1. Density D= Mass_ Volume Mass: put matter on balance Volume:
- graduated cylinder
- geometry volume formulas
- displacement

2. Volume by Displacement

3. Example
An unknown mineral has a mass of 16 grams. A graduated cylinder is filled with 10. mL of water. The mineral is dropped into the cylinder and the water level rises to 18 mL. What is the density of the mineral?

4. Accuracy versus Precision
Now, you draw accurate but not precise:

5. Examples The accepted value is 29.35. Describe the data
below in terms of accuracy and precision.
Trial
Measurement 1
29.48 2
28.97 3
29.27

6. % Error
% error = | experimental – accepted|
accepted
X 100 =

7. Example
A student calculates the density of iron as 6.80 g/cm3 by using lab data for mass and volume. A handbook reveals that the correct value is 7.86 g/cm3. What is the percent error?