Chemical Tests Targeted Grade Level --3 Developed by National Science Resource Center Distributed by Carolina Biological

Chemical Tests Module Overview

This unit deepens third-graders' understanding of chemistry by challenging them to explore and determine the identity of five common household chemicals, such as baking soda and cornstarch. They begin by focusing on the physical properties of color, form, and texture. Next, they explore chemical properties by observing how the powders interact with water, vinegar, iodine, and red cabbage juice. These tests enable them to explore phenomena such as crystallization and to observe the processes of evaporation and filtration. Finally, students apply their skills and their knowledge of the identifying properties of the five chemicals to identify a variety of "mystery" mixtures. As a result of conducting these investigations, students develop scientific skills such as observing and recording results, forming conclusions on the basis of experience, communicating results, and applying their knowledge to solve problems.

Descriptions of the Science and Technology for Children ^tm (STC) units © 1997 National Academy of Sciences. Reproduced with permission from the National Science Resources Center (NSRC), Washington, DC. For more information about the STC ^tm program and other NSRC programs and activities visit the NSRC web site. For information on ordering the STC ^tm curriculum visit the Carolina Biological Supply Company web site.

These module web pages were initially created by Sandra McDonald, Brookhill Elementary School, Athens City Schools and LeeAnn Baggett, Eastwood Elementary School, Decatur City Schools. Please address comments or questions to hasp@dcs.edu

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