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. CONTENT TOPICSS cientific inquiry; states of matter; properties ofmatter; attractive forces (surface tension ); mixtures MATERIALSoWhole milk oWaterproof plate or shallow bowl oFood coloring oLiquid dish soap oCotton swabsAlways remember to use the appropriate safetyequipment when conducting your to the Safe ty Firstsection in the Res our ce Gui deon pages 421 423 for more detailed information aboutsafety in the ahead to page 95 to view theExperimental & RESEARCHBACKGROUNDM atter exists primarily as a solid, liquid, or gas on theearth.

surface tension of the milk supports the dye molecules ... variables, as well as whether there is a control setup for the experiment. (Hint: If soap is not added to the milk, do the results change?) Review the information in the Scientific Inquiry section on pages 14–16 to discuss variables.

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