Practice Density in Chemistry

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

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Quick Recap

The mass of a substance per unit volume, measuring how tightly packed the particles are within a material.

Density answers 'how heavy is this for its size?' A small lead ball is heavier than a large foam ball — lead is denser.

Showing a random 20 of 50 problems.

Example 1

easy
Object A has density 8 g/cm³; object B has density 2 g/cm³. Which is denser?

Example 2

hard
A goldsmith claims a ring is pure gold (d = 19.3 g/cm3^3). The ring weighs 9.65 g and displaces 0.65 mL of water. Is it pure gold?

Example 3

medium
A gas has density 1.25 g/L. What is the mass of 8 L of this gas?

Example 4

medium
Density of an unknown liquid is 0.80 g/mL. What volume holds 200 g?

Example 5

medium
Two metals: aluminum (2.7 g/cm³) and iron (7.9 g/cm³). Equal volumes of each are taken. Which has more mass and why?

Example 6

challenge
A hollow steel ball (steel density 7.9 g/cm³) has total volume 100 cm³ and total mass 80 g. Explain how it can float on water and find its average density.

Example 7

hard
A solid cube has a side length of 3.0 cm3.0 \text{ cm} and a mass of 81 g81 \text{ g}. Calculate its density. If the cube is cut in half, what is the density of each piece? Explain.

Example 8

easy
Cutting a gold bar in half changes its mass and volume. Does its density change?

Example 9

challenge
An object weighs 80 g in air. When fully submerged, it displaces 40 cm³ of water (density 1 g/cm³). Determine its density and predict whether it floats.

Example 10

medium
A piece of metal has a mass of 78.078.0 g. When placed in a graduated cylinder containing 25.0 mL25.0\,\text{mL} of water, the water level rises to 35.0 mL35.0\,\text{mL}. Calculate the density and identify the metal if possible. (Iron = 7.87 g/cm37.87\,\text{g/cm}^3, Copper = 8.96 g/cm38.96\,\text{g/cm}^3, Zinc = 7.13 g/cm37.13\,\text{g/cm}^3)

Example 11

easy
A sample has mass 50 g and volume 10 cm³. Find its density.

Example 12

medium
If two materials have equal mass but A has greater density than B, then A's volume is ____ B's.

Example 13

easy
Will an object with density 0.85 g/cm30.85\,\text{g/cm}^3 float or sink in water (ρ=1.00 g/cm3\rho = 1.00\,\text{g/cm}^3)?

Example 14

easy
A liquid has density 2 g/mL. Find the volume of 80 g of it.

Example 15

easy
If a metal cube has mass 100 g and volume 25 cm³, what is its density?

Example 16

easy
A 90 g object has volume 30 cm3^3. Find its density.

Example 17

medium
A gas occupies 5.00 L and has mass 8.95 g. Find its density in g/L. Does it likely float or sink in air (air density ~1.20 g/L)?

Example 18

easy
A block of aluminum has a mass of 135135 g and a volume of 50.0 cm350.0\,\text{cm}^3. Calculate its density.

Example 19

easy
Will oil (density 0.92 g/mL) float on water (1.00 g/mL)?

Example 20

medium
An irregular metal piece has mass 270 g and, by displacement, a volume of 100 cm³. Could it be aluminum (density 2.7 g/cm³)? Show your reasoning.
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