TITLE: "IT'S EATING AWAY AT YOU" AUTHOR: Judy Grunke, Weiser Middle School; Weiser, Idaho (borrowed from Falma Moye) GRADE LEVEL: K-8, Earth or Physical Science TIME: 30 minutes--set-up, experiment, discussion. OVERVIEW: Acid rain is a major pollutant in the world today. This activity is designed to show the effect of acid rain on rock, edifices, and sculptures. PURPOSE: To show the effect of acid rain on limestone rock. OBJECTIVE(s): The student will be able to: 1. Demonstrate, using chalk and vinegar solution, the chemical reaction of acid on limestone. 2. Explain what happens in this process. 3. Identify the compounds used in the reaction and the gas which is given off. 4. Tell where acid rain originates. 5. Explain the effect of acid rain on limestone buildings and statuary. RESOURCES/MATERIALS: CLASS: Textbook, acid rain FOR EACH LAB GROUP: vinegar solution chalk eye dropper pan to set chalk in and to catch vinegar ACTIVITY AND PROCEDURES: 1. Place a piece of chalk in pan. 2. Using an eyedropper, have one student drop vinegar onto the chalk in a constant stream. 3. Observe the fizzing on the surface of the chalk when the vinegar is dropped. 4. Notice the crumbling of the chalk. TYING IT ALL TOGETHER: 1. Students can research the causes (man-made and volcanic eruptions) of acid rain and efforts to protect valuable buildings and statues. 2. Students can use the vinegar residue to demonstrate what happens to the dissolved material from chemical erosion by placing a small piece of basalt in the vinegar solution. (As vinegar evaporates, the dissolved material from the chalk precipitates to form a white mineral residue--caliche--on the surface.)
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