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1. According to the picture, which is the least dense?
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A. the chess piece
B. the toy soldier
C. the liquid in the container
D. There is no way to tell.
Correct Answer: A — the chess piece
Explanation: If an object floats, it is less dense than the liquid. The chess piece is the only
object that floats, so the chess piece must be less dense than the liquid in the beaker. The
soldier has sank to the bottom, so it is denser than the liquid in the container.
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2. Fill in the blank: The greater the amount of matter that is packed into a given space, the
greater the _______________________.
o A. mass
o B. density
o C. volume
o D. temperature
Correct Answer: B — density
Explanation: The definition of density is the amount of matter in a certain space. Mass is
the amount of matter in an object, but it is not dependent upon volume.
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3. What property is being measured in the image below?
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A. mass
B. density
C. volume
D. height
Correct Answer: C — volume
Explanation: The chess piece is submerged in water. The amount the water level rises
shows the volume of the chess piece. In this case the volume of the chess piece is 80 mL.
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4. What is the density of a block with a mass of 36 g and a volume of 9 mL?
o A. 45 g/mL
o B. 27 g/mL
o C. 4 g/mL
o D. 0.25 g/mL
Correct Answer: C — 4 g/mL
Explanation: Density is the amount of mass in a given volume. To calculate density,
divide the mass by the volume. So density = 36 g / 9 mL. This gives you density = 4
g/mL.
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5. The image below shows the same egg in water (on the left) and in seawater (on the right).
What must be true about these liquids?
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A. The seawater is less dense than the plain water.
B. The seawater is denser than the plain water.
C. The plain water and the seawater have equal densities.
D. It is impossible to tell which liquid is denser.
Correct Answer: B — The seawater is denser than the plain water.
Explanation: The egg sinks in plain water, so the plain water must be less dense than the
egg. The egg floats in seawater, so the seawater must be denser than the egg. Put those
two facts together, and the seawater must be denser than the plain water.
This student answered this question incorrectly; student's answer was A.