Which of the following statements correctly describe gases? 1. Gases exhibit the phenomenon of flow. 2. Molecular forces of attraction are minimal. 3. Gases are difficult to compress. 4. Gases expand to fill their container
a. 1 and 2 only
b. 1, 2, and 4 only
c. 2, 3, and 4 only
d. 3 and 4 only
ANS: B
In a gas, molecular attractive forces are very weak. Thus, gas molecules, which lack restriction to their movement, exhibit rapid, random motion with frequent collisions (Figure 6-1, C). Gases have no inherent boundaries and are easily compressed and expanded. Moreover, like liquids, gases can flow.
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