Activity Sheet Chapter 3, Lesson 1 What is Density?
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1 Activity Sheet Chapter 3, Lesson 1 What is Density? Name Date DEMONSTRATION Your teacher placed a copper and an aluminum cube on a balance. Even though the cubes are the same size and shape, the copper has a greater mass than the aluminum. Both cubes are solid and are not hollowed out anywhere inside. The copper cube is made up of only copper atoms and the aluminum cube is made up of only aluminum atoms. 1. Look at the drawing of the copper and aluminum cubes and their atoms. What are two possible explanations for why the copper cube has a greater mass than the aluminum cube? Hint: Just because the aluminum atoms are larger, they are not necessarily heavier. Explanation 1: Explanation 2: 2. The density of a substance like copper or aluminum is its mass divided by its volume (how much space it takes up). Density = mass/volume or D = m/v. Which is more dense, copper or aluminum? How do you know? 162 Middle School Chemistry Unit 2011 American Chemical Society
2 You saw an animation about how to find the volume, mass, and density of a cube. 3. How do you find the volume of a cube? 4. How do you find the mass of a cube? 5. Once you know the volume and mass of a cube, how do you find the density of the cube? 6. Calculate the density of a cube using the following information: Each side is 4 cm long. The mass of the cube is 128 g American Chemical Society Middle School Chemistry Unit 163
3 ACTIVITY Your group will work with eight cubes each with the same volume, but made of a different material. Carefully measure the mass of each cube and calculate the density. Then use density to correctly identify each of the 8 cubes. Question to investigate Can you use density to identify eight cubes made of different materials? Materials for the class Set of eight cubes of equal volume Calculator Teacher preparation Use a piece of masking tape and a permanent marker to mark the eight cubes with the letters A H. Materials for each group Cubes marked A H that you will share with other groups Balance that can measure in grams Calculator Procedure 1. The volume of each cube is given in the chart. It is 15.6 cm Find the mass in grams of each cube using a scale or balance. Record this mass in the chart. 3. Trade cubes with other groups until you have measured the mass of all eight cubes 4. Calculate the density using the formula D = m/v and record it in the chart. Sample Volume (cm 3 ) Mass (g) Density (g/cm 3 ) Material A 15.6 B 15.6 C 15.6 D 15.6 E 15.6 F 15.6 G 15.6 H Middle School Chemistry Unit 2011 American Chemical Society
4 5. Compare the value you found for density with the given value in the chart below to identify which cube is made out of which material. Write the name of the material in your chart for cubes A H. Material Approximate Density (g/cm 3 ) Aluminum 2.9 Brass 8.8 Copper 9.3 Steel 8.2 PVC 1.3 Nylon 1.2 Oak Pine or poplar EXPLAIN IT WITH ATOMS & MOLECULES 7. The size, mass, and arrangement of atoms affect the density of a substance. If a substance has a high density, what can you guess about the size, mass, and arrangement of the atoms that make up the substance? If a substance has a low density, what can you guess about the size, mass, and arrangement of the atoms that make up the substance? 2011 American Chemical Society Middle School Chemistry Unit 165
5 TAKE IT FURTHER In this activity, you investigated cubes made out of different substances. The cubes had the same volume, but different masses. When you calculated the density of each cube, you found that this was different, too. 8. Now imagine two blocks (Sample A and Sample B) made of different substances that both have the same mass, but different volumes. a. What is the density of Sample A? b. What is the density of Sample B? c. Give two possible explanations for why one sample is more dense than the other. Hint: The size, mass, and arrangement of molecules affect the density of a substance. 166 Middle School Chemistry Unit 2011 American Chemical Society
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