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

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

Level: Building Confidence · On Level · Challenge Me

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Density and other clues that identify a substance

Grade 8 Science Worksheet - Building Confidence

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

  1. An aluminum block has a mass of 27 g and a volume of 10 cm³. Density = mass ÷ volume. What is its density, Ari?

  2. An iron bolt has a mass of 39.35 g and a volume of 5 cm³. Density = mass ÷ volume. What is its density, Esme?

  3. Read this first

    Density reference table (real data, rounded; NIST and Engineering ToolBox) (real data, rounded)

    substancedensity (g/cm³)
    cork0.2 to 0.25
    oak wood0.72
    olive oil0.91
    ice0.92
    corn oil0.92
    water1
    sea water1.025
    aluminum2.7
    zinc7.13
    iron7.87
    copper8.96
    silver10.5
    gold19.3

  4. Jun drops a big cork into water. Using the table, does it float or sink?

    • It floats
    • It dissolves
    • It sinks, since it is big

  5. Kira drops a tiny iron nail into water. Using the table, what happens?

    • It sinks
    • It floats, since it is light
    • It floats, since it is small

  6. An iceberg can weigh millions of kilograms. Using the table, does it float in water, Luz?

    • It sinks, since it is so heavy
    • It floats
    • It sinks to the sea floor

  7. Milo has a big aluminum block and a small aluminum block. How do their densities compare?

    • The big one is denser
    • The big one, since it has more mass
    • The same

  8. Noah compares a small solid copper bead and a big solid copper block. Which is denser?

    • Neither; they are the same
    • The block, since it is heavier
    • The bead, since it is small

  9. Pia cuts a bar of soap in half. How does each half's density compare with the whole bar's?

    • The same
    • Each half is half as dense
    • Less, since each half has less mass

  10. Density reference table (real data, rounded; NIST and Engineering ToolBox) (real data, rounded)

    substancedensity (g/cm³)
    cork0.2 to 0.25
    oak wood0.72
    olive oil0.91
    ice0.92
    corn oil0.92
    water1
    sea water1.025
    aluminum2.7
    zinc7.13
    iron7.87
    copper8.96
    silver10.5
    gold19.3

  11. A metal has a density of 8.96 g/cm³. Using the table, which metal is it, Ren?

    • Iron
    • Silver
    • Copper

  12. A block of wood has a density of 0.72 g/cm³. Using the table, which material matches, Zee?

    • Cork
    • Oak wood
    • Ice
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8th grade Density and other clues that identify a substance worksheet – printable
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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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