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8th grade Density and other clues that identify a substance worksheet

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Density and other clues that identify a substance

Grade 8 Science Worksheet

NameDate

Circle the best answer, or write your answer on the line.

An ice cube has a mass of 18.4 g and a volume of 20 cm³. What is its density, Ari?
An oak block has a mass of 36 g and a volume of 50 cm³. What is its density, Bo?
Read this first
Density reference table (real data, rounded; NIST and Engineering ToolBox) (real data, rounded)
substance density (g/cm³)
cork 0.2 to 0.25
oak wood 0.72
olive oil 0.91
ice 0.92
corn oil 0.92
water 1
sea water 1.025
aluminum 2.7
zinc 7.13
iron 7.87
copper 8.96
silver 10.5
gold 19.3
3.
A mystery metal has a mass of 54 g and a volume of 20 cm³. Using the table, what is it, Jun?
- Zinc
- Aluminum
- Iron, since it is a heavy block
- Copper
4.
A mystery metal has a mass of 157.4 g and a volume of 20 cm³. Using the table, what is it, Kira?
- Zinc
- Gold, since it is heavy
- Iron
- Copper
5.
A mystery metal has a mass of 105 g and a volume of 10 cm³. Using the table, what is it, Luz?
- Copper
- Iron
- Gold, since it is the heaviest
- Silver
Use this
Jar of two liquids that do not mix (real densities, rounded): water 1.00 g/cm³ and corn oil 0.92 g/cm³, poured in and left to settle.
6.
Milo's class lets the water and corn oil settle. Which liquid ends up on top?
- Corn oil
- Water, since there is more of it
- Neither; they mix evenly
- Whichever was poured in last
7.
Noah drops a small oak block into the jar. Where does it end up?
Use the picture in question 6.
- Floating on top of the corn oil
- At the bottom, since wood is heavy
- At the bottom of the water
- Between the oil and the water
8.
An acrylic plastic bead has a density of 1.19 g/cm³. Where does it settle in the jar, Pia?
Use the picture in question 6.
- On top of the oil, since it is small
- At the bottom, under the water
- Between the oil and the water, since it is light
- On top of the oil, since plastic floats
9.
Ren cuts a copper bar (8.96 g/cm³) in half. What is the density of one half?
- 4.48 g/cm³, half as much
- 8.96 g/cm³
- 17.92 g/cm³
- Less, since a half weighs less
10.
Zee pours half the water out of a glass. What is the density of the water left?
- About 0.50 g/cm³
- About 1.00 g/cm³
- Less, since there is less of it
- About 2.00 g/cm³

substance	density (g/cm³)
cork	0.2 to 0.25
oak wood	0.72
olive oil	0.91
ice	0.92
corn oil	0.92
water	1
sea water	1.025
aluminum	2.7
zinc	7.13
iron	7.87
copper	8.96
silver	10.5
gold	19.3

8th grade Density and other clues that identify a substance worksheet – printable — Print: 1 2 3 4 5 6

About this worksheet

Density and other clues that identify a substance. Every version has 10 questions, and the answer key prints on the second page.

What your child will learn

I can find density = mass ÷ volume in g/cm³, and find mass from density and volume.
I can identify a substance by matching its density with a reference table.
I can say that density does not change when a sample is cut or poured, and that heavy is not the same as dense.
I can predict floating and layering by comparing densities with water (1.00 g/cm³), corn oil and sea water.

Standard: MS-PS1-2 (supporting)

Words to know

density: How much mass is packed into each cubic centimeter

mass: How much matter something has, in grams

volume: How much space something takes up, in cm³

g/cm³: Grams in each cubic centimeter

reference table: A list of measured values to compare with

characteristic property: A property that helps tell one substance from another

Common mistakes

Your child multiplied mass and volume (or divided the wrong way). Density is grams in each cubic centimeter, so divide mass by volume.

Your child thought heavy or big things sink. A huge log floats and a tiny pebble sinks: compare each one's density with water's.

Your child thought cutting or adding more changes density. Cut a piece of soap in half: each half has the same density.

Questions parents ask

What is the most common mistake with density and other clues that identify a substance?

Your child multiplied mass and volume (or divided the wrong way). Density is grams in each cubic centimeter, so divide mass by volume.

Are these 8th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

More grade 8 science

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