Properties of Gases 1) All gases have mass. Remember: We normally test gases in relation to “air”

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”

Click here for CO2 mass videoClick here for a Noble Gas

Demo


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]


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

http://cwx.prenhall.com/petrucci/medialib/media_portfolio/text_images/TB06_01.JPG


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


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


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]


4) It is easy to 4) It is easy to compress a compress a gas.gas.



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


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.


Click Here For a P-T Video Clip


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]

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Properties of Gases 1) All gases have mass. Remember: We normally test gases in relation to “air”