Chapter 3 Resource: Matter and its Changes

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Name Date Class (continued) Hands-On Activities Analyze Your Data 1. Compare and contrast the changes you observe in the control and the test fruit. 2. Compare your results with those of other groups. 3. What was your control in this investigation 4. What are your variables 5. Did you encounter any problems carrying out the investigation 6. Do you have any suggestions for changes in a future investigation Conclude and Apply 1. Did the results support your hypothesis Explain. 2. Describe what effect refrigerating the two salads would have on the fruit. 3. What will you do with the fruit from this experiment Could it be eaten Communicating Your Data Write a page for an illustrated cookbook explaining the benefits you found in this experiment. Include drawings and a step-by-step procedure. For more help, refer to the Science Skill Handbook. Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 8 Matter and Its Changes
Name Date Class Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. 1 Density of Solids Suppose you cut a piece of copper rod into sections of equal volume. If each section of rod had a volume of 1 cm 3 ,you would find that all the pieces would have the same mass when massed on a balance. That is, the mass of a unit volume of material is the same for all samples of a substance, but usually differs for different substances. The mass of a unit volume, or density, is therefore a characteristic physical property of a substance. How can you determine whether several samples that share other similar physical properties are made of the same substance One way is to determine the densities of the samples. Strategy You will measure the mass and volume of several samples of solids. You will calculate the density of each solid. You will determine if any of the samples are made of the same substance. You will identify samples based on their densities. Materials sheets of paper (2) metal blocks (3) balance metric ruler small rocks (2) 50-mL graduated cylinder water Procedure 1. Place the three blocks on a sheet of paper. On the paper, make a circle around each block. Label one circle A, label another circle B, and a third circle C, as shown in Figure 1. Take only one block off the paper at a time. Keep the other blocks in their circles so you don’t get them mixed up. Figure 1 Laboratory Activity A B C 2. Use a balance to measure the mass of each block to the nearest 0.1 gram. Record the masses in Table 1. 3. Measure the dimensions of each of the three blocks as accurately as you can. Record the dimensions in the table. 4. Calculate the volume of each block by multiplying length, width, and height. Record the volumes in the table. 5. Calculate the density of each block by dividing the mass by the volume. Record the density of each block in the table. 6. Place the two rocks on another sheet of paper. On the paper, make a circle around each rock. Label one circle A and label the other circle B. Take only one rock off the paper at a time. Keep the other rock in its circle so you don’t get them mixed up. 7. Use the balance to measure the masses of each rock sample. Record the masses in Table 2. Hands-On Activities Matter and Its Changes 9
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Chapter 3 Resource: Matter and its Changes

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