224 Chapter Five Gases 6. If you put a drinking straw in water. place your finger over the opening, and lift the straw out of the water, some water stays in the straw. Explain. 7. A chemistry student relates the following story: I noticed my tires were a bit low and went to the gas station. As I was filling the tires, I thought about the kinetic molecular theory (KMT). I noticed the tires because the volume was low, and I realized that I was increasing both the pressure and volume of the tires. "Hmmm," I thought, "that goes against what I learned in chem-istry, where I was told pressure and volume are inversely pro-portional." What is the fault in the logic of the chemistry student in this situation? Explain why we think pressure and volume to be inversely related (draw pictures and use the KMT). 8. Chemicals X and Y (both gases) react to form the gas XY, but it takes a bit of time for the reaction to occur. Both X and Yare placed in a container with a piston (free to move), and you note the volume. As the reaction occurs, what happens to the volume of the container? (See Fig. 5.18.) 9. Which statement best explains why a hot-air balloon rises when the air in the balloon is heated? a. According to Charles's law, the temperature of a gas is di-rectly related to its volume. Thus the volume of the balloon increases, making the density smaller. This lifts the balloon. b.
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