Key stage 3 density lesson

1. Density
Lesson Objectives
• Describe the three
states of matter in
terms of particles.
• Describe what
density it and ways
to change it.
• Calculate density
using a formula.
Starter: Draw what you think the
particles look like in a solid, liquid and
gas.
HINT: Use circles like this for particles:
Extension: How do the particle in each
state move?

2. Solid
(Ice)
Liquid
(Water)
Gas
(Steam)
Particles in a Solid, Liquid and Gas
Draw the diagrams in your books.
Describe how the particles are arranged
and how they move for each state.
Fast Slow

3. Density is the amount of mass in a volume.
It tells us how tightly matter is packed together.
What is density?
Which object would be more dense? Why?
What is density?

4. A volunteer with steady hands please!
https://www.youtube.com/watch?v=-CDkJuo_LYs

5. Which object would float, why?

6. You can make an object
more dense by increasing
the mass, but keeping
the volume the same.
Use the diagrams to describe 2 ways of making
something more dense:
You can make an
object more dense by
decreasing the volume.

7. Pick a worksheet: Red is easiest and Green hardest.

8. The formula!
What is mass measured in?
What is volume measured in?
What is density measured in?
Kg
m3
Kg/m3

9. Is this real? If not, how is he doing it?
https://www.youtube.com/watch?v=_4HdMWBXZ3Y

10. Calculations-
1. A piece of steel has a
volume of 12 cm3 and a
mass of 96g. What is its
density?
2. The density of hard wood
is 0.78 g/cm3. What is the
mass of 13 cm3?
3. The density of gold is 19
g/cm3. What is the volume
of 95 g of gold?
Density

12. Density, Mass and Volume
Bronze Activity
7
4
1
8
5
2
9
6
3A butter block weights 200 g.
The dimensions are 8 cm by 5
cm by 6cm. What is its density
(to 3dp)?
A shipping container weights
100kg. The dimensions are 5
metres by 5 metres by 8
metres. What is the density?
A sculpture is made of bronze
(density 8.5 g/cm3). It
measures 2cm x 2cm x 147 cm.
Find its mass (in kg).
Olympic medals have a
diameter of 6cm and a
thickness of 1cm.
Gold has a density of
19g/cm3. Work out
mass of a gold medal
(to 2 dp).
Lead has a density of 11.5g/cm3.
A rectangular block of lead
measures 4cm × 5cm × 2cm.
Find the mass.
A wooden cube has lengths 8cm.
It has a mass of 307.2g. Find
the density of the cube.
0.833g/cm3
0.5kg/m3 4.998kg
12.5kg/m3
460g 0.6g/cm3
2.709kg 537.21g
1728kg
Lead has a density of 11.5g/cm3.
A cylindrical block of led has a
radius of 5 cm and a height of
3cm. Find the mass (in kg
correct to 3 dp).
WILF
Calculate density or mass when
information is given in the SAME unit.
Calculate the density in kg/m3.
The density of
concrete is
2400kg/m3. How
much will the
step weigh?
What does
success
look like?