Properties of Gases

1
Properties of Gases

• 1) All gases have mass.
• Remember We normally test gases in relation to
  air

2
Click here for CO2 mass video
Click here for a Noble Gas Demo
3
Properties of Gases

• 2) Gases will always spread to fill their
  containers completely.

http//wps.prenhall.com/wps/media/objects/476/488
316/Instructor_Resources/Chapter_11/FG11_07.JPG
4
Properties of Gases

• 3) Gases exert pressure on objects around them.

Click Here for a Can Crushing Demo
http//wps.prenhall.com/wps/media/objects/602/616
516/Media_Assets/Chapter09/Text_Images/FG09_01.JPG

5
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
6
http//cwx.prenhall.com/petrucci/medialib/media_po
rtfolio/text_images/TB06_01.JPG
7
Properties of Gases

• Sample Conversion
• If the weather reports atmospheric pressure as
  31.5 inches of mercury outside, what is it in
  atmospheres?

31.5 inHg
2.54 cmHg
10 mmHg
1 atm
1 inHg
1 cmHg
760 mmHg
1.05 atm
8
Properties of Gases

• Pressure of the atmosphere is measured using a
  barometer.

Vacuum
http//wps.prenhall.com/wps/media/objects/602/616
516/Media_Assets/Chapter09/Text_Images/FG09_03.JPG

9
Properties of Gases

• Pressure of trapped gases can be measured using
  a manometer.

http//cwx.prenhall.com/petrucci/medialib/media_p
ortfolio/text_images/FG06_05.JPG
10
Properties of Gases

• 4) It is easy to compress a gas.

http//wps.prenhall.com/wps/media/objects/476/488
316/Instructor_Resources/Chapter_11/FG11_05.JPG
11
Properties of Gases

• 5) Different gases will move through one another
  in a process called diffusion.
• This is also affected by the size of other gas
  particles (air) around!

Click Here for a Diffusion of Bromine Video
12
Properties of Gases

• 6) The pressure of a gas depends on the
  temperature of a gas.

Click Here For a P-T Video Clip
http//wps.prenhall.com/wps/media/objects/476/488
316/Instructor_Resources/Chapter_11/FG11_17.JPG
13
Properties of Gases

• Kelvins are the temperature units used for any
  calculation when temperatures affect gases.
• K 273 C

http//abyss.uoregon.edu/js/images/celsius_kelvi
n.gif