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Investigatory Project

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Submitted By chadomu
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WMRC

Greening School’s
Green Chemistry Lesson
Glue From Milk
GS005-008

Objectives
1. Examine how a chemical reaction can change into a new product, 2. Understand how renewable resources can be used in our everyday lives

Materials
• • • • • • • • • • • • • 2 one-ounce medicine cups Safety goggles Plastic spoon (reuse) Basket-type coffee filter 2 9-once clear (reusable) plastic cups 3-quart package of powdered non-fat milk 1 ½ cups vinegar 8 ounce box of baking soda set of measuring spoons Measuring cup Hot water (1/3 – ½ cup) Plastic or newspaper (to cover table if necessary) Paper for gluing Towels for cleanup

Green Chemistry Principles
• • Safety first and last Use renewable resources

IL State Standards (Science)
11.A, 12.B, 12.C, 12.E, 13.B

• Levels
Middle School (Use as a demonstration for elementary school)

Vocabulary
Curd, Whey, Casein, Rennin

Time
One class period

Overview Utilizing renewable resources in the classroom visually illustrates the principles of Green Chemistry. The Milk and Glue activity demonstrates to the students that you can take a renewable resource-milk in this case, and through a chemical reaction, turn it into a usable product such as glue. The activity also shows the students that chemistry can be fun. One batch of glue will be made, although this glue does not have a long shelf life. Procedure 1. 2. 3. 4. Measure ¼ cup of hot water Pout into a clear 9-ounce cup Add 2 tablespoons of powdered mil to the water and stir until dissolved. Add one tablespoon of vinegar to the mixture and stir. You should see the milk begin to separate into solid chunks of curd and a watery liquid called whey. 5. Stir until the milk is well separated. [This separation works best when the milk is very warm or hot. That is why powdered milk and hot water are used. If your

milk does not separate well, try a little more…...

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