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Michal Kreiselman

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Density via Comparison

Using four beakers of liquids with known densities, estimate the density of a variety of objects. Place each object into each beaker to see whether it sinks or floats, and then use this information to compare the densities of the objects.

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Assessment Questions (5):

An object with a density of 0.85 g/cc is dropped into each of the two beakers shown below. What will happen to the object in each case?
- A. It will sink in both beakers.
- B. It will float in Beaker 1 and sink in Beaker 2.
- C. It will sink in Beaker 1 and float in Beaker 2.
- D. It will float in both beakers.
Objects 1 and 2 float as shown in the beaker below. The density of the liquid in the beaker is 3.2 g/cc. Which of the densities given below are possible values for the densities of the two objects?
- A. Density of object 1 = 4.4 g/cc
  Density of object 2 = 4.0 g/cc
- B. Density of object 1 = 3.0 g/cc
  Density of object 2 = 1.8 g/cc
- C. Density of object 1 = 1.6 g/cc
  Density of object 2 = 2.9 g/cc
- D. Density of object 1 = 2.5 g/cc
  Density of object 2 = 3.8 g/cc
Identical objects are placed in Beaker A and in Beaker B. The objects float as shown in the diagrams below. What can you conclude about the liquid in each of the beakers?
- A. Both liquids are less dense than the objects.
- B. The liquid in Beaker A has a greater density than the objects. The liquid in Beaker B is less dense than the objects.
- C. The liquid in Beaker A has a greater density than the liquid in Beaker B.
- D. The liquid in Beaker B has a greater density than the liquid in Beaker A.
Objects 1 and 2 are placed in the beaker below. The density of the liquid in the beaker is 2.0 g/cc. Which of the densities given below are possible values for the densities of the two objects?
- A. Density of object 1 = 0.8 g/cc
  Density of object 2 = 3.0 g/cc
- B. Density of object 1 = 3.0 g/cc
  Density of object 2 = 0.8 g/cc
- C. Density of object 1 = 3.8 g/cc
  Density of object 2 = 3.0 g/cc
- D. Density of object 1 = 1.5 g/cc
  Density of object 2 = 0.8 g/cc
An object with unknown density is tested in two beakers. Beaker 1 contains liquid with a density of 1.5 g/cc, and Beaker 2 contains liquid with a density of 2.0 g/cc. The object sinks in both beakers. Which of the following statements about the object's density is true?
- A. The object's density is less than 1.5 g/cc.
- B. The object's density is exactly 1.5 g/cc.
- C. The object's density is greater than 1.5 g/cc and less than 2.0 g/cc
- D. The object's density is greater than 2.0 g/cc

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