Presentation on theme: "Density is the ratio of the mass of an object to its volume."— Presentation transcript:
1 Density is the ratio of the mass of an object to its volume. 3.4Determining DensityDensity is the ratio of the mass of an object to its volume.
2 3.4Determining DensityDensity is an intensive property that depends only on the composition of a substance, not on the size of the sample.
3 So, the density for a given substance defines the relationship between mass and volume Like any relationship, it gives you 2 conversion factorsFor gold,19.3 g/cm3 and 1 cm3/19.3 g
4 3.4Determining DensityThe density of corn oil is less than the density of corn syrup. For that reason, the oil floats on top of the syrup.Because of differences in density, corn oil floats on top of corn syrup.
5 46A student finds a shiny piece of metal that she thinks is aluminum. In the lab, she determines the metal has a volume of 245 cm3 and a mass of 612 g. Is this metal aluminum?
6 Well, we can find the density of the material and compare it to the density in the table for aluminum and see if they match.612 g = g245 cm cm3From the table, the density of aluminum is 2.70 g/cm3, so no the metal is not pure aluminum
7 Density and Temperature 3.4Density and TemperatureExperiments 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.
8 for Sample Problem 3.10Problem Solving 3.47 Solve Problem 47 with the help of an interactive guided tutorial.