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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 - Challenge Me

NameDate

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

  1. A copper cube has a density of 8.96 g/cm³ and a volume of 5 cm³. What is its mass, Ari?

  2. An aluminum bar has a density of 2.7 g/cm³ and a volume of 12 cm³. What is its mass, Bo?

  3. Jun says bigger objects sink and smaller ones float. Agree or disagree?

    • Agree: big things get denser
    • Disagree: a big log floats, a small nail sinks
    • Disagree: objects float whatever they are made of
    • Agree: big things are heavy

  4. Kira says ice floats because ice is light. What is the better reason?

    • Ice is less dense than water
    • Cold things float
    • Ice cubes are small
    • Ice weighs nothing

  5. Luz says a big gold bar is denser than a small piece cut from it. Agree or disagree?

    • Agree: bigger pieces get denser
    • Disagree: the small piece is denser
    • Disagree: both are gold, about 19.3 g/cm³
    • Agree: the bar is heavier

  6. 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

  7. A wood sample has a mass of 18 g and a volume of 25 cm³. Using the table, what is it, and does it float in water and in corn oil, Milo?

    • Oak; it floats on water and on oil
    • Ice; it floats on water
    • Oak; it sinks, since wood is heavy
    • Oak; it sinks in oil

  8. A metal sample has a mass of 71.3 g and a volume of 10 cm³. Using the table, what is it, and what does it do in water, Noah?

    • Aluminum; it sinks
    • Zinc; it floats, since it is small
    • Zinc; it sinks in water
    • Iron; it sinks

  9. A liquid sample has a mass of 102.5 g and a volume of 100 cm³. Using the table, what is it, and what does an oak block do in it, Pia?

    • Olive oil; the oak floats
    • Sea water; the oak floats
    • Sea water; the oak sinks
    • Fresh water; the oak floats

  10. Why does a giant iceberg float, Ren?

    • Wind holds it up
    • It is less dense than the water
    • It is hollow inside
    • Big things float better

  11. Ice (0.92 g/cm³) floats in fresh water (1.00 g/cm³). About how much of a floating ice cube is underwater, Tala?

    • About a tenth
    • About nine tenths
    • About half
    • Almost no part; ice sits on top
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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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