Sample exam final ep 4 BONU

sample exam ep 4

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____ 1. According to the kinetic theory, collisions between molecules in a gas ____.
a. are perfectly elastic c. never occur
b. are inelastic d. cause a loss of total kinetic energy


____ 2. The average speed of oxygen molecules in air is about ____.
a. 0 km/h c. 1700 km/h
b. 170 km/h d. 17,000 km/h


____ 3. Standard conditions when working with gases are defined as ____.
a. 0 K and 101.3 kPa c. 0 C and 101.3 kPa
b. 0 K and 1 kPa d. 0 C and 1 kPa


____ 4. How does the atmospheric pressure at altitudes below sea level compare with atmospheric pressure at sea level?
a. The atmospheric pressure below sea level is higher.
b. The atmospheric pressure below sea level is lower.
c. The pressures are the same.
d. Differences in pressures cannot be determined.


____ 5. The temperature at which the motion of particles theoretically ceases is ____.
a. –273 K c. 0 C
b. 0 K d. 273 C


____ 6. Consider an iron cube and an aluminum cube. If the two cubes were at the same temperature, how would the average kinetic energy of the particles in iron compare with the average kinetic energy of the particles in aluminum?
a. The average kinetic energy of the iron particles would be greater.
b. The average kinetic energy of the aluminum particles would be greater.
c. There would be no difference in the average kinetic energies.
d. No determination can be made based on the information given.


____ 7. The average kinetic energy of water molecules is greatest in ____.
a. steam at 100 C c. liquid water at 373 K
b. liquid water at 90 C d. ice at 0 C


____ 8. What is the key difference between a liquid and a gas?
a. intermolecular attractions c. average kinetic energy
b. the ability to flow d. the motion of their particles


____ 9. If a liquid is sealed in a container and kept at constant temperature, how does its vapor pressure change over time?
a. It continues to steadily increase.
b. It increases at first, then remains constant.
c. It increases at first, then decreases.
d. It continues to steadily decrease.


____ 10. An increase in the temperature of a contained liquid ____.
a. has no effect on the kinetic energy of the liquid
b. causes the vapor pressure above the liquid to decrease
c. causes fewer particles to escape from the surface of the liquid
d. causes the vapor pressure above the liquid to increase


____ 11. When the vapor pressure of a liquid is equal to the atmospheric pressure, the liquid ____.
a. has no observable changes. c. evaporates.
b. boils vigorously. d. begins to boil.


____ 12. Compared to the melting points of ionic compounds, the melting points of molecular solids tend to be ____.
a. similar c. lower
b. unpredictable d. higher


____ 13. Most solids ____.
a. are dense and difficult to compress c. are amorphous
b. are able to flow d. have a disorderly structure


____ 14. Crystals are classified into how many different crystal systems?
a. 4 c. 6
b. 5 d. 7


____ 15. The smallest group of particles in a crystal that retains the shape of the crystal is called the ____.
a. cube c. cage
b. unit cell d. crystal lattice


____ 16. The escape of molecules from the surface of a liquid is known as ____.
a. condensation c. evaporation
b. boiling d. sublimation


____ 17. The direct change of a substance from a solid to a gas is called ____.
a. evaporation c. condensation
b. sublimation d. solidification