Ap Chem Ch. 10-11 Flashcards Preview

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4 properties of gases:

-expand to fill their containers
-highly compressible
-always mix homogeneous with other gases
-only occupy a small fraction of the actual volume of their container
-extremely low densities

1

Force(massXacceleration) acting on an object per unit area.

Pressure-

P=f/a

2

Weight of air per unit of area

Atmospheric pressure

3

Pascals-SI units

1 Pa= 1 N/m^2

4

Bar

1 bar= 10^5 Pa= 100 kPa

5

Difference in the heights measured in mm(h) of two connected columns of mercury

mm Hg , torr

6

Normal atmospheric pressure at sea level

Standard pressure

7

Convertions for standard pressure

1 atm = 760 torr = 760 mm Hg = 101.325 kPa

8

Volume is _________ proportional to Pressure.

Inversly

P1V2=P2V2

9

Voulme is ___________ proportional to temperature

Directly

10

The volume of a gas at constant temperature and pressure is _________ proportional to the number of moles of the gas.

Directly


11

Pressure is ________ proportional to kelvin temperature.

Directly

12

Charles' law

V1 V2
➖ = ➖
T2 T2

13

Boyle's law

P1V2=P2V2

14

Gay-lussac' law

P1 P2
➖ = ➖
T2 T2

15

The product of the pressure and volume of a fixed quantity of gas is ______ proportional to the kelvin temperature.

Directly

16

Conbined gas law

P1V1 P2V2
➖➖ = ➖➖
T1 T2

17

Ideal gas law:

PV=nRT

18

Constants for R( ideal gas constant)

.08206 L(atm) / mol( k)
8.314 L(kPa) / mol(k)
62.36 L(mm Hg) / mol(k)
8.314 J / mol(k)

19

Solving for the volume of 1 MOL at standard temperature and pressure (STP) gives 22.41 L / mol

Standard molar volume

20

Molar mass form of ideal gas law

M= mRT
------
PV

21

Density form of the idal gas law

D= MP
-----
RT

22

In which cases would you know you have to use Gas stoichiometry ?

* they have to be at constant pressure and temperature
* look for an equation

23

The total pressure of a mixture of gases equals the sum of the pressures that each would exert if it were present alone.

Dalton's law of partial pressures
P(total)= P1+P2+P3…

24

Gases consist of large numbers of molecules that are in continuous, random ______.

Motion

25

The speed of a molecule possessing AVERAGE KINETIC ENERGY.

Root-mean-square speed

26

The escape of gas molecules through a tiny hole into an evacuated space.

Effusion

27

The spread of one substance throughout a space or throughout a second substance.

Diffusion

28

Which diffuse faster, lighter molecules or heavier molecules??

Lighter molecules

29

Distance between collisions

Mean free path