# Ch 9 Ppt

The flashcards below were created by user DesLee26 on FreezingBlue Flashcards.

1. Gas mixtures are __ and __.
• homogeneous
• compressible
2. Gases above us __ on us, causing __ affected by the __.
• push down
• pressure
• gravitational pull
3. What is the typical tool for measuring pressure?
barometer
4. What is the amount of mercury that goes in a barometer?
760 mm
5. In a barometer, as the pressure incresaes, what happens to mercury?
As the pressure decreases, what happens to mercury?
• pressure increses, mercury goes up; greater height
• pressure decreases, mercury goes down; smaller height
6. Ideal Gas
a gas whose behavior follows the gas laws exactly; independent; a gas that doesn't interact with anything
7. THe physical properties of a gas can be defined by four variables:
• pressure
• temp in K
• volume
• number of moles
8. What is the formula for the Combined Gas Law?
(P1V1/T1)=(p2V2/T2)
9. Another name for Boyle's Law?
Relationship between volume and pressure?
• Pressure-Volume Law
• inverse relationship
10. Another name for Charles' Law?
Relationship between volume and temperature?
• Temperature- Volume Law
• directly proportional
11. Significance of absolute zero?
no motion
12. Formula for:
Boyle's Law
P1V1=P2V2
13. Formula for:
Charles' Law
V1/T1=V2/T2
14. Formula for:
V1/n1=V2/n2
15. Ideal gases obey an equation incorporating the laws of __, __, and __.
The formula is:
• PV=nRT
16. Formula for:
Density and Molar Mass Calculations
d=mass/ volume= (n x M)/ V = (P x M)/ (R x T)
17. You can calculate the __ or __ of a gas. The density of a gas is usually very __ under atmospheric conditions.
• density
• molar mass (M)
• low
18. In __, for a constant temperature and pressure, volume is __ to moles.
• gas stoichiometry
• proportional
19. Mole Fraction
• Xi= (ni)/(ntotal) or
• Xi= Pi/Ptotal
20. Kinetic Molecular Theory:
What does it present?
physical properties of gases in terms of hte motion of individual molecules
21. Postulates of Kinetic-Molecular Theory:
1
A gas consists of tiny particles, either atoms or molecules, moving about at random
22. Postulates of Kinetic-Molecular Theory
2
The volume of hte particles themselves is negligible compared with the total volume of the gas; most of the volume of a gas is empty space
23. Postulates of Kinetic-Molecular Theory
3
The gas particles act independently of one another; there are no attractive or repulsive forces between them
24. Postulates of Kinetic-Molecular Theory
4
Collisions of the gas particles, either with other particles or with the walls of a container, are elastic (constant temp)
25. Postulates of Kinetic-Molecular Theory
5
The average kinetic energy of the gas particles is proportional to the Kelvin temperature of the sample
26. What is Root-Mean-Square
measure of the average molecular speed
27. Diffusion
mixing of different gases by random molecular motion and collision
28. Effusion
when gas molecules escape without collision, through a tiny hole into a vacuum
29. Graham's Law
rate of effusion is proportional to its rms speed
30. Deviation results from assumptions about ideal gases. What are the two
• molecules in gaseous state do exert any force, either attractive or repulsive on one another
• Volume of the molecules is negligibly small compared with that of the container
31. The volume of a real gas is __ than predicted by the ideal gas law.
larger
32. At lower pressure, the volume of the gas particles is __ compared to the total volume.
negligible
33. At higher pressure, the volume of the gas particiles is __ to the total volume.
more significant compared
34. The volume ofa real gas at high pressure is __ than the ideal value.
larger
35. Attractive forces between particles become more important at __.
higher pressures
 Author: DesLee26 ID: 192870 Card Set: Ch 9 Ppt Updated: 2013-01-28 04:57:55 Tags: CHM 112 Folders: Description: Gases: Their Properties and Behavior Show Answers: