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3.4
Density
If you think that these lily pads
float because they are
lightweight, you are only
partially correct. The ratio of
the mass of an object to its
volume can be used to
determine whether an object
floats or sinks in water.
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Density
What is density?
Density is the amount of
matter in a given space or
the amount mass per unit
of volume.
Examples, (oil spill, italian
salad dressing etc.)
Visual
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3.4
Density
>
Determining Density
Density is the ratio of the mass of an object to
its volume.
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3.4
Density
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Determining Density
Which block has the greatest density?
What makes the 10g lead block the most
dense?
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3.4
Density
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Determining Density
Sample Densities
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3.4
Density
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Determining Density
The density of vegetable
oil is 0.93 g/cm3 and is
less than the density of
corn syrup which is 1.38
g/ml. For that reason, the
oil floats on top of the
syrup.
Water has a density of
1 g/cm3. If a substance
is less dense than water,
it floats. If a substance is
more dense than water, it
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3.4
Density
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Density and Temperature
Density and Temperature
How does a change in temperature affect
density?
Experiments show that the volume of most substances
increases as the temperature increases. Meanwhile,
the mass remains the same. Thus, the density must
change.
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Density
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Wandering Water Tank
Which color of H20 will end up on top the
red (hot) or the blue (cold) when the
dividing plate is pulled? Why?
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SAMPLE PROBLEM 3.10
3.1g (mass) / .35 cm3 (volume)
= 8.85 grams/cm3 (density)
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SAMPLE PROBLEM
What is the most dense
substance in the picture?
Why does the oil float on
top of the water?
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Practice Problems for Sample Problem 3.10
68.0 g (mass) / 6.48 cm 3 (volume)
= 1.4 g/cm3 (density)
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SAMPLE PROBLEM 3.11
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3.4 Section Quiz
1. If 50.0 mL of corn syrup have a mass of 68.7
g, the density of the corn syrup is
a. 0.737 g/mL.
b. 0.727 g/mL.
c. 1.36 g/mL.
d. 1.37 g/mL.
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3.4 Section Quiz
2. What is the volume of a pure gold coin that
has a mass of 38.6 g? The density of gold is
19.3 g/cm3.
a. 0.500 cm3
b. 2.00 cm3
c. 38.6 cm3
d. 745 cm3
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3.4 Section Quiz
3. As the temperature increases, the density of
most substances
a. increases.
b. decreases.
c. remains the same.
d. increases at first and then decreases.
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Bubbling Density Concoction
http://www.stevespanglerscience.com/lab/experi
ments/bubbling-density-concoction
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Light Ice Heavy Water
Baby Oil Density = .82 g/cm3
H20 Ice Density = .91 g/cm3
Vegetable Oil Density = .93 g/cm3
Food Coloring Density = 1.0 g/cm3
Draw the placement of substance after being
placed into the cup in random order.
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