# Lesson Worksheet: Matter and Density Science

In this worksheet, we will practice defining density, calculating the density of a substance, and predicting whether it will float or sink in water.

Q1:

Which of the following statements best defines the density of a substance?

• AThe mass per unit volume of a substance
• BThe area per unit volume of a substance
• CThe weight per unit mass of a substance
• DThe thickness per unit area of a substance
• EThe hardness per unit volume of a substance

Q2:

Which of the following formulas correctly relates the density of a substance to its mass and volume?

• A
• B
• C
• D

Q3:

The densities of water and a certain oil are given in the image below. An object is found to sink in the oil but float on water. What can be assumed about the density of the object?

• AIts density is exactly 0.95 g/cm3.
• BIts density is less than 0.9 g/cm3 but greater than 1.0 g/cm3.
• CIts density is less than 0.9 g/cm3 and less than 1.0 g/cm3.
• DIts density is greater than 0.9 g/cm3 but less than 1.0 g/cm3.
• EIts density is greater than 0.9 g/cm3 and greater than 1.0 g/cm3.

Q4:

A substance has a mass of 13.5 g and occupies a volume of 5 cm3. What is its density?

Q5:

If a substance has a mass given in units of grams (g) and a volume given in units of cubic centimeters (cm3), what unit will the density of the substance be measured in?

• Ag2⋅cm3
• Bg⋅cm3
• Cg3/cm
• Dcm3/g
• Eg/cm3

Q6:

An unknown liquid is claimed to have a density of 0.79 g/cm3. If this claim is true, what would the mass of 40 cm3 of this liquid be?

Q7:

A student wants to determine the density of a liquid. They first weigh a glass beaker and then add exactly 50 cm3 of the liquid into the beaker. Finally, the glass beaker is weighed again. The student records their measurements in the table shown below. Using this information, what is the density of the liquid to 1 decimal place?

Mass of Empty Glass Beaker (g) Mass of Glass Beaker and Liquid (g)
67 112

Q8:

The image below shows a tank of water into which various objects have been placed. Which of the following statements might explain what is observed?

• AThe ice cube and cork have densities greater than the density of water.
• BThe cork and stone have densities less than the density of water.
• CThe stone and iron nail have densities greater than the density of water.
• DThe piece of wood and iron nail have densities less than the density of water.
• EThe objects all have the same density as water.

Q9:

Balloons filled with hydrogen or helium will rise, but balloons filled with oxygen or chlorine will not. Which statement explains why this happens?

• AHydrogen and oxygen are denser than air, but helium and chlorine are less dense than air.
• BHydrogen and helium are less dense than air, but oxygen and chlorine are denser than air.
• CHelium and oxygen are denser than air, but hydrogen and chlorine are less dense than air.
• DHydrogen and helium are denser than air, but oxygen and chlorine are less dense than air.
• EHydrogen and oxygen are less dense than air, but helium and chlorine are denser than air.

Q10:

The diagram below shows a series of beakers containing different liquids as well as the densities of these liquids. A small sample of lithium has a density of 0.5 g/cm3. Will the sample sink or float when placed in beaker B?

• AFloat
• BSink

This lesson includes 37 additional questions and 40 additional question variations for subscribers.