Graphing the Density of Lead
The relationship between two measurements can be shown on a graph. Density is the relationship between mass and volume. It is a measure of how much matter (mass) is packed into a certain amount of space (volume). The density of a substance doesn't change with sample size. If you have more of it (mass), it has to take up more space (volume). To calculate the density of a substance divide the mass by the volume. Typical units are: g/ml or g/cm3. Here is an example:
mass of gold sample 38.6 g Density of gold = -------------------- = ------- = 19.3 g/cm^3 volume of gold sample 2.0 cm^3
|Sample Number||Mass (g)||Volume (ml)|
- Describe in words the equation used to determine the density of an object.
- What is the density of sample number 3? Show your work.
- What is the density of sample number 7? Show your work
- Use the graph to find the volume of a lead sample with a 120 g mass.
- For a sample of lead with a volume of 14 ml, use the graph to find its mass.
- Describe how you can use your graph to find the volume of a sample if you only know its mass?
- Why doesn't every data point lie exactly on the line of your graph?
- Algebra bonus: What is the slope of the lead density line? Be sure to include the appropriate units.