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Understanding Density (Grade 7)

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Understanding Density

Density is a chemical property.
  1. True
  2. False
The density of wood is lower than water. Wood sinks in water.
  1. True
  2. False
The density of water is 1 gram per cubic centimeter and the density of ice is 0.8 grams per cubic centimeter. Which of the following is true?
  1. water floats on ice
  2. ice floats on water
According to the formula, Density = Mass / Volume, what happens to density when volume increases and mass remains the same?
  1. density increases
  2. density decreases
  3. density stays the same
Oil floats on water because
  1. oil is less dense than water.
  2. oil is more dense than water.
  3. oil and water have the same density.
  4. both water and oil are liquids.
Mrs. B sets up two beakers that contain the same amount of water. She has two blocks of different materials that she labels "A" and "B." She places one block in each beaker. Block A sinks and Block B floats. Why?
  1. Block A has a lower density than the water.
  2. Block B has a higher density than Block A.
  3. Block A has a higher density than the water.
  4. Block A has a density equal to Block B.
Imagine an elevator crowded with too many passengers for such a small space. This situation would be a good analogy for a substance with what property?
  1. A very high temperature
  2. A very low density
  3. A very low velocity
  4. A very low temperature
  5. A very high density
Which item would float in water? Water has a density of 1.00 gram per cubic centimeter.
  1. Aluminum - 2.64 grams per cubic centimeter
  2. Pure Gold - 19.24 grams per cubic centimeter
  3. Iron 7.21 - grams per cubic centimeter
  4. Cork 0.24 - gram per cubic centimeter
A geologist finds a rock and breaks it into two pieces to examine the crystals inside. The two pieces of the rock are then labeled Sample A and Sample B. Sample A is twice as large as Sample B. Which of the following statements is true?
  1. Sample A is denser than Sample B.
  2. Sample B is denser than Sample A.
  3. Sample A and Sample B have the same density.
  4. Sample A and Sample B are both less dense than the original rock.
In science lab, you are given the four substances listed below with their densities:

Honey [math]1.42g//cm^3[/math]
Olive oil [math]0.90g//cm^3[/math]
Water [math]1.00g//cm^3[/math]
Ethyl alcohol [math]0.81g//cm^3[/math]

You are asked to combine all four substances in a beaker and observe how they separate. Which correctly lists the order in which the four liquids separate, starting with the one on top to the one on the bottom of the beaker?
  1. Ethyl alcohol, Olive oil, Water, Honey
  2. Honey, Water, Olive oil, Ethyl alcohol
  3. Water, Ethyl alcohol, Honey, Olive oil
  4. Olive oil, Honey, Ethyl alcohol, Water
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