224Chapter FiveGases6. If you put a drinking straw in water. place your finger over theopening, and lift the straw out of the water, some water stays inthe straw. Explain.7. A chemistry student relates the following story: I noticed mytires were a bit low and went to the gas station. As I was fillingthe tires, I thought about the kinetic molecular theory (KMT). Inoticed the tires because the volume was low, and I realized thatI 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 studentin this situation? Explainwhywe think pressure and volume tobe inversely related (draw pictures and use the KMT).8. Chemicals X andY(both gases) react to form the gasXY,but ittakes a bit of time for the reaction to occur. Both X and Yareplaced in a container with a piston (free to move), and you notethe volume. As the reaction occurs, what happens to the volumeof the container? (See Fig. 5.18.)9. Which statement best explains why a hot-air balloon rises whenthe 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 balloonincreases, making the density smaller. This lifts the balloon.b. Hot air rises inside the balloon, and this lifts the balloon.
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