SNC1D1 Density
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Transcript SNC1D1 Density
Density
A quantitative physical property
Density
At the conclusion of our time
together, you should be able to:
1. Define density
2. Calculate the density of a given object if
given the volume and mass
3. Calculate the volume or mass if the density
is given with the volume or mass
Definition
Density is defined as mass per unit
volume
It is the amount of matter within a
certain volume
Density = mass
volume
Units = g/mL (liquid) OR g/cm3 (solid)
Which one is more dense?
Which one is more dense?
►Which is heavier, a kilogram of
feathers or a kilogram of bricks? Neither
►Which takes up more space?
Feathers
►If two objects have the
same mass, the one with the
higher density will take up
less space.
Water has a density of 1.0 g/ml and
mercury (Hg) has a density of 13.6 g/ml.
Which is heavier, a liter of water or a liter of
mercury?
If we have equal volumes of two different
substances, then the one with the greater density
will have the greater mass.
Density Calculations
Example 1:
volume of
A chunk of silver has a mass of 21.0 g and a
2.00 cm3. What is the density of silver?
Set up your density problems as shown on the handout:
Given: m = 21.0 g
V = 2.00 cm3
Required: D
Density Calculations
Example 1:
volume of
A chunk of silver has a mass of 21.0 g and a
2.00 cm3. What is the density of silver?
Analysis: D = m
V
Solution: D = 21.0
2.00 cm3
D = 10.5 g/cm3
Paraphrase: The density of silver is 10.5 g/cm3.
Density Calculations
Example 2:
The density of lead is 11.35 g/cm3. Determine the
mass of a cube of lead with sides 2.5 cm long.
Density Calculations
Example 3:
of
What is the volume of a solid that has a mass
5.00 X 104 mg and a density of 55 g/cm3?
Density Calculations
m
D
V
Cover up whatever unit you are solving for,
the two units remaining will show you how
to solve the problem.
Homework – pg. 25 # 1 – 5
Let’s see if you can:
1. Define density
2. Calculate the density of a given object if
given the volume and mass
3. Calculate the volume or mass if the density
is given with the volume or mass