VLab: Density: Answers - Ms. Mc.'s AP CHEMISTRY SITE



VLab: Density: Answers

Use this to check your work. Remember that while the numerical answers may vary slightly, it is the process used to get those answers that is important.

So, check your process!

Data & Observations

|Table 1: Data for Objects 1-4 |

|Object # |Mass |Initial volume|Final volume |Object volume |

| |(g) |(mL) |(mL) |(mL) |

|1 |24.7 |5.0 |14.5 |9.5 |

|2 |15.6 |5.0 |11.0 |6.0 |

|3 |49.4 |5.0 |24.0 |19.0 |

|4 |5.2 |5.0 |7.0 |2.0 |

|Table 2: Data for Objects 5-11 |

|Object # |Mass |Initial |Final |Object |Density |RESULTS |

| |(g) |volume |volume |volume |(g/mL) |(S = sinks; F = floats) |

| | |(mL) |(mL) |(mL) | | |

| | |

|#6 |gold |

|#7 |lead |

|#8 |aluminum |

|#9 |iron |

|#10 |copper |

|#11 |wood |

1.

|The objects should separate according to their densities. |GASOLINE |

|Aluminum will sink to the bottom, since it is denser than any |wood |

|of the liquids. Ice will sink in the ethanol, but float above | |

|the water. Wood sinks in the gasoline, but floats above the |ETHANOL |

|ethanol. The order of densities is indicated below: |ice |

| | |

|aluminum > seawater > water > ice > ethanol > wood > gasoline |WATER |

| | |

| |SEAWATER |

| |aluminum |

| | |

2. The calculated density of the crown is 12.6 g/mL (56.7 g/4.5 mL), which rounds off to 13 g/mL. This value indicates that the crown CANNOT be made of pure gold, which has a density of 19.3 g/mL. The crown could be made of lead (density = 11.3 g/mL) and plated with a layer of gold. The resulting crown would be expected to have a density between that of lead and gold, but much closer to that of lead. A density value of 13 g/mL supports this hypothesis.

3. d

4. a

5. c

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