Density and other clues that identify a substance
Grade 8 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
A copper cube has a density of 8.96 g/cm³ and a volume of 5 cm³. What is its mass, Ari?
An aluminum bar has a density of 2.7 g/cm³ and a volume of 12 cm³. What is its mass, Bo?
Jun says bigger objects sink and smaller ones float. Agree or disagree?
- Disagree: objects float whatever they are made of
- Agree: big things are heavy
- Disagree: a big log floats, a small nail sinks
- Agree: big things get denser
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
Luz says a big gold bar is denser than a small piece cut from it. Agree or disagree?
- Agree: bigger pieces get denser
- Disagree: both are gold, about 19.3 g/cm³
- Disagree: the small piece is denser
- Agree: the bar is heavier
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 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 in oil
- Oak; it sinks, since wood is heavy
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?
- Sea water; the oak floats
- Sea water; the oak sinks
- Olive oil; the oak floats
- Fresh water; the oak floats
Why does a giant iceberg float, Ren?
- Wind holds it up
- Big things float better
- It is hollow inside
- It is less dense than the water
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
- Almost no part; ice sits on top
- About half
A test ball has a density of 1.02 g/cm³. Sea water is about 1.025 g/cm³. Where does it float, Zee?
- In fresh water but not sea water
- In sea water but not fresh water
- In neither, since it is heavy
- In both, since it is a ball