The mass of an unidentified rock is 15.5 grams. Students determine the volume of the rock by placing the rock in a cylinder with
water. The students calculate the density of the rock. They determine the identity of the rock based on the density ranges in the table. Rock Density Ranges
Rock Density Range
(g/cm3)
Coal 1.1-1.4
Dolomite 2.8-2.9
Peridotite 3.1-3.4
Sandstone 2.2-2.7
Phosphoric acid. Also known as orthophosphoric acid in or phosphoric(V) acid, is a weak acid with the chemical formula H3PO4. The pure compound is a colorless solid.
