1. The accepted densities are shown in the table below. If the calculated values by you are 2.9 g/cm3 for Aluminum, 1.0 g/cm3 for Acrylic, and 1.1 g/cm3 for Polyethylene, respectively, how do these numbers compare to the calculated values? What sources of error could cause the differences? Substance Density (g/cm3) Aluminum 2.7 Acrylic 1.2 Polyethylene 0.9 2. People float in saltwater more easily than they do in freshwater. Likewise, some objects that sink in freshwater will float in saltwater. Based on these facts, what can be inferred about the density of saltwater and the density of freshwater? Explain the conclusion. 3. When ice melts in a glass of regular soda without being disturbed, the following observations can be made: (1) the ice floats in the soda, (2) water from melted ice remains above the soda, and (3) the ice floats in the water. What can be inferred about the relative densities of ice, water, and regular soda? 4. A crude oil spill from a deep-water drilling platform is always possible. The density of crude oil ranges from 0.8 g/cm3 to 0.9 g/cm3. How might the density of crude oil affect its impact on wildlife, both aquatic and terrestrial? How might its density affect clean-up operations? How might the density of crude oil affect potential fires?