fireworks_in_milk - University of Florida Chemistry...

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University of Florida Chemistry Outreach Program Fireworks in Milk! Estimated Time: 50 mins. + 10 mins. clean-up Topics: Surfactants, hydrophobic/hydrophilic interactions, “kitchen chemistry” Introduction: Almost everyone comes into daily contact with oils, fats, and other substances that they simply wash away with soap and water. The exact mechanism of soap (and why it works so well) remains largely a mystery to most students, however, and few realize the importance of the basic principles that underlie its processes. Objective: This lab will artfully illustrate the properties of a surfactant, using items that can be found in most household kitchens. Successful completion of this lab will allow students to grasp the concepts of surface tension and surfactant chemistry, understand how soap works, and (with an extension of the lab) be able to experimentally qualify the level of fat in milk through a simple, non-tasting method. Materials: -Several cell culture/Petri dishes (enough for each, or each group of students: four dishes per group) -Skim milk, 2% milk, whole milk, half & half milk -Yellow, blue, green, and red food coloring -Toothpicks (preferred) or cotton swabs -Household detergent/liquid soap -Cups (to aliquot small amounts of detergent/soap to students) -Newspapers/paper towels Safety: - Toothpicks may pose a choking hazard to younger children. Carelessly handled soap/detergent can
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This note was uploaded on 09/18/2011 for the course CHM 3218 taught by Professor Stewart during the Spring '08 term at University of Florida.

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fireworks_in_milk - University of Florida Chemistry...

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