Activity Sheet Chapter 6, Lesson 6 Using Chemical Change to Identify an Unknown
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1 Activity Sheet Chapter 6, Lesson 6 Using Chemical Change to Identify an Unknown Name Date DEMONSTRATION 1. Your teacher poured iodine solution on top of two white powders. How do you know that these two similar-looking powders are really different? 2. Adding iodine solution to one powder caused a physical change, while adding the iodine solution to the other powder caused a chemical change. Which powder probably reacted chemically with the iodine solution? How do you know? ACTIVITY Can you use the characteristic ways substances react to tell similar-looking substances apart? Baking soda in cup Baking powder in cup Cream of tartar in cup Cornstarch in cup Water in cup Vinegar in cup Tincture of iodine solution in cup Universal indicator solution in cup 4 Popsicle sticks Testing chart, either laminated or with a piece of wax paper over it 4 droppers 2011 American Chemical Society Middle School Chemistry Unit 601
2 Procedure 1. Use the end of a Popsicle stick to place four equal piles of baking soda on the testing chart in the baking soda column. Let students know that they should not use all of the powder at this time. The remaining powder will be used in the Extend portion of this lesson. 2. Add 5 drops of water to the first pile of baking soda. Record your observations in the chart on the activity sheet. 3. Continue testing each pile of baking soda with a different test solution and recording your observations. 4. Test each of the powders with the test solutions the way you tested baking soda and record your observations. Can you use the characteristic ways substances react to identify an unknown powder? Test solutions Unknown in cup 1 Popsicle stick Water Testing sheet 4 test solutions 4 droppers Procedure 1. Place four samples of your group s unknown powder in the Unknown column on the testing chart. 2. Test the unknown with each test solution in the same way you tested each of the other powders. 3. Compare the set of reactions for the unknown with those of the other powders. Vinegar Iodine solution Indicator solution Unknown 602 Middle School Chemistry Unit 2011 American Chemical Society
3 3. What is the identity of the unknown? Which observations led you to your conclusion? EXPLAIN IT WITH ATOMS & MOLECULES 4. On the molecular level, why did the different substances react in a characteristic way with the test solutions? TAKE IT FURTHER Baking powder is a combination of different powders baking soda, cream of tartar, and cornstarch. Two of these three powders react with one another and produce carbon dioxide gas when water is added. Which two substances in baking powder react with one another and produce a gas when water is added? Baking soda in a cup Cornstarch in a cup Cream of tartar in a cup 3 Popsicle sticks Toothpicks Wax paper Water Dropper 2011 American Chemical Society Middle School Chemistry Unit 603
4 Procedure 1. Use separate popsicle sticks to place a small amount of two powders on a piece of wax paper. 2. Use a toothpick to mix the powders. 3. Use a dropper to add about 5 drops of water to the combined powders and record your observations. 4. Repeat Steps 1 and 2 until you have tested all three combinations. Baking soda + cornstarch Baking soda + cream of tartar Cornstarch + cream of tartar 5. Your teacher did a demonstration comparing the way vinegar and cream of tartar react with indicator solution. Based on your observations, why do you think the baking soda and cream of tartar reaction is similar to the baking soda and vinegar reaction? 604 Middle School Chemistry Unit 2011 American Chemical Society
5 Results Table Test solutions Baking Soda Baking Powder Cream of tartar Cornstarch Unknown Water Vinegar Iodine Indicator
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