Density Chemistry Mrs. Coyle
Density Density= Mass Volume D= m V
Mass • Mass: Amount of matter in a substance. • Don’t confuse with weight. • Weight: the force with which the earth pulls on the substance.
Question Which weighs more? 50 kilograms of iron Or 50 kilograms of feathers
Question Which has a greater density? iron Or feathers
Common Units of Density Density= Mass Volume g/mL = g/cm3 kg/m3 1 cm3=1 mL 1 dm3=1L
Density as a Function of Temperature For most substances, as temperature increases the volume increases and as a result the density decreases.
Density of Water At 4oC water has its maximum density of 1g/cm3 Convert to kg/m3: 1000kg/m3
Note • Density is an intensive physical property. (Does not depend on amount of matter in the sample)