Mystery Powder Analysis

Mystery Powder Analysis

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Prior Knowledge Questions (Do these BEFORE using the Gizmo.) A white powder is found spilled on the kitchen floor of a crime scene. A similar powder is found on the shoes of a suspect in the crime. ... 1. What are some powders that you might find on the kitchen floor? Baking Soda, Baking powder, corn starch and salt 2. How could you tell if the powder was salt, sugar, flour, or baking soda? By using your 5 senses Gizmo Warm-up The Mystery Powder Analysis Gizmo™ allows you to use a variety of tests to identify unknown substances. To start, drag the Baking soda test tube into the “Place tube here” area. 1. Under Appearance, click Test. Is baking soda a fine powder (no visible grains), or is it coarse (visible grains)? No visible grains 2. Litmus paper is an indicator of acids and bases. Under Litmus test, click Test. Which of the following results occurred? (Circle the answer.) A. Both strips red (acid) C. One red, one blue strip (neutral) B. Both strips blue (base) 3. Some substances react with vinegar to produce carbon dioxide, visible as bubbles. Under Vinegar test, click Test. Does the vinegar bubble? Yes the vinegar bubbles 4. The blue Biuret solution turns bright purple in the presence of proteins. Iodine solution turns dark purple in the presence of starch. Try each of these tests. Does baking soda contain protein? No Does baking soda contain starch? No [Show More]