15. A student has an unknown substance. The mass of the block is 17 grams. The block
has a length of 2 cm, a width of 5 cm, and a height of 2 cm.
Substance Density
Substance
Lucite
Polyethylene
Glass
Quartz
Density
1.2 g/cm³
0.85 g/cm³
2.3 g/cm³
2.7 g/cm³
The block floats when dropped in a beaker of water. What is the identity of the
substance?