| abstract
| - Lab: Gases LEARNING GOALS OF THIS LAB: 1.
* Investigate the effect of pressure on the volume of an ideal gas when other variables are held constant. 2.
* Practice fitting functions to data in order to relate graphical patterns to mathematical expressions. Boyle’s Law: Pressure and volume of a gas. You have a plastic syringe apparatus. Design an experiment to find the relationship between pressure and volume of a gas. Available equipment: Plastic syringe apparatus1 (wood blocks as platform and base, piston, 25 mL syringe), ring stand, clamp, 5 chemistry textbooks, lab balance, air Safety: Safety goggles are not required in this lab. Be careful not to drop a book on your feet.
* The apparatus consists of a graduated syringe with a movable piston. In order to read the volume of the trapped gas correctly, you must always read the measurement on the side of the piston that is in contact with the gas. Use the apparatus to compress a sample of air. As the pressure of the air changes, you will monitor and collect data on the resulting changes in volume. Write the following in your report:
* 1.
* State Boyle’s Law in your own words. Then write the mathematical equation for Boyle’s Law. Which variables are held constant? 2.
* Examine the equipment that you have and decide what experiment you can design whose outcome you can predict applying the model of an ideal gas. Describe your experimental design with a labeled diagram. 3.
* Use the hypothesis that the gas inside the container is ideal to predict the outcome of the experiment. 4.
* What assumptions are you using in your prediction? 5.
* List the sources of experimental uncertainty. How can you minimize them? 6.
* Record your data in an appropriate format. Then use your data to make a graph from which a mathematical expression of Boyle’s Law can be obtained. How would you obtain pressure that is applied to the piston? Include experimental uncertainties when you record your data. 7.
* Did the outcome of the experiment match the prediction within the uncertainties? 8.
* What experiment did you design and perform: an observational, a testing or an application experiment? How do you know?
* Build a Lung model Observe the motion of your rib cage as you breathe. Available equipment: an open plastic bottle with the bottom cut off, a surgical glove, 15-inch balloons, and rubber bands.
* 1.
* Describe in words how the process of inhaling and exhaling air from your lungs work. 2.
* Using the suggested materials and construct an apparatus that can be used as a breathing model. 3.
* Describe the model. Explain how the model fits the motion of your rib cage. List any assumptions that are inherent in this model. 4.
* What experiment did you design and perform: an observational, a testing or an application experiment? How do you know?
* Reference:
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