Kinetic - Molecular Theory
and Gases
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Chapter 1. Kinetic - Molecular Theory and Gases
C HAPTER
1
Kinetic - Molecular Theory
and Gases
Worksheet
Name _____________________ Class ______________________ Date ________________
Answer each of the questions below to show your achievement of the lesson objectives
Lesson Objective: State the main points of the kinetic molecular theory, and describe how it relates to the
properties of an ideal gas.
1. All of the following except one are forms of matter
a.
b.
c.
d.
gas
solid
electronegativity
liquid
2. Which of the following is the correct statement about the effects of temperature (T) on the average kinetic
energy of gas particles (KE)?
a.
b.
c.
d.
increase in T → decrease in KE
increase in T → no effect on KE
decrease in T → increase in KE
decrease in T → decrease in KE
3. The forces of attraction between molecules of an ideal gas are
a.
b.
c.
d.
ionic
non-existent
dipole-dipole
electrostatic
4. The kinetic-molecular theory assumes that
a.
b.
c.
d.
5.
6.
7.
8.
molecules are always in motion
above room temperature, molecules are in motion
molecules are not in motion at temperatures below freezing
temperature has no effect on molecular motion
True/False:
True/False:
True/False:
True/False:
Gas molecules are far apart.
An ideal gas is an imaginary gas.
The kinetic-molecular theory only applies to gases.
Collisions between gas molecules result in loss of kinetic energy.
9. Gas particles are in constant _______ motion in _______ directions.
10. There are no forces of _________or _________ between gas particles.
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11. The kinetic-molecular theory as applied to gases has _____ basic assumptions.
Lesson Objective: Define pressure and describe how gases exert pressure.
12. Pressure equals
a. force
area
area
b. force
c. force × area
d. force + area
13. The earth’s atmosphere exerts pressure because
a.
b.
c.
d.
high temperatures increase gas motions
gravity pulls gas molecules down
more gas molecules = more pressure
higher altitude = higher pressure
14. True/False: A heavier rock exerts more pressure on the ground than a lighter rock.
15. True/False: Gas pressure results from collisions of gas molecules with the sides of a container.
16. Pressure is defined as the _____ per unit area on a ______.
Lesson Objective: Understand the barometer and how it measures atmospheric pressure. Convert between
units of gas pressure.
17. A barometer is used to measure
a.
b.
c.
d.
gas pressure for experiments
atmospheric pressure
vacuum pressure
gas pressure in enclosed systems
18. Only one of the following is not used to measure air pressure
a.
b.
c.
d.
manometer
aneroid barometer
mercury barometer
sphygmomanometer
19. True/False: Evangelsista Torricelli invented the barometer.
20. True/False: The mm Hg is the standard unit of pressure.
21. Perform the following conversions:
a.
b.
c.
d.
698 torr to kPa
107 kPa to atm
0.9 atm to mm Hg
93.2 kPa to mm Hg
Lesson Objective: Relate temperature to average kinetic energy.
22. One of the following statements about absolute zero is not true
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a.
b.
c.
d.
Chapter 1. Kinetic - Molecular Theory and Gases
absolute zero = zero degrees K
absolute zero is the temperature at which there is no electron movement
absolute zero is the temperature at which there is no molecular motion
absolute zero is based on a theoretical limit
23. The kinetic energy of particles in a sample of NaCl
a.
b.
c.
d.
increase with an increase in temperature
decrease with an increase in temperature
increase with a decrease in temperature
is not affected by a change in temperature
24. True/False: At room temperature, the average kinetic energy of ice is the same as the average kinetic energy
of steam.
25. True/False: Absolute zero has been reached in the laboratory.
26. As temperature _______, the range of kinetic energies increases and the distribution curve ____________.
27. When a person stands on the floor, his feet exert pressure on the surface. That pressure is related to both the
mass of the person and the surface area of his feet. If the person were holding a heavy object, the pressure
would increase because of a greater force. Alternatively, if the person stands on his toes, the pressure also
increases because of a decrease in the surface area.
28. A ballerina has a mass of 54.5 kg. Her feet occupy a space of 220 cm
29. 2
30. . Calculate the pressure exerted on the floor when she is standing flat-footed. When dancing
31. en pointe
32. (on the tips of her toes), her shoes occupy a space of 30 cm
33. 2
34. . Calculate the new pressure.
35. One drop of water has a volume of about 0.05 mL. How many atoms of helium at STP would occupy that
volume?
3