Transcription of LESSON 7: Milk Rainbow
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LESSON 7: Milk Rainbow
92 LESSON 1:Goofy Putty92 LESSON 1:Goofy PuttyYou Be The Chemist Activity Guides |page 92 You Be The Chemist Activity Guides |page 92 You Be The Chemist Activity Guides |page 92 You Be The Chemist Activity Guide |page 92 LESSON 7:Milk RainbowESTIMATED TIMES etup:5 minutes|Procedure:5 10 minutes DESCRIPTIONC reate swirls of color in milk and explore a propertyof liquids known as surface tension. OBJECTIVEThis LESSON will demonstrate the property of surfacetension and the effect that soap, a surfactant , has on thesurface tension of milk. Students will apply soap tomilk with food coloring on the surface to visualize theeffect of soap on the surface tension of milk. Thelesson can be extended to discuss a type of mixturescalled emulsions.
Soap is a surfactant. A surfactant is a substance that has the ability to reduce the surface tension of a liquid. Therefore, when a drop of liquid dish soap is added to milk, the surface tension of the milk is reduced. As this occurs, the fat and protein particles in the milk can move more freely and easily. In addition, the molecules that make up
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