Question

(Competency 8.25,4 points) Do the following experiment in your home kitchen. Please take precautions to avoid burns. 2. Place about ½ cup of water in a glass or ceramic (not plastic) bowl. Cover the top of the bowl completely with a tightly stretched single layer of plastic wrap. Make sure that the plastic wrap makes a good seal with the sides of the bowl. This is important for the success of your experiment. Put the bowl in a microwave to cook for 2-3 minutes. The water should begin boiling after about 1 minute and a large volume of steam will be formed. Remove the bowl from the microwave and set it on the counter. Do not remove the plastic wrap. Let it sit and cool for a few minutes. Assuming the water is room temperature at the end of step (a), what are the partial pressures of water vapor and air inside the bowl/plastic wrap? Assuming that the water is at 95.5 °C (Why?), what is the partial pressure of water vapor inside the bowl at the end of step (b)? What is the partial pressure of air? Explain using thermodynamic principles what you observe with the plastic wrap and the contents of the bowl by the end of step (c). What is the partial pressure of water vapor at the end of step (c) compared to step (b)? What is the composition of the gas inside the bowl/plastic wrap? a. b. c. d. e. f.

Answer 1

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