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Flashcards in Properties of Gases Deck (15)
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1

what are some common properties of gases?

volume changes with temp and pressure
low viscosity
low density under normal conditions
gases are miscible
compressible
occupy the shape of containers quickly

2

what is the defining characteristic of a gas?

the pressure they exert

3

what is pressure exerted by a gase dependant upon?

the temperature of the gas
the amount of moles of the gas
the volume of the gas

4

what is the formula for pressure?

force/area

5

what two devices are used to measure pressure and how do they work?

barometer: competition between atmospheric pressure and gravity

Monometer: measures the pressure exerted from two gases

6

what is the SI units for pressure?

Newton/Pascals ... N/Pa

7

what is boyles gas law?

at constant temp, the volume of a fixed amount of gas is inversely proportional to the applied(external) pressure

or P*V= constant of proportionality

8

what is charles gas law?

at constant pressure, the volume of a fixed amount of gas is directly propertional to its absoulte temperature

or V/T= constant where temp is in kelvin

9

what is avogadros gas law?

at fixed temperature and pressure, the volume of a gas is directly proportional to the amount, in moles, of gas

or V/N= constant

10

what do you get when you combine all the gas laws?

the ideal gas law...

PV=nRT

where
P=pressure
V=volume
n=moles
R= universal gas constant
T=temperature

11

when a gas has a high density, what does this mean with reference to the individual atoms?

more dense= more collisions as the atoms travel shorter distances

12

when a gas has a low density, what does this mean with reference to the individual atoms?

less dense= less collisions, travel greater dstiances

13

all constituents of an ideal gas, whether atoms or moolecules...

act independently

14

what is daltons law of partial pressures?

in a mixture of gases the total pressure exerted is the sum of the partial pressures that each gas would exert if it were alone under the same conditions

15

what are mole fractions in a mixture of gases?

each component in a mixture contributes a fraction of the total number of moles in the mixture, the mole fraction (X) of that component