Chapter 2
Sections 2.5 and 2.8
SI Prefixes
Examples:
kilo means 1000, centi 100, deci 10, etc.

Refer to the “Metric Prefixes” chart in your
note packet
Derived SI units
Combinations of SI base units form derived
units
 derived units are produced by multiplying
or dividing standard units
Area
 What is the SI unit for area??
Hint: area = length x width
m x m = m2
Volume
 What is the SI derived unit for volume?
Hint: volume = length x width x height
m x m x m = m3

volumes of liquids and gases are often
measured using liters (L)
1 Liter = 1000 cm3
 1 mL = 1 cm3

Density: the ratio of mass to volume (how
massive an object is compared with its
size)


density =
mass
volume
or
d= m
v
What are some units for density?
kg/m3, g/cm3, g/mL, g/L
Density Examples
1. A sample of aluminum metal has a mass
of 8.4 g. The volume of the sample is 3.1
cm3. Calculate the density of aluminum.
Solution:
d =m/v
= 8.4g / 3.1cm3
= 2.7g/cm3
2. Diamond has a density of 3.26 g/ cm3.
What is the mass of a diamond that has a
volume of 0.350 cm3?
Solution:
d =
m =
=
=
m/v
dxv
3.26g/cm3 x 0.350cm3
1.14g
3. What is the volume of a sample of liquid
mercury that has a mass of 76.2 g, given that
the density of mercury is 13.6 g/mL?
Solution:
d =
v =
=
m/v
m/d
76.2g
13.6g/mL
=
5.60mL