1. Density Density: the ratio of the mass of an object to its volume.=
mass
volume
Density is an intensive property that depends only on the composition of a substance, not on the size of the sample.

2. Density
A 10.0 cm3 piece of lead has a mass of 114 g. What is the density of lead?

3. Density Water is an exception
The density of a substance generally decreases as its temperature increases.
Water is an exception
Does that mean it is expanding or shrinking if the density is decreasing?
expanding

4. Density Problems
A copper penny has a mass of 3.1 g and a volume of 0.35 cm3. What is the density of copper?

5. Density Problems
A student finds a shiny piece of metal that she thinks is aluminum. In the lab, she determines that the metal has a volume of 245 cm3 and a mass of 612 g. Calculate the density. Is the metal aluminum?

6. Use Dimensional Analysis
14.8 g of boron to cm3 of boron. The density of boron is 2.34 g/cm3.

7. Use Dimensional Analysis
What is the volume of a pure silver coin that has a mass of 14 g? The density of silver is 10.5 g/cm3.

8. Use Dimensional Analysis
10 mL of mercury to g of mercury. The density of mercury is 13.5 g/mL.

9. Density is Directly Proportional
As the value of one variable increases, the other must also increase
As the value of one variable decreases, the other must also decrease
The graph of a direct proportion is a straight line. The slope of the line = density.
mass
volume
Equation for line:
y=mx + b
m = slope (density)
b = y intercept

10. Error = experimental value - accepted value
Determining Error
Accepted Value: the correct value based on reliable references
Experimental Value: the value measured in the lab
Error = experimental value - accepted value
Percent Error = [error] x 100
accepted value