Chapter 3 Resource: Matter and its Changes

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Name Date Class Laboratory Activity 2 (continued) Hands-On Activities Part C 1. Dissolve 1/2 spoonful of Epsom salts in a test tube of water. 2. Dissolve 1/2 spoonful of washing soda in another test tube of water. 3. Observe what the mixtures in both test tubes look like. 4. Begin pouring the Epsom salts mixture into the petri dish near one edge of the dish. 5. At the opposite edge of the petri dish, begin pouring the washing soda mixture into the dish. 6. Observe what happens where the two mixtures meet. Record your observations in the table in the Data and Observations section. Part D 1. Place a dull, copper penny in the bottom of a petri dish. 2. Sprinkle salt over the top of the penny. Then use a dropper to cover the top of the penny with vinegar. Observe any changes in the penny. Record your observations in the table in the Data and Observations section. Data and Observations Substances Changes you observed Baking soda, calcium chloride, and water Cornstarch, water, and iodine 1. 2. Epsom salts, washing soda, and water Copper penny, salt, and vinegar 3. 4. Questions and Conclusions 1. Identify four signs that indicate that a chemical change has taken place. 2. In Part A, what evidence did you observe that a chemical change took place 3. In Part B, what evidence did you observe that a chemical change took place Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 14 Matter and Its Changes
Name Date Class Laboratory Activity 2 (continued) 4. In Part C, what change did you observe taking place 5. In Part D, what evidence did you observe that a chemical change took place Hands-On Activities 6. What do all these changes that you observed have in common Strategy Check Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. Can you observe and describe chemical reactions Can you identify signs of chemical reactions Matter and Its Changes 15
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Chapter 3 Resource: Matter and its Changes

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