Properties of Gases 1) All gases have mass. Remember: We normally test gases in relation to...
-
Upload
virginia-ostler -
Category
Documents
-
view
218 -
download
1
Transcript of Properties of Gases 1) All gases have mass. Remember: We normally test gases in relation to...
Properties of GasesProperties of Gases
1) All gases have mass.1) All gases have mass. Remember: We normally test Remember: We normally test
gases in relation to “air”gases in relation to “air”
Properties of GasesProperties of Gases
2) Gases will 2) Gases will always spread always spread to fill their to fill their containers containers completely.completely.
[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_11/FG11_07.JPG]
Properties of GasesProperties of Gases
3) Gases 3) Gases exert exert pressure pressure on on objects objects around around them.them.
[http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter09/Text_Images/FG09_01.JPG]
Click Here for a “Can
Crushing” Demo
Air is more dense near the surface of the earth, so it exerts more
pressure!
[http://www.space.gc.ca/asc/img/spacesuit_2_2_3_1_A.jpg]
Click Here for Proof of Atmospheric Pressure
Properties of GasesProperties of Gases
Sample Conversion:Sample Conversion: If the weather reports If the weather reports
atmospheric pressure as 31.5 atmospheric pressure as 31.5 inches of mercury outside, what inches of mercury outside, what is it in atmospheres?is it in atmospheres?
31.5 inHg 2.54 cmHg1 inHg
10 mmHg
1 cmHg
1 atm
760 mmHg
= 1.05 atm
Properties of GasesProperties of Gases
Pressure of Pressure of the the atmosphere atmosphere is measured is measured using a using a barometer.barometer.
[http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter09/Text_Images/FG09_03.JPG]
Vacuum
Properties of GasesProperties of Gases
Pressure of “trapped” gases can Pressure of “trapped” gases can be measured using a be measured using a manometer.manometer.
[http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/FG06_05.JPG]
Properties of GasesProperties of Gases
4) It is easy to 4) It is easy to compress a compress a gas.gas.
[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_11/FG11_05.JPG]
Properties of GasesProperties of Gases
5) Different gases will move 5) Different gases will move through one another in a through one another in a process called process called diffusiondiffusion..
This is also affected by the size This is also affected by the size of other gas particles (air) of other gas particles (air) around!around!
Click Here for a Diffusion of Bromine Video
Properties of GasesProperties of Gases
6) The pressure of a gas depends 6) The pressure of a gas depends on the temperature of a gas.on the temperature of a gas.
[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_11/FG11_17.JPG]
Click Here For a P-T Video Clip
Properties of GasesProperties of Gases
Kelvins are the Kelvins are the temperature temperature units used for units used for any calculation any calculation when when temperatures temperatures affect gases.affect gases.
K = 273 + K = 273 + °C°C
[http://abyss.uoregon.edu/~js/images/celsius_kelvin.gif]