1. FOIL BOILER LAB Init 4/8/2014 by Daniel R. Barnes What shape boils water fastest?

2. NOTE for 2014-2015 and afterward: PROCEDURE CHANGE! Barnes, if you do this lab again, instead of measuring how long it takes to boil away 20 mL of water, instead heat for a fixed amount of time (3 min would be good) and measure the gross mass afterward. This is to obviate the problems associated with water being to clear to see, students being too short to see inside the container, and water hiding in the folds of the foil container.

3. SWBAT... Design, build, and test, and troubleshoot an aluminum foil water- boiling container.

4. FOIL BOILER LAB Rules: 1.You get a single 12” x 12” sheet of aluminum foil to make your boiler out of. 2.The boiler must prove that it doesn’t leak by holding 20 mL of water for one minute without going down in mass by more than 0.1 g. Document that it passed this test. 3.[IGNORE THIS STEP!] When you do boil the 20 mL of water in it, you must take the temperature of the water once every minute until a full minute after the water has all evaporated. (Will this harm the thermometer?... ) 4.You need to test at least two designs that are significantly different from one another. Draw & describe each. 5.You must use the same ring stand apparatus to hold up the boilers during each trial. 6. Trial = time to make 20 mL of water disappear by vaporization. 7. After trial, boiler must prove that it still does not leak water.

5. FOIL BOILER LAB What to include in your REPORT: 1. Sketch of your heating apparatus, including how high the bottom of your foil container is when you’re heating it. 2.For each foil container you made and tested: a. Sketch of the container, including measurements b. Documentation that it passed the leak test (m i & m f @ 1 min) c. How long it took to boil away the water 3. What problems did you have? How did you/could you remedy them? 4. What container boiled the water away the quickest? Why do you think so? If you could test another container design, what design would you try out? Why? SWBAT design, build, and test, and troubleshoot an aluminum foil water-boiling container.

6. Try blackening the bottom of the foil vessel with a candle flame. The carbon is non-reflective and might allow faster heat transmission. Try using more than one layer of foil. What effect do you think it will have? Try variations in size of opening. A spherical container with a small hole on the top should behave differently than a simple, open, beaker-shaped cylindrical container. Try more direct contact with the flame by not using gauze, and, instead, using foil “hook” projections to hang from a ring clamp.