Density Practice Problems! + Rubber Duck --Just practice problems, NOT a study guide!

device used to determine liquid volumes

graduated cylinder

A loaf of bread has a mass of 500 g and volume of 2500 cm^3. What is the density of the bread?

0.2 g/cm^3

A block of wood has a mass of 6.0 g and a volume of 12.0 cm^3. What is the density of the block of wood?

0.5 g/cm^3

A block of wood is 3 cm on each side and has a mass of 27 g. What is the density of the block? (Hint: Don't forget to find the volume of the wood.)

1 g/cm^3

The density of a substance is 4.0 g/cm^3. If a sample of the substance has a volume of 25 cm^3, then what is its mass? (Hint: Use the equation: mass = density × volume.)

100 g

A rock has a mass of 77.0 grams. The volume is found using water displacement. The initial volume of water is 10.0 mL and the volume of the rock and water is 17.0 mL. Determine the rock's density

11.0 grams/cm^3

A cube is 5 cm on each side. What is the volume of the cube?

125 cm^3

What is the total volume of an object that had an initial volume of 30 mL and a final volume of 45 mL?

15 mL

A student has a rectangular block. It is 2 cm wide, 3 cm tall, and 25 cm long. It has a mass of 600 g. Calculate the volume of the block:

150 cm^3

Find the mass of a piece of gold that has a volume of 3.0 cm^3. The density of gold is 6.0 g/cm^3.

18.0 g

A student has a rectangular block. It is 2 cm wide, 3 cm tall, and 25 cm long. It has a mass of 600 g. What is the density of the block?

4 g/cm^3

A student has a sample of aluminum that has a mass of 27 g and a volume of 10 cm^3. What is the density of aluminum?

2.7 g/cm^3

D = 7g/cm^3, V = 3 cm^3 M = ?

21 g

You have a lead ball with a mass of 420 g. The density of lead is 10.5 g/cm^3. What is the volume of the ball? (Hint: Use the equation: volume = mass/density.)

40 cm^3

The object's dimensions are 10.0 cm x 2.0 cm x 2.0 cm. Calculate the object's volume.

40 cm^3 .

An object has a mass of 100.0 grams. The object's volume is 20.0 cubic centimeters. What is the object's density

5.0 grams/cm^3

M = 48g, V = 8cm^3 D = ?

6 g/cm^3

What is the total volume of an object that had an initial volume of 20 mL and a final volume of 27 mL?

7 mL

Used to measure the mass of an object in grams

Triple Beam Balance

rubber duck prob

When placed in water, a rubber duck has a low weight compared to its volume, so therefore it has a low density. The buoyant force acting on the object is greater than gravity, so the object floats. The object displaces the water equal to its weight, which isn't much because the duck weighs very little. Therefore the duck is positively buoyant because it floats.