Kinetic Theory Gases are composed of small separate particles called molecules Gas molecules are in constant motion All collisions between particles are perfectly elastic ID: 690644
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Slide1
Ever wonder why?
Episode 901Slide2
Kinetic Theory
Gases are composed of
small, separate
particles called molecules.
Gas molecules are in
constant motion
.All collisions between particles are perfectly elastic.The molecules of a gas display no attraction or repulsion for one another.The average kinetic energy of the molecules is directly proportional to the Kelvin temperature of the gas.
Episode 901Slide3
Ideal Gas
Gas whose
behavior conforms to the kinetic theory
– it is theoretical.
All gases behave as an
ideal gas
unless temperature is very low or pressure is very high.Episode 901Slide4
Gas Pressure
Pressure =
force / area
Atmospheric Pressure – the pressure
the earth’s
atmosphere
exerts due to its weightEpisode 901Slide5
Barometer
Instrument used to measure
atmospheric pressure.Invented by
Torecelli
Episode 901Slide6
Normal Atmospheric Pressure
Also called
standard pressure760 mm Hg760
torr1 atm
(atmosphere)
101.3
kPaStandard Temperature and Pressure1 atm
0⁰Celsius
STP
Episode 901Slide7
Instrument used to measure
gas pressureU-shaped tube partially filled with
mercuryOne end open to
confined gasOne end open to atmosphere
Manometer
Episode 901Slide8
CR Question 1
What would be the density of a 10 gram object that displaces two milliliters of water?
Five20
Five grams per milliliter20 grams per milliliter
Episode 901Slide9
CR Question 2
Is oxygen a metal, nonmetal, or metalloid?
MetalNonmetal
Metalloid
Episode 901Slide10
Review Question 1
Does the average kinetic energy of the gas particles in an inflated inner tube increase or decrease if the sun heats the inner tube from 20 degrees Celsius to 30 degrees Celsius?
Increase Decrease
Episode 901Slide11
Review Question 2
What is the name of the instrument used to measure the pressure of a confined gas?
ManometerPascalometer
Pressureometer
Barometer
Episode 901Slide12
Review Question 3
STP is Standard temperature and pressure
Zero degrees Celsius and one atmosphere pressureZero degrees Celsius and one hundrend one point three kilopascals
All of these
Episode 901Slide13
Review Question 4
Under what conditions of temperature and pressure does the behavior of a real gas differ from that of an ideal gas?
Very high temperature and very high pressure
Very high temperature anf very low pressure
Very low temperature and very low pressure
Very low temperature and very high pressure
Episode 901Slide14
Review Question5
The kinetic theory
Is a modelExplains gas behavior
Neither a nor bBoth a and b
Episode 901