1. Density

2. What is Density:
Density is a physical property of matter, as each element and compound has a unique density associated with it.
In a qualitative manner, it is defined as the measure of the relative “heaviness” of objects with a constant volume
Density may also refer to how closely “packed” or “crowded” the material appears to be

3. Mathematical Definition:
The formal definition of density is mass per unit of volume
Usually density is expressed in grams per mL or cc
CC is cubic centimeter which is equal to a mL
Per statement is translated to division
Density = mass =   g/mL  
  volume  

4. Density Examples: Example 1:
Calculate the density in g/mL of aluminum if a 50 mL block weighs135 g.
Solution:
Apply the Definition
Density = g = 2.70 g/mL
50 mL

5. Manipulate Density Formula:
Solving for Density:
D = M V
Solving for Mass:
M = V x D
Solving for Volume:
V = M D

6. Density Examples: Example 2:
Iron has a density of 7.87 g/cm3 . What is the mass of 250 cm3 of iron?
Solution:
Apply the Definition
7.87 g/cm3 = _M__ 
250 cm3
7.87 g/cm3 x 250 cm3 = g

7. Your Turn:
1. A piece of metal has a mass of 45.6 grams and a volume of 110 cm3 . What is its
density?
2. Aluminum has a density of 2.70 g/cm3 . What is the mass of a cube of aluminum that measures 9.3 cm on a side?
3. If a block of wood has a density of 0.6g/cm3 and a mass of 120g, what is its volume?
4. If you have a gold brick that is 2cm by 3cm by 4cm and has a density of 19.3g/cm3, what is its mass?
Answers: 1.) 41 g/cm3 2.) g 3.) 200 cm ) g