Physical Science 8th grade (1).pdf

Record the result in your data table 6 use the

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Record the result in your data table. 6. Use the displacement method to find the volume of the object in cubic centimeters. 7. Calculate the density of the object in grams per cubic centimeter. 8. Repeat steps 3-7 using the other objects. Applying your knowledge a. Explain how you found the volume of the various objects you tested. b. List the objects in order of density, starting with the least dense material. Circle each object that floats. c. What is the pattern between the density of an object and the ability of the object to sink or float? d. Suppose you were to do this experiment using other liquids instead of water. Which of the objects would float in each of the liquids listed below? Explain how you found your answer. Description of object Prediction: Sink or float? Result: Sink or float? Mass (g) Volume (cm 3 ) Density (g/cm 3 ) water X X 50 Liquid Density (g/cm 3 ) corn syrup 1.4 mercury 13.6 cooking oil 0.91 Chapter 4 Activity
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C HAPTER 4 D ENSITY AND B UOYANCY 91 Chapter 4 Assessment Vocabulary Select the correct term to complete the sentences. Section 4.1 1. The mass of matter per unit of volume is known as ____. Section 4.2 2. The upward force exerted by a fluid on an object submerged in the fluid is called ____. 3. The idea that the buoyant force exerted on an object is equal to the weight of the fluid displaced by the object is known as ____. 4. The force exerted on an object by the gravity of Earth is called ____. Concepts Section 4.1 1. Which has a greater weight, 1.0 gram of steel or 1.0 gram of aluminum? 2. Which has a greater density, 1.0 gram of steel or 1.0 kilogram of aluminum? 3. Which has a greater volume, 1.0 gram of steel or 1.0 gram of aluminum? 4. Name three units that can be used to represent density. 5. When comparing solids, liquids, and gases: a. Which phase generally has the greatest density? b. Which phase has the lowest density? 6. The density of ice is less than the density of water. How does this affect life in a pond over a long, cold winter? 7. Using Table 4.1 on page 75, which material might be used to make an object with a density of 0.60 g/cm 3 ? 8. A glass block has a density of 2.7 g/cm 3 . If the same type of glass was used to make a 2-liter water pitcher, what would be the density of the pitcher? 9. By adding more lead to a bar of lead you: a. increase the bar’s density. b. decrease the bar’s density. c. do not change the bar’s density. 10. If you know the mass and density of a material, how would you find its volume? 11. Based upon the diagram to the right, arrange the three materials, cork, water, and lead in order from most to least dense. 12. A graduated cylinder contains 25 mL of water. An object placed in the cylinder causes the water level to rise to 43 mL. What is the volume of the object? 13. What is the name of the dark, curved “band” at the top of the column of water pictured in the graduated cylinder to the right?
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