3.4 Determining Density • Determining Density • What determines the density of a substance?
3.4 Determining Density • Density is the ratio of the mass of an object to its volume.
3.4 Determining Density • Each of these 10-g samples has a different volume because the densities vary.
3.4 Determining Density • Density is an intensive property that depends only on the composition of a substance, not on the size of the sample.
3.4 Determining Density • The density of corn oil is less than the density of corn syrup. For that reason, the oil floats on top of the syrup.
3.4 Density and Temperature • Density and Temperature • How does a change in temperature affect density?
3.4 Density and Temperature • Experiments show that the volume of most substances increases as the temperature increases. Meanwhile, the mass remains the same. Thus, the density must change. • The density of a substance generally decreases as its temperature increases.
3.4 Section Quiz • 1. If 50.0 mL of corn syrup have a mass of 68.7 g, the density of the corn syrup is • 0.737 g/mL. • 0.727 g/mL. • 1.36 g/mL. • 1.37 g/mL.
3.4 Section Quiz • 2. What is the volume of a pure gold coin that has a mass of 38.6 g? The density of gold is 19.3 g/cm3. • 0.500 cm3 • 2.00 cm3 • 38.6 cm3 • 745 cm3
3.4 Section Quiz • 3. As the temperature increases, the density of most substances • increases. • decreases. • remains the same. • increases at first and then decreases.