Form a team of 3 for the Wikipedia project. Select a team leader as a point-of-contact for your team. The team leader will send the names of the team members and two possible ideas for your project to d-cahill@uiuc.edu with cc: to whsieh2@uiuc.edu. If you cannot find people to form a team, send an email note to d-cahill@uiuc.edu with two ideas you have for the Wikipedia project and I will try to match people's interests to form teams.
Homework problem 2 of AR Chapter 10.
Homework problem 3 of AR Chapter 10. (You can skip part (e) of problem 3). Note that in problem 3, the equations for rates do not have the correct units but since you are calculating only the ratios of rates, this will not matter.
Consider the evaporation of a drop of water from a surface held at 100°C into dry air. (a) Assume that desorption of molecules from the water surface is the rate limiting process. Estimate how long it will take for a radius r=2 mm drop of water to evaporate. (b) Assume that the diffusion of water molecules through still air is the rate limiting process. You can assume that the diffusive flux of water molecules has the 1/r dependence discussed in lecture. Estimate how long it will take for a r=2 mm drop of water to evaporate. You can assume that the diffusion constant of water vapor in air is the same as the self-diffusion constant of N2 gas.
Optional but encouraged (no grade assigned): measure how long it takes for a drop of water to evaporate from a 100°C surface. (You could do this experiment in your kitchen using a doubler-boiler).
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