Density

1
Density

• Why some things sink and others float

2
Rainbow Lab
3
Rainbow Lab
Jar Mass of Salt Volume of water Food coloring
1 1.7 g 10 mL Blue
2 1.4 g 10 mL Green
3 1.1 g 10 mL Yellow
4 0.6 g 10 mL 2 Yellow, 1 Red
5 0 g 10 mL Red
4
Rainbow Lab
Jar Mass of Salt Volume of water Food coloring
1 5 g 30 mL Blue
2 4.2 g 30 mL Green
3 3.2 g 30 mL Yellow
4 1.7 g 30 mL 2 Yellow, 1 Red
5 0 g 30 mL Red
5
What if I finish early?

• Calculate the density of the cubes on lab station
  8 using the equation
• Density Mass
• Volume

6
Rainbow Lab Analysis
Red
Orange
Yellow
Green
Blue
7
Density

• How much stuff is in a certain space.

8
MISCONCEPTION ALERT

• Density Weight

9
Which object weighs more?

• Which object is more dense?

Density of water 1.0 g/cm3
Density of gold 19.3 g/cm3
10
Density

• How much matter (mass) is in a certain volume

m
d
V
11
Think about your knowledge of fractions from math
class
Lets see what happens when we change one variable
m
12
If mass gets bigger
40 kilograms
20 kilograms
What happens to density?
and volume stays the same
13
and mass stays the same
20 kilograms
What happens to density?
If volume gets bigger
14
If mass gets bigger
40 kilograms
20 kilograms
and density stays the same
What happens to volume?
15
What happens to mass?
10 kilograms
20 kilograms
If density gets smaller
and volume stays the same
16
Sink or float?
17
Sink or float?
Water has a density of 1.0 g/mL. Therefore, any
object with a density of LESS than 1.0 g/mL will
FLOAT in water. Anything with a density of MORE
than 1.0 g/mL will SINK.
18
Layers
Why did the colors in rainbow lab work when we
used the same materials for each color?