12-1 Review and Reinforcement Name ______________________________
A Model to Explain Gas Behavior Date _______________ Period __________
_____1. A bicycle tire inflates when you pump a. compressibility
air into a valve on one side.
_____ 2. A car is supported on a “cushion of air.” b. has mass
_____ 3. An air mattress springs back to its c. fills container
original shape after being pressed.
______4. A balloon filled with air weighs more d. exerts pressure
than an empty balloon.
______5. The color of a gas is uniform throughout e. diffuses through other gases
the bottle containing it.
If the statement is true, write “true.” If it is false, change the underlined word or words to make the statement true. Write your answer on the line provided.
_____________________6. Although air is a mixture of several gases, it behaves like a single
gas.
_____________________7. Oxygen is diatomic, and, under similar conditions, its volume is
twice that of monatomic helium.
_____________________ 8. Air bags are used as safety devices because air cannot be
compressed.
_____________________ 9. Most gases are made up of single atoms.
_____________________ 10. According to the kinetic-molecular theory, the collisions between
gas particles are 100 percent elastic.
_____________________ 11. The pressure of a gas is simply a measure of the kinetic energy of
the gas particles.
_____________________ 12. The volume of a gas is equal to the volume of its container.
Indicate the relationship between the pairs of gas variables below by writing “increase,” “decrease,” or “not be affected” in the space provided. Assume that all other variables remain constant.
13. If the molecular speed of a gas increases, its rate of diffusion will ____________________.
14. If the temperature of the gas increases, the pressure of the gas will ___________________.
15. If the molecular weight of the gas increases, the total volume of the gas will ____________.
16. If the temperature of the gas decreases, the pressure of the gas will ___________________.
Complete the following assumptions about the nature of gases as presented by the kinetic-molecular theory by filling in the appropriate word or phrase from the list below.
perfectly elastic no force zero pressure
weak random motion kinetic energy potential energy
17. The volume of gas particles themselves is assumed to be ___________________.
18. Gas molecules are said to be in _____________________.
19. The collisions between gas particles are _____________________.
20. The temperature of a gas is a measure of the average ____________________ of the gas
particles.
21. Gas particles exert _____________________ on one another.
Answer each of the following question in the space provided.
22. Air is a mixture of colorless gases. Which properties of air are instrumental in propelling a sailboat? ________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
23. Use your knowledge of gas properties to explain why the molecular size of the individual gas particles has no effect on the total volume of the gas.
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