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Changing Colors


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Description

In this challenge, learners have to figure out in what order to combine five solutions to change the color from clear, to yellow, to blue, and back to clear. The five chemicals are potassium iodide, sodium thiosulfate, sodium hypochlorite (Clorox bleach), soluble starch (Niagara spray starch), and water. The color changes indicate chemical reactions, and the lesson includes some background information about the reactions that create different colors. Suggestions are given for guiding learners through systematic approaches to making the different combinations and observing the results, and for explaining to different age groups what happens when the solutions are combined. Less

Learning Registry Activity

    Bookmarks

    Topics and Grades

    Grade: TK/K to 9

    Topics: Chemical Reactions & Stoichiometry, Physics, Earth & Space Science, Chemistry

    Resource Pedagogy

    Resource Type/Classification:

    • Teacher Materials


    Tool for: Students

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