Chapter 3 Resource: Matter and its Changes

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Name Date Class Hands-On Activities Observing Yeast Procedure 1. Observe a tablespoon of dry yeast with a magnifying lens.Draw and describe what you observe in the table below. 2. Put the yeast in 50 mL of warm, not hot, water. 3. Compare your observations of the dry yeast with those of the wet yeast. 4. Put a pinch of sugar in the water and observe for 15 minutes. 5. Record your observations in the table below. Data and Observations Table 1 Draw what you observe. Describe what you observe. Dry yeast Yeast, warm water Yeast, warm water, and a pinch of sugar Analysis 1. Are new substances formed when sugar is added to the water and yeast Explain. 2. Do you think this is a chemical change or a physical change Explain. Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 4 Matter and Its Changes
Name Date Class Liquid Layers Lab Preview Directions: Answer these questions before you begin the Lab. 1. Why is the irritant symbol used in this lab Hands-On Activities 2. How much volume is measured for each of the five liquids Why must you shake up a bottle of Italian salad dressing before using it Have you observed how the liquids in some dressings separate into two distinct layers In this lab, you will experiment with creating layers of liquids. Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. Real-World Question What would several liquids and solids of different densities look like when put into the same container Materials 250-mL beaker graduated cylinder corn syrup glycerin water corn oil rubbing alcohol penny wood sphere rubber ball Safety Precautions Goals ■ Create layers of liquids using liquids of different densities. ■ Observe where solids of different densities will rest in the liquid layers. ■ Infer the densities of the different materials. Procedure 1. Pour 40 mL of corn syrup into your beaker. 2. Slowly pour 40 mL of glycerin into the beaker. Allow the glycerin to trickle down the sides of the container and observe. 3. Slowly pour 40 mL of water into the beaker and observe. 4. Repeat step 3 with 40 mL of corn oil and then 40 mL of rubbing alcohol. 5. Carefully drop the penny, wood sphere, and rubber ball into the beaker and observe where these items come to a stop. Matter and Its Changes 5
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Chapter 3 Resource: Matter and its Changes

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