Bell
Work
SPI 0807.9.7
Density
Date
If you do not have your textbook,
go get it before the bell rings!
Write your heading on a blank sheet of paper,
and answer these questions.
(Use your book to help you.)
1) Density is a __________ property that describes the
relationship between ________ & ________ (see p189, last para)
2) Density is the amount of __________ in a given _________ or
_________ (see p189, last para)
3) What is the mathematical formula used to determine density?
(see page 191, top para)
Notes
SPI 0807.9.7
Density
Science
What is density?
 Density is the amount of matter (mass)
you have crammed in a given space (volume)
Reminder: mass is how much matter is in an object
Reminder: volume is how much space it takes up (size)
To compute density
 - divide the mass by the volume of the object
Demonstration:
Demonstrate with wadded up paper in a trash can
SPI 0807.9.7
Density
Notes
Science
Density Example:
 Here are two objects that are the same size.
(1) Bowling Ball and (2) Soccer Ball
 One of these objects contains more matter (bowling ball).
 With two same-sized objects like this, the object with more
mass has greater density than the other object.
More Dense
Less Dense
0807.9.7
Solve The ThreeSPI
Density
Problems Shown Below
Quick
Science
Go
ahead
and
use
a
calculator
(for
now)
Density
Practice
Use this formula: Density=mass divided by volume
or D= M
Density= volume mass
D= M/V
or
V
1) …density of an object with a mass of 25g a volume of 10cm3?
Example: 25 (mass) divided by 10 (volume) Units…
Density= 10 25
g/cm3
2) …density of an object with a mass of 45kg a volume of 43m3?
Example: 45 (mass) divided by 43 (volume) Units…
Density= 43 45
kg/cm3
3) …density of an object with a mass of 350g a volume of 95cm3 ?
Example: 350 (mass) divided by 95 (volume) Units…
g/cm3
Density= 95 350
Notes
Don't
Forget
Your Units!
SPI
0807.9.7
Example: grams/centimeter cubed
Density
Written like this…g/cm3
Science
Density=mass divided by volume
Answers
1) …density of an object with a mass of 25g & volume of 10cm3?
25g ÷ 10cm3 = 2.5g/cm3
2) …density of an object with a mass of 45kg & volume of 43m3?
(round up to the nearest hundredth)
45kg ÷ 43m3 = 1.05kg/m3
3) …density of an object with a mass of 350g & volume of 95cm3 ?
(round up to the nearest hundredth)
350g ÷ 95cm3 = 3.68g/cm3
Density
In Liquids
SPI 0807.9.7
Notes
Science
Lower
density liquids will float on top of liquids with higher
density
Density
Example: Oil floats on top of water
Designation
Substance
Density
Liquid 01
Water
1.0 g/mL
Liquid 02
Liquid Mercury
13.6 g/mL
Liquid 03
Turpentine
0.8 g/mL
1) Identify which liquids would occupy levels A, B, and C
according to their density.
SPI 0807.9.7 (Density)
ANSWERS
Level A Turpentine (0.8 g/mL)
Level B Water (1.0 g/mL)
Level C Mercury (13.6 g/mL)
SPI
Which cube below
has0807.9.7
the GREATEST density?
Notes
Science
Again…go ahead and
use
a
calculator
(for
now)
Density
(B)
(A)
Mass: 12g
Volume: 3cm3
Mass: 19g
Volume: 7cm3
4 g/cm3
2.71 g/cm3
(C)
(D)
Mass: 11g
Volume: 3cm3
Mass: 23g
Volume: 5cm3
3.6 g/cm3
4.6 g/cm3