Chapter 3 Resource: Matter and its Changes

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Name Date Class (continued) Hands-On Activities Conclude and Apply 1. Draw and Label On a separate sheet of paper, draw a picture of the liquids and solids in your beaker. Label your diagram. 2. Describe what happened to the five liquids when you poured them into the beaker. Why did the liquids behave this way 3. If water has a density of 1 g/cm 3 , infer the relative densities of the rest of the materials. 4. List the liquids and solids in order from the highest density to the lowest density. Communicating Your Data Draw a labeled poster of the substances you placed in your beaker. Research the densities of each substance and include these densities on your poster. For more help, refer to the Science Skill Handbook. Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 6 Matter and Its Changes
Name Date Class Design Your Own Fruit Salad Favorites Lab Preview Directions: Answer these questions before you begin the Lab. 1. What safety precautions are listed for this lab Hands-On Activities 2. What information might need to be recorded in a data table while you observe changes in a fruit salad When you are looking forward to enjoying a tasty, sweet fruit salad at a picnic, the last thing you want to see is brown fruit in the bowl. What can you do about this problem Your teacher has given you a few different kinds of fruit. It is your task to perform a test in which you will observe a physical change and a chemical change. Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. Real-World Question Can a chemical change be controlled Form a Hypothesis Based on your reading and observations, state a hypothesis about whether you can control a chemical change. Possible Materials bananas apples pears plastic or glass mixing bowls (2) lemon/water solution (500 mL) paring knife Goals ■ Design an experiment that identifies physical changes and chemical changes in fruit. ■ Observe whether chemical changes can be controlled. Safety Precautions WARNING: Be careful when working with sharp objects. Always keep hands away from sharp blades. Never eat anything in the laboratory. Test Your Hypothesis Make a Plan 1. As a group, agree upon the hypothesis and decide how you will test it. Identify what results will confirm the hypothesis. 2. List each of the steps you will need in order to test your hypothesis. Be specific. Describe exactly what you will do in each step. List all of your materials. 3. Prepare a data table on a separate sheet of paper or on a computer for your observations. 4. Read the entire investigation to make sure all steps are in logical order. 5. Identify all constants, variables, and controls of the experiment. Follow Your Plan 1. Ask your teacher to approve your plan and choice of constants, variables, and controls before you start. 2. Perform the investigation as planned. 3. While doing the investigation, record your observations and complete the data table you prepared. Matter and Its Changes 7
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Chapter 3 Resource: Matter and its Changes

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