, temperature,volume,amount

5

ideal gas

gas that has linear relationships among the 4 variables

6

are there true ideal gases?

no

7

what is Boyles law?
(not the formula)

at a constant temperature, the volume is inversely proportional to the pressure

8

what is the formula for Boyles law?

PV= constant (p1t1=p2v2)

9

at fixed pressure and temperature, P decreases as V

increases

10

at a fixed temp. and pressure, P increases as V

decreases

11

What relationship does Boyles law illustrate with gases?

pressure & volume

12

What relationship does Charles law illustrate with gases?

temperature and volume

13

Absolute zero is what?

where an ideal gas would have 0 volume

14

what is the degree for absolute 0?

0 Kelvin

15

What is the proportional part of gases in Charles law?

temperature and volume

16

Volume decreases as temperature

increases

17

volume increases as temperature

decreases

18

what is a unit for force

newton

19

what is a unit for area

meters^2

20

what is the formula for charles law?

v/t = constant (v1t1 = v2t2)

21

what is a unit for pressure

pascal

22

What is the combined gas law?

P1V1/T1 = P2V2/T2

23

what is STP

standard temperature & pressure

24

What is standard molar volume (not the number)

volume of 1 mol of an ideal gas at STP

25

What is the value of standard molar volume

22.4 L

26

What is the ideal gas law formula?

pV=nRT

27

what is the value of R in the ideal gas law formula?

0.0821

28

what is the density of a gas INVERSELY proportional to?

temperature

29

what is the density of a gas DIRECTLY proportional to?

molar mass

30

M and m represent what?

M = moles/molarity & m = mass

31

what is the equation for finding density of a gas at STP?

d = MxP/RT then convert to moles

32

how do you manipulate the above equation (d=MP/RT) for a change in temperature?

add the temperature given to the constant temp. (273 K)

33

what is the equation for finding molar mass from the ideal gas law?

M = mRT/PV

34

Gases mix ____________ in any proportions

homogeneously

35

the pressure exerted by each gas in a mixture is called its _________?

partial pressure

36

what does Daltons law state about gases and pressure?

the total pressure is the sum of all of the partial pressures

37

the partial pressure of a gas is proportional to its_____?

mole fraction

38

what are the equations for finding total pressure? (Daltons Law)

P(a) = X(a) x P(total)
X(a) = n(a)/n(total)

39

what is the Kinetic molecular theory a model for?

Gas Behavior

40

How many postulates (points) are there in the Kinetic molecular theory?

three

41

what is the first postulate in the kinetic molecular theory?

-Gas particles are tiny with a lot of space between them
-the volume of each particle is so small compared to the overall volume it is assumed to be 0

42

what is the second point in the Kinetic molecular theory

particles are in straight, random, and constant motion except for when they collide with each other or container walls

43

what is the third point in the kinetic molecular theory?

-collisions are elastic (particles transfer energy but do not lose any b/c friction)
-total kinetic energy is constant
-particles do not influence each other outside of collisions

44

at a given temperature, all gases in a sample have the same what?

average kinetic energy