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